Keyword: controls
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MOIOA03 The Challenge and Realization of the Cavity Production and Treatment in Industry for the European XFEL cavity, niobium, superconductivity, HOM 18
 
  • W. Singer, J. Iversen, A. Matheisen, H. Weise
    DESY, Hamburg, Germany
  • P. Michelato
    INFN/LASA, Segrate (MI), Italy
  
  The main effort in production of 1.3 GHz cavities for the EXFEL was dedicated to transfer the superconducting technology to the industry. These know how transfer is executed by DESY and INFN/LASA team. The preparation phase based on prototype cavities covered: qualification of potential vendors for material and cavity fabrication; work out recipe and strategy for qualification of the infrastructure for cavity surface treatment at industry; definition of the quality management strategy, documentation and electronically data exchange. Production of 800 series cavities on the principle “build to print” is contracted to companies Research Instruments and Ettore Zanon. High purity niobium and NbTi for resonators provides DESY. The principles of the material and cavities production in conformity with European Pressure Equipment Directive are developed together with the notified body. New or upgraded infrastructure has been established at both companies. The first several tens of series cavities have been produced and treated. Most of the cavities handed over to DESY up to now fulfill immediately the EXFEL specifications. The cavity production for EXFEL will be finished mid of 2015.  
slides icon Slides MOIOA03 [7.394 MB]  
 
MOIOB04 Commissioning and Operation of DC-SRF Injector SRF, cavity, LLRF, experiment 53
 
  • K.X. Liu, J.E. Chen, L.W. Feng, J.K. Hao, S. Huang, L. Lin, S.W. Quan, F. Wang, Zh.W. Wang, X.D. Wen, H.M. Xie, K. Zhao, F. Zhu
    PKU, Beijing, People's Republic of China
  
  As a new and compact injector with medium beam current, the DC-SRF injector at Peking University has been upgraded recently mainly on DC part and heat loading. With a new 20kW solid state RF power source, an improved LLRF system and related diagnostic devices on the new beam line, a series of experiments have been carried out for stably operating the DC-SRF injector at 2K temperature. The description of the system, experiment process and results will be presented.  
slides icon Slides MOIOB04 [4.992 MB]  
 
MOP011 European XFEL 3.9 GHz System cavity, linac, HOM, cryomodule 100
 
  • P. Pierini, M. Bertucci, A. Bosotti, C. Maiano, P. Michelato, L. Monaco, R. Paparella, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • C. Pagani
    Università degli Studi di Milano & INFN, Segrate, Italy
  • E. Vogel
    DESY, Hamburg, Germany
  
  The third harmonic system of the European XFEL is a joint INFN and DESY contribution to the project. Achievements, status and activity plan will be reviewed.  
 
MOP012 Completion of the Superconducting Heavy Ion Linac at Inter-University Accelerator Centre linac, operation, electronics, ion 103
 
  • A. Rai, R. Ahuja, J. Antony, S. Babu, J. Chacko, G.K. Chaudhari, A. Chaudhary, T.S. Datta, R.N. Dutt, S. Ghosh, R. Joshi, D. Kanjilal, S. Kar, J. Karmakar, M. Kumar, R. Kumar, D.S. Mathuria, R. Mehta, K.K. Mistri, A. Pandey, P. Patra, P.N. Prakash, A. Roy, J. Sacharias, B.K. Sahu, A. Sarkar, S.S.K. Sonti, S. K. Suman, J. Zacharias
    IUAC, New Delhi, India
  
  The Superconducting heavy ion Linac at Inter University Accelerator Centre (IUAC), New Delhi has been delivering accelerated ion beams to the users since 2009 *. Initially the first accelerating module, housing eight Quarter Wave Resonators (QWR’s), became operational together with the Superbuncher having one and the Rebuncher having two QWR’s, respectively. In the subsequent years, the remaining two modules have been installed and commissioned. The complete Linac was operated recently and several ion beams were delivered for scheduled experiments. The maximum energy gain was 8 MeV per charge state. Operational highlights include successful operation of four resonators in the third module with Piezo based ** mechanical tuning, implementation of remote phase locking for all resonators in three modules, development of a scheme for auto locking of resonators and testing of a capacitive pickup as a beam diagnostic element. Details will be presented vis-à-vis the problems encountered and the future course of action.
* A. Rai et. al., Proc. of SRF2009 Sept. 20–25, 2009, Berlin, Germany, page 244.
** B.K.Sahu et. al., Proc. of IPAC 2010, Kyoto Japan, page 2920. 		 
 
MOP030 Post-Production Dimensional Control of the Cold Masses and Vacuum Vessels for the XFEL Cryomodules vacuum, alignment, cryomodule, site 165
 
  • S. Barbanotti, W. Benecke, K. Jensch, M. Noak, M. Schlösser
    DESY, Hamburg, Germany
  
  The very tight alignment tolerances required in the XFEL Linac reflect in very tight tolerances for the production of the main cryomodule components. To verify the adherence to the specified tolerances of the cold masses and vacuum vessels, dimensional controls with laser tracker are performed at the production site following DESY experts’ instructions and verified at DESY with an independent measurement. We present here the measurement strategy and a summary of the results obtained so far.  
 
MOP031 Quality Control of the Vessel and Cold Mass Production for the 1.3 GHz XFEL Cryomodules vacuum, cryomodule, operation, cavity 168
 
  • S. Barbanotti, H. Hintz, K. Jensch, W. Maschmann
    DESY, Hamburg, Germany
  
  The industrial production of one hundred cold masses and vacuum vessels for the 1.3 GHz XFEL cryomodules is now fully in operation. Quality checks at the companies and controls at DESY assure the quality level required for the cryomodule assembly. Verification of the main production steps, non-destructive tests, dimensional controls are performed by DESY personnel before accepting the components. This paper resumes the quality control strategy and the results for the first components produced by the companies.  
 
MOP032 Statistic to Eddy-Current Scanning of Niobium Sheets for European XFEL niobium, cavity, survey, superconducting-RF 171
 
  • A. Brinkmann, S. Arnold, A. Ermakov, J. Iversen, M. Lengkeit, A. Poerschmann, L. Schaefer, W. Singer, X. Singer
    DESY, Hamburg, Germany
  
  The fabrication experiences of superconducting cavities for FLASH have shown that eddy-current scanning of the Nb-sheets foreseen for half-cells reduces the cavity failures. New eddy current devices have been developed and build together with the industry for the production of 800 pieces 1.3 GHz superconducting niobium cavities for European XFEL. More than 15.000 Nb-sheets provided by three companies have been tested by eddy-current scanning. The sheets that demonstrated local deviations of the signal have been subsequently non-destructively examined by 3d-microscope and X-Ray element analysis. The surface defects (dents, holes, scratches) are the mainly detected flaws. In addition several types of foreign material inclusions observed. Statistic concerning eddy-current signal deviation and rejection rates for each supplier will be presented.  
 
