07 Accelerator Technology and Main Systems
T09 Room-temperature Magnets
Paper Title Page
MOODB102 Multiple Function Magnet Systems for MAX IV 34
 
  • F. Bødker, C.E. Hansen, N. Hauge, E.K. Krauthammer, D. Kristoffersen, G. Nielsen, C.W.O. Ostenfeld, C.G. Pedersen
    Danfysik A/S, Taastrup, Denmark
  
  Danfysik is currently producing 60 up to 3.3 m long magnet systems consisting of up to 12 multipole magnets integrated into each of the yokes for the bending achromats of the MAX IV 3 GeV storage ring and 12 similar systems for the MAX IV 1.5 GeV storage ring. Each magnet yoke contains combined function soft-end dipole and quadrupole elements which are machined out of one single iron block at tolerances of ± 0.02 mm. In addition, separate, higher order multipole magnets are kinematically mounted into the yokes. The integration of many magnetic elements into single yoke structures enables a compact, low emittance storage ring design. The dipole and quadrupole magnetic elements are magnetically field mapped with high precision on a 3D hall probe measuring bench. Higher order multipoles are measured on a slow rotating coil system developed for that purpose. Much effort has been put into automation in order to quickly perform the very comprehensive measurement program each girder will through.  
slides icon Slides MOODB102 [2.701 MB]  
 
THPEA062 Magnetic Field Measurements for the IAC-RadiaBeam THz Project 3282
 
  • P. Buaphad, Y. Kim, M. Williams
    ISU, Pocatello, Idaho, USA
  • A. Andrews, T. Downer, C.F. Eckman, Y. Kim, M. Smith
    IAC, Pocatello, IDAHO, USA
  
  At the Idaho Accelerator Center (IAC) of Idaho State University, recently, a new chicane with four dipoles and quadrupole triplet magnets were installed in a 44 MeV linac to perform the IAC-RadiaBeam Terahertz (THz) project. To generate high power THz radiation, a THz radiator with numerous periodic gratings was also installed downstream of the quadrupole triplet. However, the electron beam shape at the radiator has to be horizontally focused strip-like one due to a tiny radiator gap with a width of 1.2 mm, and electron bunch length should be about a few picosecond (ps) to generate high power THz radiation in the radiator. By using the quadrupole triplet and chicane dipoles, we can control the transverse beam profile and bunch length freely. In this paper, we report the measured field maps of the dipole and quadrupole magnets, their effective lengths, and field strength or gradient as a function of the magnet power supply current.  
 
THPME001 Permanent Magnets in Accelerators can save Energy, Space, and Cost 3511
 
  • F. Bødker, L.O. Baandrup, A. Baurichter, N. Hauge, K.F. Laurberg, B.R. Nielsen, G. Nielsen
    Danfysik A/S, Taastrup, Denmark
  • O. Balling
    Aarhus University, Aarhus, Denmark
  • F.B. Bendixen, P. Kjeldsteen, P. Valler
    Sintex A/S, Hobro, Denmark
  • S.P. Møller, H.D. Thomsen
    ISA, Aarhus, Denmark
  • H.-A. Synal
    ETH, Zurich, Switzerland
  
  Green Magnet technology with close to zero electrical power consumption without the need for cooling water saves costs, space and hence spares natural resources. A compact dipole based on permanent magnets has been developed at Danfysik in collaboration with Sintex and Aarhus University. This first Green Magnet has been delivered to ETH Zurich for testing in a compact accelerator mass spectrometer facility. Permanent NdFeB magnets generate a fixed magnetic field of 0.43 T at a gap of 38.5 mm without using electrical power in the H-type 90° bending magnet with a bending radius of 250 mm. Thermal drift of the permanent magnets is passively compensated. Small air cooled trim coils permit fine tuning of the magnetic field. Magnetic field measurements and thermal stability tests show that the Green Magnet fully meets the magnetic requirements of the previously used electromagnet. The use of Green Magnet technology in other accelerator systems like synchrotron light sources is discussed.  
 
