TY - CONF AU - Miski-Oglu, M. AU - Aulenbacher, K. AU - Barth, W.A. AU - Basten, M. AU - Burandt, C. AU - Busch, M. AU - Conrad, T. AU - Dziuba, F.D. AU - Gettmann, V. AU - Heilmann, M. AU - Kürzeder, T. AU - Podlech, H. AU - Rubin, A. AU - Schnase, A. AU - Schwarz, M. AU - Yaramyshev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Beam Commissioning of the Demonstrator Setup for the Superconducting Continuous Wave HIM/GSI-Linac J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - During successful beam commissioning of the superconducting 15-gap Crossbar H-mode cavity at GSI Helmholtzzentrum für Schwerionenforschung heavy ions up to the design beam energy have been accelerated. The design acceleration gain of 3.5 MeV inside a length of less than 70 cm has been reached with full transmission for heavy ion beams of up to 1.5 particle mueA. The measured beam parameters confirm sufficient beam quality. The machine beam commissioning is a major milestone of the R&D for the superconducting heavy ion continuous wave linear accelerator HELIAC of Helmholtz Institute Mainz (HIM) and GSI developed in collaboration with IAP Goethe-University Frankfurt. The next step is the procurement and commissioning of so called ’Advanced Demonstrator’ - the first of series cryo module for the entire accelerator HELIAC. Results of further Demonstrator beam tests, as well as the status of the Advanced demonstrator project will be reported. PB - JACoW Publishing CP - Geneva, Switzerland SP - 33 EP - 36 KW - cavity KW - linac KW - heavy-ion KW - cryomodule KW - solenoid DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOZZPLM1 UR - http://jacow.org/ipac2019/papers/mozzplm1.pdf ER - TY - CONF AU - Lauber, S. AU - Aulenbacher, K. AU - Barth, W.A. AU - Burandt, C. AU - Dziuba, F.D. AU - Forck, P. AU - Gettmann, V. AU - Heilmann, M. AU - Kürzeder, T. AU - List, J. AU - Miski-Oglu, M. AU - Podlech, H. AU - Rubin, A. AU - Schwarz, M. AU - Sieber, T. AU - Yaramyshev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Reconstruction of the Longitudinal Phase Portrait for the SC CW Heavy Ion HELIAC at GSI J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - At the GSI Helmholtzzentrum für Schwerionenforschung (GSI) in Darmstadt, Germany, the HElmholtz LInear ACcelerator (HELIAC) is currently under construction. The HELIAC comprises superconducting multigap Crossbar H-mode (SC CH) cavities. The input beam is delivered by an already existing High Charge Injector (HLI). For the further development of the accelerator a detailed knowledge of the input beam parameters to the SC section is necessary. A method for beam reconstruction is incorporated, which provides for longitudinal beam characteristics using measurements with a beam shape monitor and a particle simulation code. This finalizes the investigations on 6D beam parameters, following previous measurements in transversal phase space. The reconstruction of the longitudinal phase portrait is presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 898 EP - 901 KW - heavy-ion KW - linac KW - cavity KW - proton KW - quadrupole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS024 UR - http://jacow.org/ipac2019/papers/mopts024.pdf ER - TY - CONF AU - Schwarz, M. AU - Aulenbacher, K. AU - Barth, W.A. AU - Basten, M. AU - Burandt, C. AU - Busch, M. AU - Conrad, T. AU - Dziuba, F.D. AU - Gettmann, V. AU - Heilmann, M. AU - Kürzeder, T. AU - Lauber, S. AU - List, J. AU - Miski-Oglu, M. AU - Podlech, H. AU - Rubin, A. AU - Yaramyshev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Advanced Beam Dynamics Design for the Superconducting Heavy Ion Accelerator HELIAC J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The standalone superconducting (SC) continuous wave (CW) heavy ion linac HELIAC (HElmholtz LInear ACcelerator) is a common project of GSI and HIM under key support of IAP Frankfurt and in collaboration with Moscow Engineering Physics Institute (MEPhI) and Moscow Institute for Theoretical and Experimental Physics (KI-ITEP). It is intended for future experiments with heavy ions near the Coulomb barrier within super-heavy element (SHE) research and aims at developing a linac with multiple CH cavities as key components downstream the High Charge State Injector (HLI) at GSI. The design is challenging due to the requirement of intense beams in CW mode up to a mass-to-charge ratio of 6, while covering a broad output energy range from 3.5 to 7.3 MeV/u with minimum energy spread. In 2017 the first superconducting section of the linac has been successfully commissioned and extensively tested with beam at GSI. In the light of experience gained in this research so far, the beam dynamics layout for the entire linac has recently been updated and optimized with particular emphasis on realistic assumptions of cavity gap and drift lengths as well as gap voltage distributions for CH3’CH11. PB - JACoW Publishing CP - Geneva, Switzerland SP - 928 EP - 931 KW - cavity KW - linac KW - heavy-ion KW - SRF KW - acceleration DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-MOPTS034 UR - http://jacow.org/ipac2019/papers/mopts034.pdf ER - TY - CONF AU - Kuske, B.C. AU - Anders, W. AU - Aulenbacher, K. AU - Hug, F. AU - Jankowiak, A. AU - Neumann, A. AU - Stengler, T. AU - Stoll, C.P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Incorporation of a MESA Linac Modules into BERLinPro J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - BERLinPro is an Energy Recovery Linac (ERL) project, currently being set up at the Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany. BERLinPro is designed as - and for - experiments in accelerator physics and as a test bed for novel ERL components. MESA is an ERL project under construction at the Johannes Gutenberg-Universität, Mainz, Germany. MESA is designed as a user facility to perform experiments in dark matter physics and precision measurements of natural constants. Despite the diverse goals, the main linac, providing the larger part of the particles energy, is fairly compatible. It is planned to test and run the MESA linac module in BERLinPro, prior to its usage in MESA. The goals and benefits of this unique cooperation for both projects are outlined in this paper. The necessary adaptions in BERLinPro, including hardware aspects, the new optics, and the scope of performance are described. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1449 EP - 1452 KW - linac KW - optics KW - operation KW - HOM KW - cavity DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPGW023 UR - http://jacow.org/ipac2019/papers/tupgw023.pdf ER - TY - CONF AU - Friederich, S. AU - Aulenbacher, K. AU - Matejcek, C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Vacuum Lifetime and Surface Charge Limit Investigations Concerning High Intensity Spin-polarized Photoinjectors J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Small Thermalized Electron Source at Mainz (STEAM) is a dc photoemission source. It is designed to operate at up to 200kV bias voltage with an accelerating field of up to 5 MV/m at the cathode surface. In several experiments, the properties of GaAs operating under the conditions of spin-polarized photoemission were investigated. Its performance, quantum efficiency lifetime and surface charge limit observations for bulk-GaAs will be discussed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1954 EP - 1957 KW - cathode KW - electron KW - vacuum KW - laser KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-TUPTS011 UR - http://jacow.org/ipac2019/papers/tupts011.pdf ER - TY - CONF AU - Busch, M. AU - Barth, W.A. AU - Basten, M. AU - Conrad, T. AU - Dziuba, F.D. AU - Miski-Oglu, M. AU - Müller, P. AU - Podlech, H. AU - Schwarz, M. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Overview on SC CH-Cavity Development J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - During the last decades an enermous effort has been put into the development of low beta structures for hadron acceleration worldwide. Since hadrons exhibit a very inert velocity gain due to their high mass this change in speed has to be taken into account when utilizing low beta cavities. At the Institute of Applied Physics (IAP), Frankfurt, Germany, five multi-cell CH-cavities (Crossbar H-Mode) have been developed and tested for different kind of applications so far. In addition to the successfully tested original 360 MHz prototype further structures envisaged for beam operation have been fabricated and tested. Overview, status and outlook of this cavity technology is topic of this contribution. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2822 EP - 2825 KW - cavity KW - linac KW - SRF KW - heavy-ion KW - status DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB012 UR - http://jacow.org/ipac2019/papers/weprb012.pdf ER - TY - CONF AU - Dziuba, F.D. AU - Aulenbacher, K. AU - Barth, W.A. AU - Basten, M. AU - Burandt, C. AU - Busch, M. AU - Conrad, T. AU - Gettmann, V. AU - Heilmann, M. AU - Kürzeder, T. AU - Lauber, S. AU - List, J. AU - Miski-Oglu, M. AU - Podlech, H. AU - Salvatore, J. AU - Schnase, A. AU - Schwarz, M. AU - Yaramyshev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Further RF Measurements on the Superconducting 217 MHz CH Demonstrator Cavity for a CW Linac at GSI J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Recently, the first section of the superconducting (sc) continuous wave (cw) Linac has been extensively tested with heavy ion beam from the GSI High Charge State Injector (HLI). During this testing phase, the reliable operability of 217 MHz multi gap crossbar-H-mode (CH) cavities has been successfully demonstrated. The sc 217 MHz CH cavity (CH⁰) of the demonstrator setup accelerated heavy ions up to the design beam energy and even beyond at high beam intensities and full transmission. This worldwide first beam test with a sc CH cavity is a major milestone on the way realizing the entire sc cw Linac project. In this contribution further RF measurements on the cavity are presented providing full characterization of the RF structure. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2826 EP - 2829 KW - cavity KW - linac KW - heavy-ion KW - MMI KW - operation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB014 UR - http://jacow.org/ipac2019/papers/weprb014.pdf ER - TY - CONF AU - Kürzeder, T. AU - Aulenbacher, K. AU - Barth, W.A. AU - Burandt, C. AU - Conrad, J. AU - Dziuba, F.D. AU - Gettmann, V. AU - Heine, R.G. AU - Hug, F. AU - Lauber, S. AU - List, J. AU - Miski-Oglu, M. AU - Stengler, T. AU - Yaramyshev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Cleanroom Installations for SRF Cavities at the Helmholtz-Institut Mainz J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - At the Helmholtz-Institut Mainz (HIM) a cleanroom has been equipped with new tools and installations for the planned treatment of different superconducting RF-cavities. At first TESLA/XFEL type 9-cell cavities for the Mainz Energy-Recovering Superconducting Accelerator (MESA) project or 217 MHz multigap