MOP033 Quality Assurance and Acceptance Testing of Niobium Material for Use in the Construction of the Facility for Rare Isotope Beams (FRIB) at Michigan State University (MSU) niobium, cavity, linac, SRF 174
 
  • C. Compton, D. Miller
    FRIB, East Lansing, USA
  • T.R. Bieler, D. Kang
    Michigan State University, East Lansing, USA
  • S.K. Chandrasekaran, N.T. Wright
    MSU, East Lansing, USA
  
  Funding: Work supported by US DOE Cooperative Agreement DE-SC0000661 and Michigan State University
Niobium is the current material of choice for the fabrication of superconducting radio frequency (SRF) cavities used in SRF based accelerators. Although niobium specifications for this application have been well established, material properties of as-received materials can still vary substantially. As required for the FRIB accelerator, large volumes (60,000 lbs) of niobium materials (sheet, tube, and flange) have been contracted to several niobium vendors. The FRIB cavity designs require very large niobium sheets, increasing the difficulty in fabrication and potential for contamination. FRIB has developed and initiated plans to control niobium specifications and perform incoming acceptance checks to ensure quality is maintained. Acceptance results from the first niobium shipment will be presented, looking at several production lots from the same vendor and across multiple vendors. Non-conforming results were observed and will be discussed including follow-up investigations and mitigation strategies to improve quality of future shipments. 		 
 
MOP034 The Statistics of Industrial XFEL Cavities Fabrication at E.ZANON cavity, target, niobium, accelerating-gradient 180
 
  • A. Gresele, M. Giaretta, A. Visentin
    Ettore Zanon S.p.A., Nuclear Division, Schio, Italy
  • A.A. Sulimov, J.H. Thie
    DESY, Hamburg, Germany
  
  Serial production of superconducting cavities for European-XFEL was successfully started at E.ZANON at the end of last year. The production rate (3-4 cavities a week) allows us to summarize the results and present the statistics of industrial cavity fabrication. Many parameters have been traced during different steps of cavity production. The most interesting of them, as cavity length, frequency, field flatness and eccentricity, are presented and discussed. The last results of new preparation cycles development in the frame of E-XFEL projects is also included  
 
MOP035 Using an Engineering Data Management System for Series Cavity Production for the European XFEL cavity, niobium, database, data-management 183
 
  • J. Iversen, A. Brinkmann, J.A. Dammann, A. Poerschmann, W. Singer, J.H. Thie
    DESY, Hamburg, Germany
  
  For series production of 800 superconducting cavities for the European XFEL an Engineering Data Management System (EDMS) is in use as a tool for quality control and quality assurance. DESY is responsible for “in-time” supply of more than 24000 semi-finished products of niobium and niobium-titanium alloy. The EDMS as a main repository was set up to fulfill logistic requirements and to guarantee traceability and documentation issues according to the European pressure equipment directive (PED 97/23 EC). The main aspects consist of complete paperless documentation, fully automated transfer of quality management documents and data from vendor system to DESY’s EDMS, providing to industry an access to relevant documentation and processing of release procedures for acceptance levels and non-conformity reporting. A summary of documentation methods, procedures and first experiences will be presented.  
 
MOP038 Series Production of EXFEL 1.3 GHz SRF Cavities at E. Zanon: Management, Infrastructures and Quality Control cavity, SRF, niobium, cryogenics 194
 
  • G. Massaro
    Ettore Zanon S.p.A., Nuclear Division, Schio, Italy
  • G. Corniani, M. Festa, M. Maule
    Ettore Zanon S.p.A., Schio, Italy
  
  In this paper we report on the capability of Ettore Zanon S.p.A. (EZ) to implement a EXFEL 1,3 GHz SRF cavities production system. In order to assure the series efficient repeatability of the product, this system is based on work team, composed of people with different skills, qualified infrastructures and technical procedures. A detailed study of the different work phases of the production cycle has been performed in advance, highlighting the technical difficulties and the production constraints. Based on this result, infrastructures and processes have been optimized to grant the specified quality and time/cost requirements and procedures and operating instructions, where the most complexes and delicate phases as well as the responsibilities and acceptance criteria are investigated, have been introduced. Qualification operations and eight pre-series cavities have proven EZ capability of fulfilling the imposed requirements. The above described manufacturing system allows nowadays a production rate of 4 cavities per week. EZ future developments involve minimizing time and costs while keeping the highest quality standard.  
 
MOP039 Strategy of Technology Transfer of EXFEL Preparation Technology to Industry cavity, status, hardware, linac 197
 
  • A. Matheisen, J. Iversen, A. Schmidt, W. Singer
    DESY, Hamburg, Germany
  • P. Michelato, L. Monaco
    INFN/LASA, Segrate (MI), Italy
  
  For the EXFEL a specification for the cavitiy preparation procedures (R1)was set up and handed to the industrial companies. Basing on this specification companies hard ware as well as process flows were set up. Beside this specified part of the preparation technique the companies personal needed to be educated and the processes ramped up. To check the quality of the infrastructure, status of education of personal and correct set up of process flows, so called Dummy (DCV) - , Reference (RCV ) and Pre-series (PCV) cavities were assigned. We report on the general strategy applied for the EXFEL technology transfer on cavity preparation and the results obtained on the qualification cavities.
R1) Series Surface and acceptance test preparation of superconducting cavities for the European Xfel (XFEL/A - D) JUNE 30, 2009
 		 
 
MOP040 Industrialization of European XFEL Preparation Cycle “Final EP ” at Research Instruments Company cavity, acceleration, vacuum, radiation 201
 
  • A. Matheisen, N. Krupka, M. Schalwat, A. Schmidt, M. Schmökel, W. Singer, B. van der Horst
    DESY, Hamburg, Germany
  • P. Michelato, L. Monaco
    INFN/LASA, Segrate (MI), Italy
  • M. Pekeler
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  
  In the Specification for XFEL Cavity preparation (R1) two different preparation sequences are presented. Research Instruments Company as one of the two companies contracted for XFEL cavity production and preparation has chosen the so called “final EP” cycle. Major infrastructure components like EP facility and the BCP facility were pre- qualified. This existing and the new set up areas like the cleanroom are distributed over the ground area of the industrial park Bergisch Gladbach. The process flow given in the DESY specification needed adaptation to this scenario. Additional infrastructure beside the once specified needed to be set up to ensure the same quality of processes even with a changed work flow. The general lay out of the facility, matched work flow of preparation and test results of resonators processed by RI company in their infrastructure will be reported.
(R1) Series Surface and acceptance test preparation of superconducting cavities for the European Xfel (XFEL/A - D) JUNE 30, 2009
 		 
 
MOP042 Quality Control and Processes Optimization for the EXFEL Superconducting Cavities Series Production at Ettore Zanon spa cavity, operation, vacuum, SRF 208
 
  • L. Facci, D. Rizzetto
    Ettore Zanon S.p.A., Nuclear Division, Schio, Italy
  • G. Corniani
    Ettore Zanon S.p.A., Schio, Italy
  • A. Matheisen
    DESY, Hamburg, Germany
  • P. Michelato, L. Monaco
    INFN/LASA, Segrate (MI), Italy
  
  The construction of the European XFEL forced the first mass production of Niobium bulk SRF cavities. In this context Ettore Zanon S.p.A. built a fully new facility designed to produce four fully treated and He tank equipped cavities per week, ready to be tested at DESY. The facility already reached the foreseen production rate. The guarantee of the highest quality of the resonators produced requires a very strict quality control plan. At the same time, the requirements of the industrial production in terms of time, cost and productivity must be satisfied. As a consequence processes must be standardized and working times optimized. In the following, after the description of the production facility, we would like to highlight and discuss the strategies and arrangements adopted in the various critical fields (clean room, vacuum, etc.) to ensure the foreseen results. Moreover correlation between cavities performances and production cycle parameters will be investigated and discussed.  
 
