Keyword: power-supply
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MOPIK033 The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC septum, feedback, operation, extraction 573
 
  • T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
    KEK, Ibaraki, Japan
  • K.J. Kuanjun
    HUST, Wuhan, People's Republic of China
  
  The J-PARC Main Ring (MR) is being upgraded to improve its beam power to the design goal of 750 kW. One important way is to reduce the repetition period from 2.48 s to 1.3 s so that the beam power can be nearly doubled. We need to improve the septum magnets for fast extraction. We are improving the magnets and their power supplies. The present magnets which is conventional type have problem in durability of septum coil by its vibration, and large leakage field. The new magnets are eddy current type. The eddy current type does not have septum coil, but has a thin plate. We expect that there is no problem in durability, we can construct the thin septum plate, the leakage field can be reduced. The output of the present power supply are pattern current which of flat top is 10 ms width, the new one is short pulse which of one is 10 us. The short pulse consists of 1st and 3rd higher harmonic. We can expect that the flatness and reproducibility of flat top current can be improved. The calorific power can be also reduced. This paper will report the field measurement results with the eddy septum magnet systems.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK033  
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MOPIK034 The New High Field Injection Septum Magnet System for Main Ring of J-PARC septum, injection, operation, flattop 576
 
  • T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
    KEK, Ibaraki, Japan
  • K. Fan
    HUST, Wuhan, People's Republic of China
  
  We are improving the Main Ring (MR) for beam power of 750 kw which is the first goal of J-PARC. The repetition period of the fast extraction must be short to 1.3 second from the current period of 2.48 second for the improvement of the beam power. We exchanged a injection septum magnet which are located at the injection line from RCS to MR and its power supply in summer of 2016. It was necessary to exchange, because the previous injection septum system can not be operated with 1.3 second repetition. The development of the new injection septum magnet and its power supply in which the maximum repetition are 1Hz and the order od the leakage field are 10-4 of the gap field were completed in 2016. In this presentation, we will report the final results of its performance, e.g. the magnetic fields and stability of the output current and field, and the beam performance after installation in MR with the new injection magnet.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK034  
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MOPIK049 SPS Slow Extracted Spill Quality During the 2016 Run target, extraction, quadrupole, experiment 627
 
  • V. Kain, J. Bauche, P. Catherine, K. Cornelis, M.A. Fraser, L. Gatignon, C.M. Genton, B. Goddard, K. Kahle, M. Magrans de Abril, O. Michels, L.S. Stoel, F.M. Velotti
    CERN, Geneva, Switzerland
  
  The flux of particles slow extracted with the 1/3 integer resonance from the Super Proton Synchrotron at CERN should ideally be constant over the length of the extraction plateau, for optimum use of the beam by the fixed target experiments. The extracted intensity is controlled in feed-forward correction of the horizontal tune via the main SPS quadrupoles. The Mains power supply noise at 50 Hz and harmonics is also corrected in feed-forward by small amplitude tune modulation at the respective frequencies with a dedicated additional quadrupole circuit. In 2016 the spill quality could be much improved with respect to the situation of the previous year with more performant algorithms. In this paper the improved tools are described and the characteristics of the SPS slow extracted spill in terms of macro structure and typical frequency content are shown. Other sources of perturbation were, however, also present in 2016 which frequently caused the spill quality to be much reduced. The different effects are discussed and possible or actual solutions detailed. Finally, the evolution of the spill quality during characteristic periods in the 2016 run is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK049  
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MOPIK125 Multi-frequency AC LOCO: A Fast and Precise Technique for Lattice Correction lattice, quadrupole, optics, experiment 831
 
  • X. Yang, K. Ha, V.V. Smaluk, Y. Tian, L. Yu
    BNL, Upton, Long Island, New York, USA
  