THPME003 Standard Sextupole Magnets for NSLS-II Synchrotron 3517
 
  • C.W.O. Ostenfeld, N. Hauge, P. Ladefoged
    Danfysik A/S, Taastrup, Denmark
  
  Danfysik received the order to design, manufacture and test 169 Standard Sextupole Magnets for the NSLS-2 synchrotron. Extraordinary tight tolerances were specified for the mechanical and magnetic properties. We present a re-optimized magnetic pole profile to make a more mechanically robust design, suitable for large-scale manufacture. Due to a well-controlled wire erosion process during the manufacturing stage, the mechanical tolerances were kept on the 10 micron level, even after assembly/disassembly cycles. A major challenge of the project was to verify the magnetic performance of the magnets. This was done using our in-house harmonic measurement bench. We present magnetic measurements of the magnet series, measured over more than 24 months, which show high stability, both in terms of magnetic roll angle, error field terms, and integrated strength.  
 
THPME008 Experimental Study of Magnetic Properties for Magnet Material in CYCIAE-100 3525
 
  • J.Q. Zhong, T. Cui, M. Li, C. Wang, Z.H. Wang, J.J. Yang, T.J. Zhang
    CIAE, Beijing, People's Republic of China
  
  The magnetic property of magnet material is one of the key factors that influence the distribution of magnetic field in large scale cyclotrons, especially embody on the vertical focusing of field and the first harmonic field error in cyclotron. According to the requirements of the physical design of CYCIAE-100, we have studied the pivotal factors, which impact on the maximum permeability, coercivity and B-H curve of material of CYCIAE-100 magnet, including the cooling rate during magnetic annealing and residual stress. The study results will be shown in this paper.  
 
THPME011 Magnetic Field Design of the BAPS High Precision Quadrupole Magnet 3531
 
  • Y.S. Zhu, F.S. Chen, W. Kang, X.J. Sun
    IHEP, Beijing, People's Republic of China
  
  The Beijing Advanced Photon Source (BAPS) is a high performance light source planned to be constructed in China. High precision small aperture quadrupole magnets are required in the BAPS storage ring, which needs extremely high mechanical accuracy. Instead of the conventional manufacture method, the coils are comprised of several U-shaped solid copper sheets. So two-piece structure of the iron core can be adopted to reduce assembly error and improve the poles symmetry. Design considerations, 2D and 3D magnetic field calculations are presented in detail, and the needed mechanical precision is estimated according to the error field analysis.  
 
THPME012 Measuring the Direction of Permanent Magnet Easy Axis by Helmholtz Coil 3534
 
  • X.Y. Jia, S.X. Zheng
    TUB, Beijing, People's Republic of China
  
  Permanent magnets for quadrupole focusing was used in drift-tube linac of the Compact Pulsed Hadron Sources(CPHS) in Tsinghua university. In order to ensure the accuracy of the quadrupole field can meet the design requirement, we need measure the strength and direction of remanence and choose the suit magnet. This paper proposed an easy way to get the direction of permanent magnet easy axis by Helmholtz coil without knowing the angle between magnet and the axis of the coil: the magnet rotational angle data was measured by rotary encoder and encoder would send trigger signal every turn at the same direction. First we started to record data when trigger signal was appeared. Then measured the magnet in three perpendicular directions (x,y,z). Last, caculated the remanence in three directions. We had measured some magnet by the new method and obtained satisfactory results.  
 
THPME013 MAGNET SUBSYSTEM OF HLS II 3537
 
  • Q. Luo, N. Chen, G. Feng, N. Hu
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  Funding: Work supported by Natural Science Foundation of China 11005106
To improve the performance of the Hefei Light Source (HLS), in particular to get higher brilliance synchrotron radiation and increase the number of straight section insertion devices, NSRL is now upgrading HLS to HLS II. Most of the magnets had to be replaced in this project. To measure the magnets, set of the magnetic measurement equipment in NSRL are also re-built. New magnets are sample measured, the discreteness and uniformity of integrated magnetic field all meet the requirements. Piecewise fitting and electron tracking of bending magnets for injector and beam transport line were performed and the results showed that the electron trajectory fitted the physical design well. 		 
 
THPME018 Design of Dipole and Quadrupole for THz-FEL at CAEP 3540
 
  • L.G. Yan, W. Bai, D.R. Deng
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  
  The high average power terahertz free electronic laser (THz-FEL) is being constructed at CAEP (China Academy of Engineering Physics), which is designed for lasing between 100-300 μm. The magnets of THz-FEL include 3 dipoles and 6 quadrupoles, and their fields and field quality were required by 6-9 MeV operation. This proceeding introduced the design and the main parameters of these magnets. The higher harmonic content of the magnetic field was also analyzed. All the design of magnets achieved the goal.  
 