MOP043 ILC-HiGrade Cavities as a Tool of Quality Control for European XFEL cavity, radiation, feedback, framework 212
 
  • A. Navitski, E. Elsen, B. Foster, J. Iversen, A. Matheisen, D. Reschke, W. Singer, X. Singer, L. Steder, M. Wenskat
    DESY, Hamburg, Germany
  • R. Laasch, Y. Tamashevich
    University of Hamburg, Hamburg, Germany
  
  Funding: BMBF, Helmholtz Association, ILC-HiGrade, FP7 (CRISP), Alexander von Humboldt Stiftung/Foundation
The EXFEL order for SRF cavities includes 24 cavities, which are part of the ILC-HiGrade program. Initially, these cavities serve as quality control (QC) sample extracted from the EXFEL cavities series production on a regular basis. The QC and quality assurance (QA) include all processing steps of the EXFEL cavities. To maximize the information from these so-called QC cavities, a surface mapping technique is applied in a second cold RF test. There the cavities delivered have experienced identical treatment of the inner surface with the exception of mounting of the Helium vessel. After the normal acceptance test at the cavity RF measurement facility, the cavities are removed from the production flow. Further quality assurance steps beginning with a detailed RF test with surface mapping followed by a high resolution optical inspection (OBACHT) are carried out to improve the understanding of defects in close collaboration with the standing experts engaged in the EXFEL production. Results of the first QC cavities tests as well as planned further R&D will be presented and discussed. 		 
 
MOP045 Electropolishing for EXFEL Cavities Production at Ettore Zanon SpA cavity, niobium, cathode, superconductivity 220
 
  • M. Rizzi
    Ettore Zanon S.p.A., Schio, Italy
  • A. Gresele
    Ettore Zanon S.p.A., Nuclear Division, Schio, Italy
  • A. Matheisen, N. Steinhau Kühl
    DESY, Hamburg, Germany
  • P. Michelato
    INFN/LASA, Segrate (MI), Italy
  
  A new horizontal electropolishing (EP) facility has been implemented by Ettore Zanon SpA for the series production of the EXFEL cavities produced by the company. According to EXFEL specification a bulk EP of at least 100 micron is the first step of the surface treatment for high performances. Particular attention has been dedicated to find the best configuration during qualification of the system. Correlation between process variables, RF tests at room temperature at Zanon and vertical RF tests at 2 K at DESY have been investigated and the Niobium removal optimized. The facility has been designed for industrial scope, in order to guarantee the required quality and production rate of 4 cavities per week. One of the most important aspects has been the system automation to have complete control of the process.  
 
MOP047 Set up of Production Line for EXFEL Beam Position Monitor and Quadrupol Units for Cavity String Assembly at CEA vacuum, alignment, quadrupole, status 224
 
  • M. Schalwat, M. Koepke, A. Matheisen, H. Weitkämper
    DESY, Hamburg, Germany
  
  The super conducting (s.c.) accelerator models of the EXFEL consist of eight s.c. resonators, one s.c. quadrupol magnet and one beam position monitor. These components are connected inside ISO 4 cleanroom at CEA Saclay to a so called cavity string under the guidance of the XFEL WP 09 activities. The eight s.c. cavities are handed from DESY to CEA for string assembly after successful RF test. The beam- position monitor and Quadrupol units (BQU) are assembled and cleaned in the DESY cleanroom at DESY Hamburg to the same standard’s of cleanliness as requested for s.c. Cavities. The completed BQU units are handed over to CEA IRFU / WP 9 in “ready for installation to cavity string“ status. The setup of infrastructure, the qualification of processes and transport as well as the ramp up to a delivery rate of 1 BQU per week will be presented.  
 
MOP048 PED Requirements Applied to the Cavity and Helium Tank Manufacturing cavity, niobium, linac, operation 227
 
  • A. Schmidt, J. Iversen, A. Matheisen, W. Singer
    DESY, Hamburg, Germany
  
  For the European XFEL more than 800 Cavities are manufactured by industrial partners. Each cavity is housed in an individual cryo vessel, the so called helium tank. All vessels are made from titanium and manufactured by industry as well. The cavity, welded into its helium tank, is a pressure loaded part and has to follow the pressure equipment directive - PED (97/23/EC). Setting up a series production of cavities and helium tanks by different vendors according given standards, was the task of the EXFEL WPG-1 LINAC-WP04. In cooperation with the TUEV-Nord as the notified body, DESY is responsible for the qualification of design, material in use and reasonable tests to get a certificate for pressure bearing parts.  
 
MOP049 Progress and Experiences of Series Production of Helium Tanks With DESY as a Subcontractor for RI cavity, status, factory, data-management 231
 
  • A. Schmidt, J.A. Dammann, A. Daniel, A. Matheisen
    DESY, Hamburg, Germany
  
  DESY acts as a subcontractor for helium tanks, for one of the cavity manufacturer in charge, for the EXFEL cavity production. Here the full responsibility of production, quality and warranty of these parts is at DESY. Therefore on 400 out of the total of 800 helium tanks, DESY has to set up a logistic of incoming inspection, documentation, storage and distribution. Special effort is made to archive a free of doubts interconnection and integration of the cavity into the helium tank. After more than 300 units produced a review and statistic is provided.  
 
MOP051 The Statistics of Industrial XFEL Cavities Fabrication at Research Instruments cavity, target, status, vacuum 234
 
  • A.A. Sulimov, J.H. Thie
    DESY, Hamburg, Germany
  • M. Pekeler, D. Trompetter
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  
  Serial production of superconducting cavities for European-XFEL was successfully started at Research Instrument (RI) at the end of last year. The production rate (3-4 cavities a week) allows us to summarize the results and present the statistics of industrial cavity fabrication. Many parameters have been traced during different steps of cavity production. The most interesting of them, as cavity length, frequency, field flatness and eccentricity, are presented and discussed.  
poster icon Poster MOP051 [0.769 MB]  
 
MOP052 RF Aspects of Quality Control for Industrial XFEL Cavities Fabrication cavity, background, SRF, pick-up 237
 
  • A.A. Sulimov, V. Gubarev, S. Yasar
    DESY, Hamburg, Germany
  
  Quality control of XFEL serial cavities allows us not only except the using of reject cavities for linac, but also give a feedback to the industry in case of cavity parameters come to their limits. RF control assays not only the electro dynamical characteristics (as frequencies, Q-factors and fields), but also provide the mechanical revise with a very high accuracy. Automation of this quality control in XFEL data base gave us a powerful tool which is required for the big projects as European-XFEL.  
poster icon Poster MOP052 [1.178 MB]  
 