  We developed a novel technique to improve the precision and shorten the measurement time of the LOCO (Linear Optics from Closed Orbits) method at NSLS-II [1]. This technique named AC LOCO is based on a sine-wave (AC) beam excitation via fast correctors typically installed at synchrotron light sources for the fast orbit feedback. The beam oscillations are measured by beam position monitors. The narrow band used for the beam excitation and measurement not only allows us to suppress effectively the beam position noise and also makes simultaneously exciting multiple correctors at different frequencies (multi-frequency mode) possible. We demonstrated at NSLS-II that the new technique provides better lattice corrections and achieves two minutes measurement time in the thirty-frequency mode.
[1] X. Yang et al., 'Fast and precise technique for magnet lattice correction via sine-wave excitation of fast correctors', Phys. Rev. Accel. Beams, vol. 20, p. 054001, 2017. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK125  
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MOPVA104 Physical Vapour Deposition of NbTiN Thin Films for Superconducting RF Cavities cathode, SRF, target, superconductivity 1102
 
  • S. Wilde, B. Chesca
    Loughborough University, Loughborough, Leicestershire, United Kingdom
  • E. Alves
    Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear, Lisboa, Portugal
  • N.P. Barradas
    Universidade de Lisboa, Instituto Superior Técnico, Bobadela, Portugal
  • A.N. Hannah, O.B. Malyshev, N. Pattalwar, S.M. Pattalwar, R. Valizadeh
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • G.B.G. Stenning
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  
  The production of superconducting coatings for radio frequency cavities is a rapidly developing field that should ultimately lead to acceleration gradients greater than those obtained by bulk Nb RF cavities. The use of thin films made from superconductors with thermodynamic critical field, HC>HCNb, allows the possibility of multilayer superconductor ' insulator ' superconductor (SIS) films and accelerators that could operate at temperatures above the 2 K typically used. SIS films theoretically allow increased acceleration gradient due to magnetic shielding of underlying superconducting layers [1] and higher operating temperature can reduce cost [2]. High impulse magnetron sputtering (HiPIMS) and pulsed DC magnetron sputtering processes were used to deposit NbTiN thin films onto Si(100) substrate. The films were characterised using scanning electron microscopy (SEM), x-ray diffraction (XRD), Rutherford back-scattering spectroscopy (RBS) and a four-point probe.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA104  
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TUPAB088 Wire Position System to Consistently Measure and Record the Location Change of Girders Following Ground Changes alignment, electron, undulator, electronics 1523
 
  • H. J. Choi, S.Y. Baek, H.-S. Kang, S.H. Kim, H.-G. Lee, S.B. Lee
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  Several parts that comprise the large scientific device should be installed and operated at the accurate three-dimensional location coordinates where they should be subjected to survey and alignment. The location of the aligned parts should not be changed in order to ensure that the electron beam parameters of PAL-XFEL remain stable and can be operated without any problems. As time goes by, however, the ground goes through uplift and subsidence, which consequently deforms building floors. The deformation of the ground and buildings changes the location of several devices including magnets and RF accelerator tubes, which eventually leads to the alignment errors. Once alignment errors occur with regard to these parts, the electron beam deviates from its course and beam parameters change accordingly. PAL-XFEL has installed the Hydrostatic Leveling System to measure and record the vertical change of buildings and ground consistently and systematically and the Wire Position System to measure the two dimensional changes of girders. This paper is designed to introduce the operating principle and design concept of WPS and discuss the current situation regarding installation and operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB088  
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TUPAB139 Design of an X-Band Photoinjector Operating at 1 kHz gun, cathode, solenoid, cavity 1659
 
  • W.S. Graves, A.C. Goodrich, M.R. Holl, N.J. O'Brien
    Arizona State University, Tempe, USA
  • V. Bharadwaj, P. Borchard
    Tibaray Inc., Stanford, USA
  • V.A. Dolgashev, E.A. Nanni
    SLAC, Menlo Park, California, USA
  