THPME021 Application of Magnetic Field Integral Measurement of Magnet Module to Research Alterable Gap Undulator 3549
 
  • H.F. Wang, W. Zhang, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  
  A set of magnetic measurement system and a suitable magnetic field optimization method for an In-Vacuum Undulator (IVU) with alterable gaps have been developed. The method is based on assembling orders and directions of all magnet modules for correcting rms optical phase error, electron trajectory and multipole components of the IVU. Magnetic field distributions on axis and off axis of every magnet block module are measured. Then the appropriate magnetic block modules will be chosen from measured magnet modules according to a sorting algorithm and assemble them to two inner girders of an IVU. This paper will describe a magnetic field measurement system, magnetic field optimization method and optimized results of an IVU with a period of 20 mm.  
 
THPME023 A NEW HARMONIC COIL BENCH AT SINAP FOR THE ALS COMBINED FUNCTION SEXTUPOLE MAGNETS 3552
 
  • J.D. Zhang, H.W. Du, L. Yin, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  • N. Li, A. Madur
    LBNL, Berkeley, California, USA
  
  A new harmonic coil bench has been developed at Shanghai Institute of Applied Physics (SINAP) to measure the ALS combined function sextupole magnets. The measurement system has been designed with the aim to perform precise, fast and reliable measurements of series of magnets. It determines the strength, and the multipole content of the field as well as the magnetic axis for precise positioning of alignment targets on top of the multipoles. The multipole, while supported on a marble platform, can be moved with regard to the rotating coil using multi-dimensional adjustment plate. The resolution of the movement is read out by micrometer with a few μm resolutions. This article introduces the measurement system constitutes.  
 
THPME026 First Results of the PAL-XFEL Prototype Undulator Measurements 3561
 
  • D.E. Kim, H.S. Han, Y.-G. Jung, H.-G. Lee, S.B. Lee, W.W. Lee, K.-H. Park, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  • M.-H. Cho, I.S. Ko
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  
  Pohang Accelerator Laboratory (PAL) is developing 10 GeV, 0.1 nm SASE based FEL for high power, short pulse X-ray coherent photon sources named PAL-XFEL. At the first stage PAL-XFEL needs two undulator lines for photon source. PAL is developing undulator magnetic structure based on EU-XFEL design. The hard X-ray undulator features 7.2 mm min magnetic gap, and 5.0 m magnetic length with maximum effective magnetic field larger than 0.908 T to achieve 0.1nm radiation at 10 GeV electron energy. A prototype for PAL-XFEL Xray undulator line is completed and the measurement, correction results are summarized.  
 
THPME027 Design and Fabrication of Prototype Phase Shifter for PAL XFEL 3564
 
  • H.-G. Lee, Y.-G. Jung, H.-S. Kang, D.E. Kim, S.B. Lee, W.W. Lee, K.-H. Park, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Pohang Accelerator Laboratory(PAL) is developing a SASE X-ray Free Electron Laser based on 10 GeV linear accelerator. Prototype phase shifters are being developed to be used for the X-ray and Soft X-ray undulator line. The phase shifters will be used to adjust the phase of the electron beam with respect to that of the radiation field. Two prototype phase shifters are being developed. One is based on the EU-XFEL phase shifter using zero-potential iron yoke, and the other one is similar to FERMI phase shifter where only permanent magnets are used. Driving system consists of 5 phase stepping motor, left/right handed ball screw and absolute linear encoder. In this paper, we describe the design, fabrication and test results of the two phase shifter prototypes.  
 
THPME029 Design of NSLS-II Booster Dipoles with Combined-function Magnetic Field 3570
 
  • S.V. Sinyatkin, A.N. Dubrovin, S.M. Gurov, E.B. Levichev, Yu.A. Pupkov, E.R. Rouvinsky, A.V. Sukhanov
    BINP SB RAS, Novosibirsk, Russia
  
  Focusing and defocusing dipoles magnets of NSLS-II 3 GeV booster are designed, manufactured and measured in BINP, Russia. The magnets should provide the booster operation at energy from 170 MeV to 3.15 GeV with a 2 Hz frequency. Because of booster compactness the dipoles have quadrupole and sextupole components and should create high quality of field of ± 2·10-4 in region of ± 2 cm. In this paper the design and results of 2D and 3D simulation are presented.  
 