MOP053 R&D on Cavity Treatments at DESY Towards the ILC Performance Goal cavity, SRF, factory, linear-collider 240
 
  • A. Navitski, E. Elsen, B. Foster, D. Reschke, J. Schaffran, W. Singer, X. Singer
    DESY, Hamburg, Germany
  • R. Laasch, Y. Tamashevich
    University of Hamburg, Hamburg, Germany
  
  Funding: BMBF, Helmholtz Association, ILC-HiGrade, FP7 (CRISP), Alexander von Humboldt Stiftung/Foundation
The actual R&D program at DESY is derived from the global effort for the International Linear Collider (ILC) and is well in phase with effort elsewhere. The program aims at a solid understanding and control of the industrial mass-production process of the superconducting radio-frequency accelerating cavities, which are manufactured for the European X-ray Free Electron Laser (EXFEL) at DESY. The goal is to identify the gradient limiting factors and further refine the cavity treatment technique to provide gradients above 35 MV/m at >90% production yield. Techniques such as 2nd sound quench detection, OBACHT optical inspections, defect metrology using silicon replica as well as Centrifugal Barrel Polishing (CBP) and Local Grinding repair are foreseen as tools. Actual status, details, and first achievements of the program will be reported. 		 
 
MOP068 NGLS Linac Design cryomodule, linac, cavity, cryogenics 286
 
  • R.P. Wells, J.M. Byrd, J.N. Corlett, L.R. Doolittle, P. Emma, A. Ratti
    LBNL, Berkeley, California, USA
  • C. Adolphsen, C.D. Nantista
    SLAC, Menlo Park, California, USA
  • D. Arenius
    JLAB, Newport News, Virginia, USA
  • C.M. Ginsburg, T.J. Peterson
    Fermilab, Batavia, USA
  
  Funding: Work supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231
The Next Generation Light Source (NGLS) is a design concept for a multibeamline soft x-ray FEL array powered by a CW superconducting linear accelerator, operating with a 1 MHz bunch repetition rate. This paper describes the concepts for the cavity and cryostat design operating at 1.3 GHZ and based on minimal modifications to the design of ILC cryomodules, This leverages the extensive experience derived from R&D that resulted in the ILC design. Due to the different nature of the two applications, particular attention is given now to high loaded Q operation and microphonics control, as well as high reliability and expected up time. The work describes the design and configuration of the linac, including choice of gradient, possible modes of operation, cavity design and RF power, as well as the consequent requirements for the cryogenic system. 		 
 
MOP078 Horizontal Testing of a Dressed Deflecting Mode Cavity for the APS Upgrade Short Pulse X-Ray Project cavity, operation, photon, vacuum 321
 
  • J.P. Holzbauer, N.D. Arnold, T.G. Berenc, D.J. Bromberek, J. Carwardine, N.P. Di Monte, J.D. Fuerst, A.E. Grelick, D. Horan, J.A. Kaluzny, J.W. Lang, H. Ma, T.L. Mann, D.A. Meyer, M.E. Middendorf, A. Nassiri, Y. Shiroyanagi, J.H. Vacca, G.J. Waldschmidt, R.D. Wright, G. Wu, Y. Yang, A. Zholents
    ANL, Argonne, USA
  • E.R. Harms, W. Schappert
    Fermilab, Batavia, USA
  • J.D. Mammosser
    JLAB, Newport News, Virginia, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CHI1357.
The short pulse x-ray (SPX) part of the Advanced Photon Source (APS) Upgrade is an effort to enhance time-resolved experiments on a few-ps-scale at the APS. The goal of SPX is the generation of short pulses of x-rays for pump-probe time-resolved capability using superconducting rf (SRF) deflecting cavities*. These cavities will create a correlation between longitudinal position in the electron bunch and vertical momentum**. The light produced by this bunch can be passed through a slit to produce a pulse of light much shorter (1-2 ps instead of 100 ps) than the bunch length at reduced flux. An SPX cavity has been tested with a helium vessel and tuner. In addition to studying rf performance with more realistic cooling, this test allowed integration and operation of many systems designed for SPX cryomodule in-ring operation. These systems included an APS-constructed 5 kW, 2.815 GHz amplifier, a digital low-level rf controller system designed and fabricated in collaboration with LBNL, a cavity tuner, and instrumentation systems designed for the existing APS infrastructure. Cavity performance and subsystem performance will be reported and discussed in this paper.
* A. Zholents et al., NIM A 425, 385 (1999).
** A. Nassiri et al., “Status of the Short-Pulse X-Ray Project at the Advanced Photon Source,” IPAC 2012, New Orleans, LA, May 2012.
 
 
MOP079 Design and Test of a Cryogenic Seal for Rectangular Waveguide Using VATSEAL Technology vacuum, cryogenics, superconducting-RF, detector 325
 
  • J.D. Fuerst, J.P. Holzbauer, J.A. Kaluzny, C.R. Montiel, Y. Shiroyanagi, B.K. Stillwell
    ANL, Argonne, USA
  
  Funding: This work was supported by the U. S. Department of Energy, Office of Science, under contract No. DE-AC02-06CH11357.
A commercially available rectangular metal seal from VAT Vacuum Valves AG has been evaluated and cold tested as a possible cryogenic seal for srf cavities. A program of analysis and cryogenic testing was undertaken to evaluate seal parameters and suitability. Seal line loads, bolt torque and resultant flange/seal deformation at low temperature and during thermal cycling were calculated both statically and via time-dependent numerical simulation to confirm the mechanical integrity of the flange/seal system. Cold testing of flange/waveguide assemblies included thermal shocks in liquid nitrogen and realistic cool-downs below the λ point. Acceptable seal performance has been demonstrated under all test conditions although seal joint assembly is sensitive to details including bolt torque, flange flatness, and surface finish. 		 
 
MOP083 Operational Experience With the SOLEIL Storage Ring RF Cryogenic Plant cryogenics, operation, cavity, HOM 337
 
  • M. Louvet, H.D. Dias, M. Diop, P. Marchand
    SOLEIL, Gif-sur-Yvette, France
  
  In the Storage Ring of the Synchrotron SOLEIL light source, two cryomodules provide the required power of 575 kW at the nominal energy of 2.75 GeV with the full beam current of 500 mA and all the insertion devices. Each cryomodule contains a pair of 352 MHz superconducting cavities (Nb/Cu), cooled in a bath of liquid helium at 4.5 K. A single 350 W cryogenic system supplies the liquid helium for the two cryomodules. The seven years of operational experience with this cryogenic plant as well as its upgrades are reported.  
 