  A kHz repetition rate RF photoinjector with novel features has been designed for the ASU CXLS project. The photoinjector consists of a 9.3 GHz 4.5 cell standing-wave RF cavity that is constructed from 2 halves. The halves are brazed together, with the braze joint bisecting the irises and cells, greatly simplifying its construction. The cathode is brazed onto this assembly. RF power is coupled into the cavity through inline circular waveguide using a demountable TM01 mode launcher. The mode launcher feeds the power through 4 ports distributed azimuthally to eliminate both dipole and quadrupole field distortions. The brazed-in cathode and absence of complex power coupler result in a very inexpensive yet high performance device. The clean design allows the RF cavity to sit entirely within the solenoid assembly. The cathode gradient is 120 MV/m at 3 MW of input power. The cathode cell is just 0.17 RF wavelength so that laser arrival phase for peak acceleration is 70 degrees from zero crossing resulting in exit energy of 4 MeV. The photoinjector will operate with 1μs pulses at 1 kHz, dissipating 3 kW of heat. Details of the design are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB139  
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TUPIK117 Optimization of the Booster Notch System at Fermilab booster, kicker, proton, extraction 2002
 
  • S. Chaurize, C.C. Jensen, W. Pellico, I.L. Rakhno, K. Seiya, V.I. Sidorov, R. Tesarek, I.S. Tropin
    Fermilab, Batavia, Illinois, USA
  
  The Booster Beam Notch is a beam gap needed to allow extraction kickers to reach full field strength for a single turn extraction scheme. The Notch is created at injection energy by kicking 3 out of the 84 bunches to a dedicated absorber. The kicker voltage, pulse length and geometry of the absorber must be optimized to minimize the beam loss due to the notch creation. Beam studies, simulation and implementation as well as the optimization and improvement of the notch system will be discussed in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPIK117  
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TUPVA083 Analysis of Closed-Orbit Deviations for a First Direct Deuteron Electric Dipole Moment Measurement at the Cooler Synchrotron COSY closed-orbit, dipole, quadrupole, simulation 2271
 
  • V. Schmidt, A. Lehrach
    FZJ, Jülich, Germany
  
  This presentation investigates closed orbit influencing effects focusing on transverse orbit deviations. Using a model of the Cooler Synchrotron COSY at the Forschungszentrum Jülich implemented in the Methodical Accelerator Design program, several magnet misalignments are simulated and analyzed. A distinction is made between magnet displacements along the axes and rotations around them. Results are always analyzed for the uncorrected as well as for the orbit after the application of an orbit correction. Furthermore, the effect of displaced beam position monitors is simulated and a constraint resolution of their readout is considered. Besides magnet misalignments also field variations resulting from residual power supply oscillations are quantified for all types of magnets.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA083  
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TUPVA092 An Upgrade Scenario of RF System to Achieve 1.6 MW Beam Acceleration in J-PARC RCS cavity, resonance, acceleration, impedance 2297
 
  • M. Yamamoto, M. Nomura, T. Shimada, F. Tamura
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • K. Hara, K. Hasegawa, C. Ohmori, Y. Sugiyama, M. Yoshii
    KEK, Tokai, Ibaraki, Japan
  
  The J-PARC RCS has successfully accelerated 1 MW equivalent proton beam. However, the beam commissioning results and the particle tracking simulation suggest that the RCS has possibility to accelerate up to 1.6 MW beam. Since the power supply of the rf system almost reaches the limit under the condition of 1 MW beam, we consider the possible upgrade scenario of the rf system to accelerate 1.6 MW beam.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA092  
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TUPVA106 Solvements of the Asynchronization between the Bpms and Corrector Power Supplies in RCS of CSNS* software, EPICS, hardware, injection 2339
 
  • M.T. Li
    CSNS, Guangdong Province, People's Republic of China
  • Y.W. An, Y.D. Liu
    IHEP, Beijing, People's Republic of China
  