THPME030 Magnetic Measurement Results of the NSLS-II Booster Dipole Magnets 3573
 
  • S.V. Sinyatkin, G.N. Baranov, A.M. Batrakov, P.N. Burdin, D.B. Burenkov, S.M. Gurov, V.A. Kiselev, V.V. Kobets, E.B. Levichev, I.N. Okunev, A. Polyansky, Yu.A. Pupkov, L.E. Serdakov, P. Vobly
    BINP SB RAS, Novosibirsk, Russia
  
  Focusing and defocusing dipole magnets for NSLS-II 3 GeV booster are designed, manufactured and measured in BINP, Russia. Magnetic measurements of 32 BD and 28 BF magnets are made by BINP. In this paper the results of magnetic measurements of dipoles magnets in the field area of 0.638 – 11.829 kGs for BD type and 0.260 - 4.829 kGs for BF type are given. Analysis and comparison with magnetic field simulation are made.  
 
THPME031 Ramped Magnetic Measurement of NSLS-II Booster Dipoles 3576
 
  • I.N. Okunev, G.N. Baranov, A.M. Batrakov, A.I. Erokhin, V.A. Kiselev, V.V. Kobets, A.V. Pavlenko, S.V. Sinyatkin, R.V. Vakhrushev
    BINP SB RAS, Novosibirsk, Russia
  
  13. The magnetic system of NSLS II Booster are designed, manufactured and tested in BINP, Russia. The dipoles of the Booster have quadrupole and sextupole components and should create high quality of field ± 2·10-4 in region ± 2 cm. Magnets should provide performance of booster for energy from 170 MeV to 3.15 GeV with 2 Hz frequency. This report considers ramped magnetic measurement of NSLS-II Booster Dipoles.  
 
THPME032 Magnetic Measurement of the NSLS-II Booster Dipole with Combine Functions 3579
 
  • I.N. Okunev, G.N. Baranov, A.M. Batrakov, P.N. Burdin, D.B. Burenkov, V.V. Kobets, A. Polyansky, L.E. Serdakov, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  
  The magnetic system of NSLS II Booster are designed, manufactured and tested in BINP, Russia. The dipoles of the Booster have quadrupole and sextupole components and should create high quality of field ± 2·10-4 in region ± 2 cm. Magnets should provide performance of booster for energy from 170 MeV to 3.15 GeV with 2 Hz frequency. To measure multipole field components one need to know accurate position of the probes in 3D coordinates. This report considers description of the magnetic measurement stand and achived accuracy for DC case.  
 
THPME033 Pulsed Magnets for Injection and Extraction Sections of NSLS-II 3 GeV Booster 3582
 
  • A.N. Zhuravlev, A.M. Batrakov, A.D. Chernyakin, V.A. Kiselev, V.M. Konstantinov, A.V. Pavlenko, V.V. Petrov, E.P. Semenov, D.V. Senkov
    BINP SB RAS, Novosibirsk, Russia
  
  Magnets for injection and extraction sections of NSLS-II 3 GeV booster are designed, manufactured and tested in BINP, Russia. This report considers the details of bump and septum magnets design, their parameters and results of inspection test in BINP. The design and electronics features of the measurement stand for these magnets are presented. Also, capabilities of specialized power supplies are listed and discussed. Finally, the first results of injection and extraction sections commissioning at BNL site are reported.  
 
THPME036 Design and Measurement of the Transfer Line Magnets for the Taiwan Photon Source 3591
 
  • C.Y. Kuo, C.-H. Chang, H.-H. Chen, Y.L. Chu, J.C. Huang, M.-H. Huang, C.-S. Hwang, J.C. Jan, F.-Y. Lin
    NSRRC, Hsinchu, Taiwan
  
  The Taiwan photon source (TPS) transfer line from the linac to the booster (LTB) is made of 1 bending magnet, 11 quadrupoles and the booster to the storage ring (BTS) is include of 2 bending magnets, 7 quadrupoles. LTB bending magnet is provided for 11 degrees defection from the linac to the booster and 31 degrees from the linac to the beam dumper with two operating currents. The BTS quadrupoles are included four 0.3m and three 0.4m magnets which cross sections are the same with booster quadrupole give different integral quadrupole field strengths and cooling systems are redesign from 2 circuits to 4. The magnetic fields were simulated with Opera 2D and 3D; optimum processes are discussed. All of the magnets have been constructed by Danfysik, scanditronix and Gongin. This paper discusses the features, the design concept and the results of field measurements of these transfer line magnets.  
 