TUIOC02 Bipolar EP: Electropolishing without Fluorine in a Water Based Electrolyte cavity, niobium, SRF, experiment 404
 
  • A.M. Rowe, A. Grassellino
    Fermilab, Batavia, USA
  • T.D. Hall, M.E. Inman, S.T. Snyder, E.J. Taylor
    Faraday Technology, Inc., Clayton, USA
  
  Funding: Operated by Fermi Research Alliance, LLC under contract No. De-AC02-07CH11359 with the United States Department of Energy
For more than thirty years, preparing superconducting RF cavities for high performance has required the use of dangerous and ecologically damaging chemicals. Reducing the personnel and environmental risks associated with using these chemicals is a priority at Fermilab. Therefore, Fermilab pursued a project to adapt a non-hazardous and relatively benign bipolar electropolishing technique to SRF cavities that Faraday Technology, Inc. developed. Faraday initially developed this electropolishing technique to polish metal alloys used in automotive and semiconductor components as well as medical devices and implants. By modifying the cathodic/anodic interaction via a pulse forward/pulse reverse technique, Fermilab and Faraday Technology demonstrate the capability to polish 1.3 GHz single-cell cavities utilizing an aqueous 10% sulfuric acid electrolyte. We present the development of bipolar EP for single-cell 1.3 GHz cavities and show the results from vertical tests achieving gradients greater than 40 MV/m. 		 
slides icon Slides TUIOC02 [1.251 MB]  
 
TUP037 Dynamic Hardening Rule; a Generalization of the Classical Hardening Rule for Crystal Plasticity experiment, simulation, SRF, niobium 499
 
  • A. Mapar, F. Pourboghrat
    MSU, East Lansing, USA
  • T.R. Bieler
    Michigan State University, East Lansing, USA
  • C. Compton
    FRIB, East Lansing, Michigan, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, through Grant No. DE-S0004222.
The mechanical properties of a niobium (Nb) specimen can change with the orientation of the sheet. This anisotropy causes inhomogeneity in manufactured SRF cavities. Large grain Nb sheets are more anisotropic and less expensive than fine grain sheets. Designing a manufacturing process for large grain Nb sheets, however, is extremely complex, and requires using advance modeling techniques. A model capable of accurately predicting the deformation behavior of Nb can help improve the performance and reduce costs of a SRF cavity. Optimal design of the manufacturing of cavities with tube hydroforming process is possible with such a model. Crystal plasticity modeling of FCC materials has been very successful; however, there is still no model that can accurately predict the deformation behavior of BCC materials like the large grain Nb sheet. In this study, authors have proposed a dynamic hardening rule for crystal plasticity that significantly improves predictions of the model for large grain Nb. This model is the generalization of the classical hardening rule, and gives better control over the hardening rate. It also increases the stability of the model. 		 
 
TUP054 Electropolishing of Niobium SRF Cavities in Low Viscosity Aqueous Electrolytes Without Hydrofluoric Acid cavity, niobium, SRF, experiment 540
 
  • E.J. Taylor, T.D. Hall, M.E. Inman, S.T. Snyder
    Faraday Technology, Inc., Clayton, USA
  • A.M. Rowe
    Fermilab, Batavia, USA
  
  Funding: U.S. DOE Purchase order No. 594128
Electropolishing of niobium materials and cavities is conventionally conducted in high viscosity electrolytes consisting of concentrated sulfuric and hydrofluoric acid. The use of these dangerous and ecologically damaging chemicals requires careful attention to safety protocol to avoid harmful worker exposure and environmental damage. In this poster we present an approach based on bipolar voltage fields enabling the use of low viscosity water based electrolytes without hydrofluoric acid for electropolishing of niobium materials. The subtleties of the bipolar electropolishing process vis-a-vis conventional electropolishing will be presented. 		 
 
TUP056 Industrialization of European XFEL Preparation Cycle “BCP Flash” at Ettore Zanon Company cavity, vacuum, acceleration, pick-up 547
 
  • A. Matheisen, N. Krupka, M. Schalwat, A. Schmidt, W. Singer, N. Steinhau Kühl, B. van der Horst
    DESY, Hamburg, Germany
  • G. Corniani
    Ettore Zanon S.p.A., Schio, Italy
  • P. Michelato, L. Monaco
    INFN/LASA, Segrate (MI), Italy
  
  In the Specification for XFEL Cavity preparation (R1) two different preparation sequences are presented. Ettore Zanon Company as one of the two companies contracted for XFEL cavity production and preparation has chosen the so called BCP flash cycle. To fulfill the requested work flow and quality of infrastructure and processes, the company set up a complete new infrastructure in refurbished fabrication halls. The layout of the facility, set up of work flow of preparation and test results of resonators processed by E.Zanon in their infrastructure will be reported.
(R1) Series Surface and acceptance test preparation of superconducting cavities for the European Xfel (XFEL/A - D) JUNE 30, 2009
 		 
 
TUP071 Development of Nb3Sn Cavity Vapor Diffusion Deposition System niobium, cavity, vacuum, impedance 603
 
  • G.V. Eremeev, W.A. Clemens, K. Macha, H. Park, R.S. Williams
    JLAB, Newport News, Virginia, USA
  • H. Park
    ODU, Norfolk, Virginia, USA
  
  Funding: Work supported by DOE. Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
Alternative BCS superconductors with the superconducting critical temperature higher than that of niobium theoretically surpass the limitations of niobium. The feasibility of technology has been demonstrated at 1.5 GHz with Nb3Sn vapor deposition technique at Wuppertal University. The benefit at these frequencies is more pronounced at 4.2 K, where Nb3Sn coated cavities show RF resistances an order of magnitude lower than that of niobium. At Jefferson Lab we started the development of Nb3Sn vapor diffusion deposition system within an R&D development program towards compact light sources. Here we present the current progress of the system development. 		 
 
TUP081 Chemical Vapor Deposition Techniques for the Multilayer Coating of Superconducting RF Cavities niobium, cavity, SRF, experiment 635
 
  • F. Weiss, C. Jimenez, S. Pignard
    Institut Polytechnique de Grenoble, Grenoble INP, Grenoble, France
  • C.Z. Antoine
    CEA/IRFU, Gif-sur-Yvette, France
  • M. Benz, E. Blanquet, R. Boichot, A. Mantoux, F. Mercier
    Laboratoire SIMAP, Grenoble-INP, CNRS, UJF, Saint Martin d'Hères, France
  
  Issued from the recent development of thin films technologies, multilayer nanostructures face today very challenging questions in materials science: ultimate size reduction, process control at an atomic scale, new size driven properties and system characterisation. For superconducting RF technologies a significant breakthrough could arise from the use of multilayered structures deposited inside Nb cavities. These multilayer nanostructures are based on the use of some 10 nanometers thick superconducting layers (d<λL) with a higher Tc than in Nb, alternating with insulating layers, required to decouple the superconducting films. We present here our first studies devoted to nano-layered superconductors produced by Chemical Deposition techniques: CVD and ALD. The basic principles of CVD and ALD will be presented together with new developments of the coordination chemistry for the ALD precursors, which is key point for the optimization of the individual layers. First results concerning NbN films obtained by CVD as well as CVD and ALD results concerning insulating materials used for Superconducting/insulating (S/I/S/I) multilayers structures will be reported.  
 