  Funding: Work supported by the National Natural Science Foundation of China ( Grant No. 11405189)
This paper studies the possible solvements of the asyn-chronization between the BPMs and Corrector Supplies in RCS of CSNS, to increase the accuracy of the response matrix measurement and the obit correction. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA106  
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WEZB1 Review and Prospects of RF Solid State Amplifiers for Particle Accelerators cavity, coupling, booster, vacuum 2537
 
  • P. Marchand
    SOLEIL, Gif-sur-Yvette, France
  
  Thanks to the growth of high power semiconductor technology, solid state power amplifier (SSPA) systems with several hundred kW RF power are now available for various accelerator fields. Following the successful development at 352 MHz that took place at SOLEIL in the 2000s, the technology was transferred to industry and SSPAs at different frequencies, power levels, and pulse lengths have been widely adopted. In this paper we report about the SOLEIL experience with SSPAs and review the used or planned SSPAs in other accelerator facilities.  
slides icon Slides WEZB1 [13.860 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEZB1  
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WEOCB1 HTS Magnets for Accelerator Applications dipole, operation, target, ion-source 2543
 
  • K. Hatanaka, M. Fukuda, S. Hara, K. Kamakura, M. Nakao, Y. Yasuda, T. Yorita
    RCNP, Osaka, Japan
  
  We have developed HTS magnets using the first generation wires for 15 years. HTS materials have larger temperature margin than LTS materials. Magnets can be operated around 20 K or higher temperature and can be conduction-cooled by cryocoolers. The cooling structure becomes simpler and the cooling power of a cooler is high. We expect to excite HTS magnets by AC or pulsed currents without quenching. After successful performance tests of prototype magnets, we fabricated two magnets for practical use, an air-core cylindrical magnet and a super-ferric dipole magnet. The former one is used to polarize ultra-cold neutrons and the latter is a switching dipole magnet to deliver accelerated beams to two target stations by time sharing. Their design and operational performance are presented  
slides icon Slides WEOCB1 [2.946 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEOCB1  
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WEPIK010 Commissioning Status of SuperKEKB Main Ring Magnet System operation, dipole, interaction-region, luminosity 2933
 
  • M. Masuzawa, T. Adachi, K. Egawa, T. Kawamoto, S. Nakamura, Y. Ohsawa, T. Oki, R. Sugahara, R. Ueki
    KEK, Ibaraki, Japan
  
  SuperKEKB is an electron-positron collider, which aims for the very high peak luminosity of 8x1035 cm-2s-1 , 40 times higher than that of KEKB. The SuperKEKB Main Ring (MR) system is very large, consisting of more than 1700 water-cooled normal-conducting magnets and about 900 air-cooled normal-conducting magnets. More than 400 magnets and power supplies were newly fabricated, tested and installed for SuperKEKB Phase I beam operation. The MR magnet system worked well, which contributed greatly to the smooth start-up of the MR. Commissioning status of the MR magnet system during SuperKEKB Phase I operation will be reported. Some problems resulting in beam abort will also be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK010  
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WEPIK012 Performance of SuperKEKB High Energy Ring Beam Abort System kicker, extraction, operation, sextupole 2939
 
  • T. Mimashi, Y. Enomoto, N. Iida, M. Kikuchi, K. Kodama, T. Mori, Y. Suetsugu
    KEK, Ibaraki, Japan
  • K. Abe
    Hitachi Power Semiconductor Device, Ltd., Hitachishi, Ibaraki, Japan
  • K. Kise, A. Tokuchi
    Pulsed Power Japan Laboratory Ltd., Kusatsu-shi Shiga, Japan
  