Crossbar H-mode cavities for the HElmholtz LInear ACcelerator (HELIAC) under development by HIM and GSI will be treated. The cleanroom installations, including the greyroom, cover an area of about 155 sqm. In its ISO-class 6 area a large ultrasonic and a conductance rinsing bath has been installed recently. A high pressure rinsing cabinet (HPR) has been implemented between the ISO-class 6 and 4 cleanroom. A RF-cavity can be loaded and unloaded from both sides. HPR treatments are possible for cavities of up to 1.4 m length and about 0.7 m diameter. For drying the ISO-class 4 clean room is equipped with a 160 C vacuum oven. New cleanroom lifters allow the handling of up to 200 kg heavy objects. A rail system in the cleanroom floor is installed to move out the entire cold string of the cleanroom after assembly and leak testing. First operational experiences with this facility will be presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2830 EP - 2833 KW - cavity KW - operation KW - vacuum KW - heavy-ion KW - SRF DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPRB015 UR - http://jacow.org/ipac2019/papers/weprb015.pdf ER - TY - CONF AU - Barth, W.A. AU - Fomichev, A.S. AU - Grigorenko, L.V. AU - Kulevoy, T. AU - Polozov, S.M. AU - Yaramyshev, S. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Charge Stripping at High Energy Heavy Ion Linacs J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - For heavy-ion accelerator facilities charge stripping is a key Technology: the stripping charge state, its efficiency to produce ions in the required charge state, and the beam quality after stripping substantially determine the entire accelerator performance. Modern heavy ion accelerator facilities such as the future Facility for Antiproton and Ion Research (FAIR) at GSI provide for high intensity heavy ion beams beyond 200 MeV/u. Heavy ion stripping at a lower energy enables more efficient acceleration up to the final beam energy, compared to acceleration of ions with a low charge state. Due to the high power deposited by the heavy ions in the stripping media and radiation damages if a solid target is used, self-recovering stripper media must be applied. General implementation options for different stripper target media are discussed in this paper, as well as general considerations to optimize the Linac layout through the appropriate choice of stripping medium and stripping energy. The driver Linac for the Dubna Electron-Radioactive Isotope Collider fAcility (DERICA) project, recently initiated by JINR, is foreseen to provide for 100 MeV/u Uranium beam in continuous wave mode. First layout scenarios of a one-step and a two-step DERICA-stripper approach will be also presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3452 EP - 3455 KW - heavy-ion KW - linac KW - target KW - acceleration KW - ion-source DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP005 UR - http://jacow.org/ipac2019/papers/thpmp005.pdf ER - TY - CONF AU - Ledroit, B. AU - Aulenbacher, K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Collimation of Target Induced Halo Following MAGIX at MESA J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The Mainz Energy-recovering Superconducting Accelerator (MESA) will be an electron accelerator allowing operation in energy-recovery linac (ERL) mode. It provides the opportunity to operate scattering experiments at energies of ~100 MeV with thin gas-targets. The MESA Internal Gas Target Experiment (MAGIX) aims to operate windowless jet targets and different gases up to Xenon to search for possible dark photon interactions, to precisely measure the magnetic proton radius and astrophysical S-factors. Investigations on the impact of the target on beam dynamics and beam losses are required for machine safety and to examine limits to ERL operation. The goal of this work is to understand target induced halo in the different experimental setups, track halo particles through downstream sections to examine beam losses and include a suitable collimation system and shielding into the accelerator layout to protect the machine from direct and indirect damage through beam losses and radiation. The present status of the investigations is presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3839 EP - 3842 KW - target KW - simulation KW - beam-losses KW - experiment KW - cryomodule DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPRB019 UR - http://jacow.org/ipac2019/papers/thprb019.pdf ER - TY - CONF AU - Heidrich, S. AU - Aulenbacher, K. AU - Bruker, M.W. AU - Dehn, M. AU - Heil, P. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - High-Current Emittance Measurements at MAMI J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The effects of high beam currents and different types of electron sources on the emittance of the beam at the 3.5 MeV beamline of the Mainzer Microtron MAMI were observed. A thermionic BaO source and a GaAs-based photo-source that allows spin polarization were used. In order to measure the beam size, a new type of wire scanner was utilized. The results show maximum normalized emittance values in the order of a few hundred nmrad for both sources, which lies distinctly within the acceptance of the higher energy stages of the accelerator. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4121 EP - 4123 KW - emittance KW - quadrupole KW - electron KW - experiment KW - simulation DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS009 UR - http://jacow.org/ipac2019/papers/thpts009.pdf ER -