TUP093 Field Emitter Current Conditioning on Nb Single Crystals with Different Roughness due to Varying EP/BCP Ratio site, gun, ion, damping 686
 
  • S. Lagotzky, G. Müller
    Bergische Universität Wuppertal, Wuppertal, Germany
  • P. Kneisel
    JLAB, Newport News, Virginia, USA
  
  Funding: Funding by the BMBF project 05H12PX6
Enhanced field emission (EFE) from particulate contaminations and surface irregularities is one of the main field limitations of the superconducting Nb cavities required for XFEL and ILC. While the number density of particulate emitters can be reduced by dry ice cleaning (DIC) and clean room assembly, the optimum choice of crystallinity and polishing are still under discussion [1]. For the future ILC cavities, large or even single crystal Nb with a combination of BCP and EP is considered. Therefore, we have systematically investigated the EFE of single crystal Nb samples which got the same total polishing depth 136-138 μm but a different EP/BCP ratio (5.80, 2.40, 0.73, 0.15) and DIC by means of correlated optical/AFM profilometry, field emission scaning microscopy (FESM) and high-resolution SEM. Depending on the surface roughness (Ra < 200 nm), field enhancement factors b of 12 – 42 and emitting areas S up to 0.1 μm² were obtained. High current conditioning (μA - mA) of these emitters usually resulted in a slight reduction of b (factor < 2) but a strong increase of S. The influence of the surface roughness on the EFE and conditioning of the remaining emitters will be discussed.
[1] Reschke et al., Phys. Rev. ST Accel. Beams 13, 071001-1 (2010) 		 
 
TUP108 Study on Niobium Scratch and Tantalum or Carbonaceous Contamination at Niobium Surface with Field Emission Scanner niobium, cavity, electron, site 731
 
  • S. Kato, H. Hayano, T. Kubo, T. Noguchi, T. Saeki, M. Sawabe
    KEK, Ibaraki, Japan
  
  It is mandatory to investigate field emission from niobium SRF cavity surface systematically since even small field emission often limits the cavity performance terribly. The field emission strength and the number of emission sites strongly depend on niobium surface properties which are determined by its surface treatment and handling. It was found that carbonaceous contamination including carbon, oxygen, sometimes, nitrogen often segregates at CPed or EPed surface with a size of several micron to several tens of micron-meters. There is a strong doubt that this contamination causes field emission from the surface. Newly developed field emission scanner (FES) allows us to measure a distribution of the field emitting sites over a sample surface at a given field strength along with its SEM (scanning electron microscope) observation and EDX (energy dispersive x-ray) analysis. This article describes results of the FES-SEM-EDX application to carbonaceous contamination at niobium surface.  
 
TUP111 Experimental Investigations of the Quench Phenomena for the Quench Localization by the Second Sound Wave Method cavity, SRF, niobium, experiment 739
 
  • J. Plouin, J.-P. Charrier, C. Magne, J. Novo
    CEA/DSM/IRFU, France
  • L. Maurice
    CEA/IRFU, Gif-sur-Yvette, France
  
  The quench localization by the second sound method is now widely used in many laboratories. This method avoids the complicated implementation of temperature arrays around the surface cavities. Instead, specific sensors are placed around the cavity and the time of arrival of the second sound wave generated by the quench is measured on each sensor; then the distance from sensors to quench is deducted from the theoretical second sound wave velocity. In principle, the quench position can be localized with a triangulation by a limited number of sensors. However, many measurements have shown that the time of arrival of the wave was not corresponding to the theoretical second sound wave velocity: the “measured” velocity is often 50% higher than the theory. At CEA-Saclay we performed several measurements on single cell cavities to investigate these phenomena. Several hypotheses are studied: large quench spot, heat propagation by another phenomenon than the second sound near to the cavity where the heat power density is very high. These results and the discussions on these hypotheses will be presented.  
 
WEIOB01 Status of MgB2 Coating Studies for SRF Applications cavity, SRF, background, superconductivity 777
 
  • T. Tajima, L. Civale, D.J. Devlin, G.C. Martinez, R.K. Schulze
    LANL, Los Alamos, New Mexico, USA
  
  Funding: DOE Office of Science/Nuclear Physics
MgB2 has shown promising results on small samples and its coating development is entering into the stage to coat large samples and elliptical cavities. Several coating techniques that seem to be appropriate for cavity coating and their status will be shown together with some cavity measurement results with either 6 GHz or 1.3 GHz single-cell cavities. Other data such as RF surface resistance at low temperatures and vortex penetration fields with small samples will also be shown. 		 
slides icon Slides WEIOB01 [2.183 MB]  
 
THIOA01 Infrastructure, Methods and Test Results for the Testing of 800 Series Cavities for the European XFEL cavity, coupling, operation, feedback 812
 
  • D. Reschke
    DESY, Hamburg, Germany
  
  Funding: The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no 283745 (CRISP).
The main linac of the European XFEL will consist of 100 accelerator modules, i.e. 800 superconducting accelerator cavities operated at a design gradient of 23.6 MV/m. The fabrication and surface preparation of the cavities in industry is in full swing. This talk describes the infrastructure and procedures of the vertical acceptance test in the "Accelerator Module Test Facility AMTF" at DESY. The present status of the test results is given. 		 
slides icon Slides THIOA01 [1.998 MB]  
 
THIOA02 The Challenge to Assemble 100 Cryomodules for the European E-XFEL cryomodule, cavity, vacuum, linac 816
 
  • C. Madec
    CEA, Gif-sur-Yvette, France
  • S. Berry, J.-P. Charrier, M. Fontaine, Y. Gasser, O. Napoly, C.S. Simon, T.V. Vacher, B. Visentin
    CEA/DSM/IRFU, France
  • P. Charon, C. Cloué, G. Monnereau, J.L. Perrin, D. Roudier, Y. Sauce, T. Trublet
    CEA/IRFU, Gif-sur-Yvette, France
  
  As In-Kind contributor to the E-XFEL project, CEA is committed to the integration on the Saclay site of the 100 cryomodules (CM) of the superconducting linac as well as to the procurement of miscellaneous parts including 31 cold beam position monitors (BPM) of the re-entrant type. The assembly infrastructure has been renovated from the previous Saturne Synchrotron Laboratory facility: it includes a 200 m2 clean room complex with 112 m2 under ISO4, 1325 m2 of assembly platforms and 400 m2 of storage area. In parallel, CEA has conducted industrial studies and three cryomodule assembly prototyping both aiming at preparing the industrial file, the quality management system and the commissioning of the assembly plant, tooling and control equipment. In 2012, the contract of the integration has been awarded to ALSYOM. The first pre-series modules have been assembled and are being tested at DESY. This paper will present the challenges of the module integration from the preparation phase to the industrial phase.  
slides icon Slides THIOA02 [17.641 MB]  
 
THIOB01 CEBAF Upgrade: Cryomodule Performance and Lessons Learned cryomodule, cavity, linac, vacuum 836
 