  New Beam abort system was installed at the Super-KEKB High Energy Ring. It was designed to enlarge the horizontal beam size at the beam extraction window to protect the extraction window, and it also makes the beam abort gap shorter. It consists of four horizontal kicker magnets, one vertical kicker to sweep the beam position in vertical direction, sextupole magnet to enlarge the horizontal beam size, one lambertson magnet, Ti extraction window and beam dump. Four horizontal kicker magnets and one vertical kicker magnet connects to the one power supply. The ceramic chambers cooled by the water are inserted in each kicker coils. The Abort system had been used during SuperKEKB phase 1 operation. This paper describes the performance of the abort system.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK012  
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WEPVA056 Development of an Induction Accelerator Cell Driver Utilizing 3.3 kV SiC-MOSFETs operation, induction, ion, synchrotron 3388
 
  • K. Okamura, K. Takayama
    KEK, Ibaraki, Japan
  • K. Takayama
    Sokendai, Ibaraki, Japan
  
  A novel synchrotron called an induction synchrotron (IS) was developed at KEK in 2006*. In the IS, charged particles are accelerated by pulse voltages driven by switching modulators employing high-speed semiconductor switches. As the switches are turned on and off by gate signals corresponding to the revolution frequency of the ion bunches, switching frequency reaches up to MHz order. The switching power supply (SPS) that generates bipolar pulses is one of the key technologies for the DA. The rating of SPS is roughly 2.5kV-20A-1MHz. To accomplish these requirements, we adopted 7 series connected Si-MOSFET for the switching devices of the 1st generation SPS. However it was too large and complicated for the future practical accelerator driver. Therefore we started to develop the next generation of SPS utilizing silicon carbide (SiC) devices, since they have inherently excellent properties such as high breakdown electric field high drift velocity, and high thermal conductivity**. In this paper, we describe the pulse switching test results of a prototype SiC-MOSFET and the test results of the prototype SPS.
* K. Takayama et al., Phys. Rev. Lett., 98, no.5, pp.054801(1)-054801(4) (2007).
**H. Okumura, Japanese J. Appl. Phys. vol.45, no.10A, pp. 7565-7586, Oct. 2006.
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA056  
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WEPVA057 High-Stability Magnet Power Supplies for SuperKEKB controls, feedback, operation, wiggler 3391
 
  • T. Oki, T. Adachi, S. Nakamura
    KEK, Ibaraki, Japan
  
  For the SuperKEKB, over 2,000 of magnet power supplies were recycled and around 300 of power supplies were newly fabricated. The newly fabricated power supplies include high performance power supplies: the main bending/wiggler magnet power supplies and the power supplies for final-focus superconducting magnets installed around an interaction point. High power tests were performed and the results are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA057  
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WEPVA060 Construction of the New Kicker Magnet Systems for PF-Advanced Ring kicker, injection, timing, impedance 3401
 
  • A. Ueda, S. Asaoka, T. Honda, S. Nagahashi, N. Nakamura, T. Nogami, H. Takaki, T. Uchiyama
    KEK, Ibaraki, Japan
  
  From July 2016 we are constructing a new beam transport (BT) line for the Photon Factory Advanced Ring (PF-AR). The new BT line was designed to transport the full energy 6.5-GeV beam directly from the LINAC, and the top up injection will be possible for the PF-AR. We designed and produced new kicker systems for this project. Three kicker magnets are used for the injection of the 6.5-GeV beam. The kicker magnets were designed as a window frame type ferrite core magnet. The magnetic fields of these magnets have been measured by the search coil method. We paid attention to evaluating eddy current losses of the metal coated ceramic duct in the magnetic field measurement.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA060  
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WEPVA061 High-Precision Pattern Power Supply of Kicker Magnet for Multi-Beamline Operation at SACLA operation, kicker, optics, electron 3404
 
  • C. Kondo, T. Fukui, T. Hara, T. Inagaki, Y. Otake, H. Tanaka
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  • K. Fukami
    JASRI/SPring-8, Hyogo-ken, Japan
  • H. Kawaguchi, Y. Kawaguchi
    Nichicon (Kusatsu) Corporation, Shiga, Japan
  • S. Nakazawa
    SES, Hyogo-pref., Japan
  