THPME037 Magnetic Field Character of TPS Booster Magnets 3594
 
  • J.C. Jan, C.-H. Chang, H.-H. Chen, Y.L. Chu, M.-H. Huang, C.-S. Hwang, C.Y. Kuo, F.-Y. Lin, C.S. Yang, Y.T. Yu
    NSRRC, Hsinchu, Taiwan
  
  The Taiwan Photon Source (TPS) is a 3-GeV synchrotron radiation facility operated in top-up injection mode. The booster ring of TPS shares the same tunnel, concentric with the storage ring. The lattice of the booster is a 24-cell DBA of circumference 496.8 m. The energy of the electron beam is ramped from 150 MeV to 3 GeV at repetition rate 3 Hz in the booster ring. The trajectory of the electron beam is controlled with complicated combined-function magnets including combined dipole magnet, combined quadrupole magnet, pure quadrupole magnet, sextupole magnet and corrector magnet. The measurement and performance of these magnets are discussed in this letter.  
 
THPME041 Configurable Field Magnets for a Proton Beam Dynamics R&D Ring 3603
 
  • S.J. Brooks
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  Magnets with many independently-powered coils can provide nearly arbitrary combinations of multipoles up to a certain order. This paper gives examples of field quality in such an "omni-magnet", which is normal-conducting and simulated with Poisson. Since the magnets also have quite large apertures they may be used to make a general-purpose FFAG and synchrotron test ring for beam dynamics studies. This could use the 3MeV H− beam from the RAL proton Front End Test Stand (FETS) and outline ring parameters are given for that situation.  
 
THPME043 Prototype Adjustable Permanent Magnet Quadrupoles For CLIC 3606
 
  • B.J.A. Shepherd, J.A. Clarke
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Bartalesi, M. Modena, M. Struik
    CERN, Geneva, Switzerland
  • N.A. Collomb
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  
  The 42km long Drive Beam Decelerator for the Compact Linear Collider (CLIC) requires over 41,000 quadrupole magnets. ASTeC and CERN are investigating the possibility of permanent magnet quadrupoles (PMQs) to reduce running costs and heat load inside the CLIC tunnel. A prototype of a high-strength adjustable PMQ has been built, based on a simple concept using two moving sections each containing a pair of large permanent magnets. The gradient can be adjusted within a range of 15-60 T/m (3-15T integrated gradient). The prototype has undergone extensive magnetic testing at Daresbury Laboratory and CERN, and performs well in line with expectations. A prototype of the low-strength version (0.9-9T) is currently under construction.  
 
THPME046 A Summary of the Quality of the ALS Combined Function Sextupole Magnets 3615
 
  • N. Li, A. Madur
    LBNL, Berkeley, California, USA
  • C. Chen, H.J. Hu, J. Jin, Y.M. Wen, L. Yin, J.D. Zhang, Q.G. Zhou
    SINAP, Shanghai, People's Republic of China
  
  Funding: This work was supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC02-05CH11231.
A total of 51 combined function magnets is required to upgrade the Advanced Light Source (ALS) Storage Ring at LBNL. These magnets will provide 4 types of magnetic fields: sextupole, horizontal and vertical dipoles, and skew quadrupole and will enable an emittance reduction and upgrade of the beam quality in the ALS ring. A relatively new procedure using EDM cut poles after core assembly that was first used by Buckley System Ltd, NZ was adopted during the production of these magnets. Also, a new 3D CAD modeling was used for the coil design. A total of 57 magnets (including prototypes and spare magnets) were built by the Shanghai Institute of Applied Physics (SINAP) in China. These magnets have achieved extraordinarily high pole profile accuracies and exhibit excellent coil performance characteristics: resistances and water flows reached a high degree of consistency. Consequently, the system errors of the magnetic field of these magnets all meet the LBNL specifications. This paper will summarize the mechanical quality and magnetic field properties of these magnets. The interrelationship between the qualities of coil and the magnet field will be described as well. 		 
 
THPME052 Analysis of the NSLS-II Magnet Measurement Data 3624
 
  • W. Guo, A.K. Jain, S.K. Sharma, J. Skaritka, C.J. Spataro
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE, Contract No. DE-AC02-98CH10886
NSLS-II is a third generation 3GeV light source that is under-construction at the Brookhaven National Laboratory. The 30-DBA-cell storage ring will provide micron size beam resulting from the 1nm emittance. Recently the last magnet was received and the completion of girder installation in the tunnel is foreseeable in a few months. In this paper we will briefly review the physics considerations for the magnet specifications, the major field quality related issues that arose during the fabrication process. Our emphasis will be on the statistical analysis of the magnet measurement results and comparison with the design tolerances.