  • M.A. Drury, J. Hogan, C. Hovater, L.K. King, H. Park, J.P. Preble, R.A. Rimmer, H. Wang, M. Wiseman
    JLAB, Newport News, Virginia, USA
  • G.K. Davis, C.E. Reece
    JLab, Newport News, Virginia, USA
  • F. Marhauser
    Muons, Inc, Illinois, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract DE-AC05-06OR23177.
The Thomas Jefferson National Accelerator Facility is currently engaged in the 12 GeV Upgrade Project. The goal of the 12 GeV Upgrade is a doubling of the available beam energy of the Continuous Electron Beam Accelerator Facility (CEBAF) from 6 GeV to 12 GeV. The increase in beam energy will largely be due to the addition of ten C100 cryomodules and the associated RF in the CEBAF linacs. These cryomodules are designed to deliver 100 MeV per cryomodule. Each C100 cryomodule contains a string of eight seven-cell, electro-polished, superconducting RF cavities. While an average performance of 100 MV is needed to achieve the overall 12 GeV beam energy goal, the actual performance goal for the cryomodules is an average energy gain of 108 MV to provide operational headroom. All ten of the C100 cryomodules are installed in the linac tunnels and are on schedule to be commissioned by September 2013. Commissioned performance has ranged from 104 MV to 118 MV. In May, 2012, a test of an early C100 achieved 108 MV with full beam loading. This paper will discuss the performance of the C100 cryomodules along with operational challenges and lessons learned for future designs.
The U.S. Govt. retains a non-exclusive, paid-up,irrevocable,world-wide license to publish or reproduce this manuscript. 		 
slides icon Slides THIOB01 [2.534 MB]  
 
THIOC04 Demonstration of RF Stabilities in STF 9-cell Cavities Aiming for the Near Quench Limit Operation operation, cavity, feedback, LLRF 865
 
  • M. Omet
    Sokendai, Ibaraki, Japan
  • T. Matsumoto, S. Michizono, T. Miura
    KEK, Ibaraki, Japan
  
  In preparation of ILC an operation of two superconducting cavities controlled by digital LLRF techniques at different gradients (16 MV/m, 24 MV/m) with flat flattops and a 6.4 mA beam was demonstrated, which is only possible by PkQL control (individual setting of driving power and loaded Q per cavity). The vector sum stabilities were ΔA/A = 0.009%rms and Δφ = 0.009°rms. Since in ILC the cavity gradient spread is large (31.5 MV/m±20%) the required range of loaded Q values is 3·106 to 107. High loaded Q operation with a 6.1 mA beam at 2·107 was demonstrated. The stabilities were ΔA/A = 0.008%rms and Δφ = 0.014°rms. Furthermore a near klystron operation within 5% of saturation was performed with a 6.2 mA beam. The stabilities were ΔA/A = 0.010%rms and Δφ = 0.009°rms.  
slides icon Slides THIOC04 [1.448 MB]  
 
THP007 Cornell's ERL Cavity Production cavity, target, linac, cryomodule 909
 
  • R.G. Eichhorn, B. Bullock, B. Clasby, B. Elmore, F. Furuta, G.H. Hoffstaetter, J.J. Kaufman, B.M. Kilpatrick, J. Sears, V.D. Shemelin
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • T. Kürzeder
    TU Darmstadt, Darmstadt, Germany
  
  The phase 1 R&D program launched in preparation to building a 5 GeV Energy Recovery Linac (ERL) at Cornell, a full main linac cryomodule is currently built, housing six 7-cell cavities. In order to control the beam break-up limit, the shape of the cavity was highly optimized and stringent tolerances on the cavity production were targeted. We will report on the details of the cavity production, the accuracy of the cups forming the individual cells, the trimming procedure for the dumbbells, the cavity tuning and final accuracy of the cavity concerning field flatness, resonant frequency and overall length within this small series production.  
 
THP053 Development of Quality Control Procedures for the Processing of ReA3 Copper Plated Fundamental Power Coupler cavity, detector, SRF, operation 1031
 
  • R. Oweiss, J.L. Crisp, A. Facco, M. Leitner, D. Morris, J. Popielarski
    FRIB, East Lansing, Michigan, USA
  • A. Facco
    INFN/LNL, Legnaro (PD), Italy
  • L. Popielarski, J. Wenstrom
    NSCL, East Lansing, Michigan, USA
  
  The processing of copper plated fundamental power couplers (FPCs) has posed major risks to the successful performance of superconducting cavities. This paper discusses the lessons learnt throughout the development of quality control procedures for the ReA3 copper plated FPCs. Michigan State University (MSU) Re-Accelerator project (ReA3) utilizes eight copper plated coaxial FPCs to power the 80.5 MHz=0.085 quarter-wave resonators (QWRs) for which baseline quality control procedures are established. The effectiveness of visual inspection process using the microscope & borescope to qualify FPC components is evaluated. The adaptive use of quality control diagnostic devices as the liquid particle counter, surface particle detector & desiccator for the clean processing & assembly is assessed. A summary of the collaborative work to refine and optimize FPC design & processing in correlation to cavity performance and experimental results is presented.
*This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661.
 		 
 
THP054 Last Spiral 2 Couplers Preparation and RF Conditioning vacuum, cryomodule, multipactoring, cavity 1036
 
  • Y. Gómez Martínez, M.A. Baylac, P. Boge, T. Cabanel, P. De Lamberterie, M. Marton, R. Micoud
    LPSC, Grenoble Cedex, France
  
  Six crymodules are ready to be installed in the SPIRAL 2 LINAC. We present here the protocols used for the preparation and for the RF conditioning of the couplers and the obtained results.  
 
THP056 Validation Procedures for the IFMIF Power Coupler Prototypes operation, vacuum, target, linac 1043
 
  • H. Jenhani, P. Carbonnier, Y. Gasser, N. Grouas, P. Hardy, V.M. Hennion, F. Orsini, Y. Penichot, B. Renard, D. Roudier
    CEA/IRFU, Gif-sur-Yvette, France
  • S.J. Einarson, T.A. Treado
    CPI, Beverley, Massachusetts, USA
  • D. Regidor, M. Weber
    CIEMAT, Madrid, Spain
  
  In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, a Linear IFMIF Prototype Accelerator (LIPAc) is presently under design for the first phase of the project. The first two IFMIF Power Coupler Prototypes were manufactured for LIPAc. Series of acceptance tests have been performed successfully. Prototype Power Couplers have been then cleaned and assembled in an ISO 5 cleanroom. A dedicated test bench allowing RF conditioning of the couplers up to 200 kW CW at 175 MHz was achieved. RF power conditioning is planned to start during October 2013.  
 
THP067 Testing of Copper Plating Quality on ReA3 Coupler Bellows and Approach to Improved Plating for FRIB Production vacuum, SRF, experiment, cavity 1077
 
  • L. Popielarski, M. Goodrich, M. Hodek, I.M. Malloch, N.M. Nicholas, R. Oweiss, J. Popielarski, N. Putnam, K. Saito, D.R. Victory
    FRIB, East Lansing, Michigan, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661.
The SRF community faces difficulties finding repeatable, quality copper plating for fundamental power coupler (FPC) components. The copper plating of ten small custom bellows of β=0.085 Quarter-Wave Resonator (QWR) variable couplers for the ReAccelerator project has presented technical challenges. An improvement plan has been established and includes: better defining plating requirements and specification, creating testing processes to assure plating quality (Acceptance Criteria Listing (ACL)), identify viable plating vendors, develop clean, robust plating fixtures, procedures and quality assurance steps with multiple vendors, and perform ACL testing on plated bellows. A total of 24 prototype and production plated bellows are analyzed through acceptance testing, which include a vacuum leak check, tape test, 1000 psi water rinse, thermal cycle at 77K, borescope inspection and final leak check. Select bellows have been processed and tested with a quarter-wave resonator. A summary of the plating improvement program, plated bellows acceptance statistics, and RF test results will be reported. 		 
 