  At the Japanese XFEL facility SACLA, two XFEL beamlines (BL2 and BL3) and an injection line to the SPring-8 storage ring are switched by a kicker magnet. This multi-beamline operation has been tested since February 2015, however, CSR effects at a dogleg beam transport to BL2 with a deflecting angle of 3 degree currently limit the peak current of the electron beam. In order to suppress and cancel out the CSR effects, new beam optics is introduced for the dogleg in January 2017. In the new optics, a deflecting angle of the first kicker magnet is increased to 1.5 degree, which is three times larger than that of the old optics. To drive the kicker magnet, a high-power pattern power supply has been developed. To achieve the maximum output of 300 A and 1 kV, SiC MOSFETs are used as switching modules. The newly developed power supply can generate bipolar trapezoidal current waveforms at 60 Hz, and the amplitude and polarity of each waveform are controlled from pulse to pulse according to the beam energy and destination. The target stability is 10 ppm (peak to peak). In this presentation, we report the design and operation results of the newly developed pattern power supply.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA061  
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WEPVA063 Development of a New Pulsed Power Supply with the SiC-MOSFET kicker, flattop, pulsed-power, operation 3412
 
  • T. Takayanagi, K. Horino, J. Kamiya, M. Kinsho, T. Ueno, K. Yamamoto
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Mushibe, A. Tokuchi
    Pulsed Power Japan Laboratory Ltd., Kusatsu-shi Shiga, Japan
  
  A new power supply has been developed using linear transformer driver (LTD) technology that adopts SiC-MOSFETs and capacitors without a thyratron switch or a pulse forming network (PFN) device. A new power supply was also designed by connecting the SiC-MOSFETs and the LTD modules in parallel-series. The output voltage and current were 40 kV and 4 kA, respectively with a pulse width of 1500 nsec at a repetition rate of 25 Hz. Furthermore, by adjusting the correction module, to an output voltage per stage of 1/1000, a resolution of the voltage correction of ±0.1 % could be achieved. It was possible to output the current with arbitrary timing by using a trigger input for each LTD module. As a result, fine adjustment of the output voltage waveform was possible within the order of nanoseconds. This new power supply with high voltage output, cur-rent output, and very fast pulse operation is one of the most important key technologies for a kicker system using SiC-MOSFETs. The design and preliminary test results of this prototype power supply are presented here.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA063  
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WEPVA065 High Precision Magnet Powering for the SESAME Storage Ring controls, dipole, quadrupole, timing 3418
 
  • S.Kh. Jafar, I.A. Abid, A. Ismail
    SESAME, Allan, Jordan
  • E.O. Ari
    ASELSAN A.S., Ankara, Turkey
  • M.C. Bastos, T. Henschel
    CERN, Geneva, Switzerland
  • E.H. Yousefi
    ILSF, Tehran, Iran
  
  SESAME is the first synchrotron light source for the Middle East and is expected to start its operation mid-2017. It is composed of a 22 MeV Microtron, a 0.8 GeV booster synchrotron and a 2.5 GeV storage ring. The storage ring magnets and power supplies were designed, produced and validated under the framework of a collaboration between SESAME and CERN, supported by the European Commission. The power supply control strategy for the SESAME main ring follows the same model used in the LHC, where the power supplies are voltage sources bought from industry, to which a specially designed control unit and current sensors are added to implement a high precision current source. This strategy provides modularity, ease of maintenance, better control over performance and flexibility for the machine. Machine flexibility is further enhanced by individually powering the quadrupole magnets. In this paper, the powering strategy, design and validation of the magnet power supplies are described. Some of the challenges faced during those phases are discussed. Finally, performance results are presented, showing stability of the dipole power supply at nominal current of about 10 parts per million.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA065  
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WEPVA068 Design and Development of Accelerator Magnet Power Supply Based on SiC-MOSFET controls, interface, experiment, operation 3429
 