THP079 Improvement of the Pneumatic Frequency Tuner of the Superconducting Resonators at IUAC linac, cavity, vacuum, feedback 1107
 
  • A. Pandey, G.K. Chaudhari, R.N. Dutt, S. Ghosh, D. Kanjilal, J. Karmakar, D.S. Mathuria, P. Patra, A. Rai, A. Roy, B.K. Sahu, S.K. Saini
    IUAC, New Delhi, India
  
  The existing phase locking scheme of the quarter wave resonators used in superconducting linear accelerator of Inter University Accelerator Centre consists of a fast (electronic) and a slow time scale (pneumatic) control. Presently, helium gas operated mechanical tuners are being used to phase lock the resonators against the master oscillator frequency and different ion beams have been accelerated and delivered to conduct experiments. The present pneumatic frequency tuner has two limitations: (a) no proportional flow control in vacuum condition (b) large hysteresis problem in the proportional valve responsible for gas flow control. Due to these limitations, the system becomes non-linear and the response time is very slow (~sec). Using the existing system, phase locking of a resonator becomes delicate and time consuming. In addition, it was found to be difficult to implement auto phase locking mechanism on the resonator. To overcome these problems and to improve the dynamics of the existing tuner, a new pneumatic tuning system has been adopted. Details of the existing tuning mechanism and the modified tuning system along with the test results will be presented in the paper.  
 
THP081 Development of a Slow Tuner for the 162.5 MHz Superconducting Half-Wave Resonator in IMP cavity, cryomodule, low-level-rf, feedback 1115
 
  • S. He, Y. He, Y.L. Huang, L.B. Liu, F.F. Wang, R.X. Wang, X.W. Wang, W.M. Yue, S.H. Zhang, H.W. Zhao
    IMP, Lanzhou, People's Republic of China
  
  Funding: This work is supported by Strategic Priority Research Program of CAS (XDA0302)and National Natural Science Foundation of China (91026004)
Within the framework of the C-ADS project, IMP has proposed a 162.5MHz HWR Superconducting cavity for low energy section(β=0.09) of high power proton linear accelerators. A compact slow tuner has been developed for final tuning of the resonance frequency of the cavity after cooling down to operating temperature and to compensate microphonics and Lorentz force detuning. The slow tuner is driven by an external stepper motor and gear box for coarse cavity adjustment. To reduce the force requirements of the actuator, a lever arm and scissor jack mechanism have been applied. The tuner design and recent results of warm tests as the first prototype are presented. 		 
 
THP084 The Tuning System for the HIE-ISOLDE High-Beta Quarter Wave Resonator cavity, simulation, niobium, LLRF 1121
 
  • P. Zhang, L. Alberty, L. Arnaudon, K. Artoos, S. Calatroni, O. Capatina, A. D'Elia, Y. Kadi, I. Mondino, T. Renaglia, D. Valuch, W. Venturini Delsolaro
    CERN, Geneva, Switzerland
  • A. D'Elia
    UMAN, Manchester, United Kingdom
  
  Funding: Work supported in part by a Marie Curie Early Initial Training Network Fellowship of the European Community's 7th Programme under contract number PITN-GA-2010-264330-CATHI.
A new linac using superconducting quarter-wave resonators (QWR) is under construction at CERN in the framework of the HIE-ISOLDE project. The QWRs are made by Niobium sputtered on a bulk Copper substrate. The working frequency at 4.5 K is 101.28 MHz and they will provide 6 MV/m accelerating gradient on the beam axis with a total maximum power dissipation of 10 W on cavity walls. A tuning system is required in order to both minimize the forward power variation in beam operation and to compensate the unavoidable uncertainties in the frequency shift during the cool-down process. The tuning system has to fulfill a complex combination of RF, structural and thermal requirements. The paper presents the functional specifications and details the tuning system RF and mechanical design and simulations. The results of the tests performed on a prototype system are discussed and the industrialization strategy is presented in view of final production. 		 
 
THP085 Equipping FLASH with MTCA.4-based LLRF System LLRF, cryomodule, cavity, feedback 1126
 
  • J. Branlard, V. Ayvazyan, L. Butkowski, M.K. Grecki, M. Hoffmann, F. Ludwig, U. Mavrič, S. Pfeiffer, K.P. Przygoda, H. Schlarb, Ch. Schmidt, H.C. Weddig
    DESY, Hamburg, Germany
  • W. Cichalewski, D.R. Makowski, A. Piotrowski
    TUL-DMCS, Łódź, Poland
  • K. Czuba, I. Rutkowski, D. Sikora, L. Zembala, M. Żukociński
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • I.M. Kudla
    NCBJ, Świerk/Otwock, Poland
  • K. Oliwa, W. Wierba
    IFJ-PAN, Kraków, Poland
  
  The Free-Electron Laser in Hamburg (FLASH) is now equipped with a MicroTCA-based (MTCA.4) low-level radio frequency (LLRF) system, to replace the previous VME system and to serve as a test bench for the European X-ray Free Electron Laser (XFEL) LLRF system. This paper presents details on the new FLASH LLRF system setup, including installations inside the radiation prone tunnel environment. The benefits and preliminary results of the newly installed system are also given.  
 
THP089 Design of LLRF System for RAON LLRF, feedback, FPGA, target 1135
 
  • H. Do, O.R. Choi, J. Han, J.-W. Kim
    IBS, Daejeon, Republic of Korea
  • C.K. Hwang
    KAERI, Daejon, Republic of Korea
  
  The low-level RF (LLRF) system being designed for RAON will allow research in the rare isotope beam facility. The LLRF system is used to feed the superconducting quarter-wave resonator having the frequency of 81.25 MHz with controlled the amplitude and phase of RF. The LLRF system uses a field programmable gate array (FPGA) to provide controlled RF amplitude and phase with ±1° and less than ±1% of stabilities, respectively. The resolution and working range is 0.004 dB and 20 dB in amplitude, respectively, and 0.5° and 360° in phase. For the RF performance test, a prototype of LLRF system is designed and fabricated. This paper will describe the design detail. Also, testing results of the prototype of LLRF system are presented.  
 
THP096 Recent Upgrade of Ultra-Broadband RF System for Cavity Characterization cavity, software, operation, pick-up 1151
 
  • S. Stark, V. Palmieri, A.M. Porcellato, A.A. Rossi
    INFN/LNL, Legnaro (PD), Italy
  • V. Palmieri
    Univ. degli Studi di Padova, Padova, Italy
  
  The first computer controlled RF system for SC cavity characterization entered into operation at INFN-LNL in 1994. Since then it has been successfully used for testing SC cavities of different shapes and frequencies. Recently we performed an important upgrade on it in order to cover a wider frequency range and to take advantage of the better performance of nowadays electronic devices. The paper describes the present system layout, dedicated software, sequences of calibration and testing procedures and moreover discusses further upgrading possibilities.