  • L. Yang, F. Long, Z.H. ZhenHua
    IHEP, Beijing, People's Republic of China
  
  SiC is a new type of semiconducting material with rapid development after the first generation and the second generation of semiconductor materials represented by silicon and gallium arsenide. SiC-MOSFET has a high frequency, high breakdown voltage, high temperature, radiation and many other points, suitable for future use in the accelerator magnet power supply. In this paper, the development and operation of a SiC-MOSFET-based accelerator magnet power supply are described in detail. The experiment results show that the performance of this power supply is superior to that of the same specification using Si-MOSFET. The power supply adopts one-way AC power supply, and the output stage adopts the full bridge circuit topology. The power device adopts C2M0040120D SiC-MOSFET, the working frequency is 30 kHz, the output current is ± 20A, the output voltage is ± 20V, and power is 400W. The Digital Power Supply Control Module (DPSCM) is used to realize high-precision digital closed-loop control, which supports on-line debugging and PC control. Power supply can be used to correct the magnet power, with high efficiency, high stability, and fast response and so on.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA068  
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WEPVA084 Performance of the PAL-XFEL High Precision Magnet Power Supplies controls, operation, status, site 3452
 
  • S.-H. Jeong, J.H. Han, Y.G. Jung, H.-S. Kang, D.E. Kim, H.-G. Lee, S.B. Lee, B.G. Oh, K.-H. Park, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  In the PAL-XFEL, 632 magnet power supplies (MPS) have been operated since 2016. High current unipolar MPSs(>100A) were configured buck mode with single power stack or two. The corrector MPSs for low current were the H-bridge type for bipolar current driving. The nine different types of MPS were installed for beam dy-namics in the PAL-XFEL machine. All MPSs had been tested and confirmed their performances before installa-tion. We described here the status of the MPS operation after installation on 2016.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA084  
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WEPVA085 Development of High Stabile Magnet Power Supply FPGA, interface, experiment, dipole 3455
 
  • K.-H. Park, J.H. Han, S.-H. Jeong, Y.G. Jung, D.E. Kim, H.-G. Lee, S.B. Lee, B.G. Oh, H.S. Suh
    PAL, Pohang, Kyungbuk, Republic of Korea
  
  A high stable magnet power supply (MPS) was devel-oped, which was a bipolar type with 200A of the output current at the 40V of output voltage. The MPS has been implemented by the digital signal processing technology using the DSP, FPGA, ADCs and so on. The output cur-rent stability of the MPS showed about 4 ppm peak-to-peak in a short term experiment at the 200A of its full output current. This paper shows the several design con-siderations being implemented to this high stable MPS. Some experimental data such as output stability, some waveforms and so on are given in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA085  
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WEPVA129 Arc-Flash Hazard and Protection for Electric Switchboard at NSRRC detector, site, photon, impedance 3571
 
  • T.-S. Ueng, Y.F. Chiu, C.K. Kuan, K.C. Kuo, Y.-C. Lin
    NSRRC, Hsinchu, Taiwan
  
  During the operation of electrical equipment the arc-flash accident could damage the equipment and endanger the working personnel. In order to prevent this type of accidents from happening and to minimize the damages, a delicate setup is being installed inside the electric switchboard for suppressing the accidents at the initial stage of arcing at NSRRC's power system. The installed device includes the arc sensor, the smoke detector, the high rupturing capacity fuse, the circuit breaker and the protection relay. Further improvement on preventing the arc-flash accidents is also under study.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA129  
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WEPVA130 Simulation the Iterative Learing Control Applied to the TPS Booster Ring Quadruple Magnet Power Supply controls, booster, simulation, feedback 3574
 
  • B.S. Wang, Y.-C. Chien, C.Y. Liu, K.-B. Liu, Y.S. Wong
    NSRRC, Hsinchu, Taiwan
  
  In the newly built TPS (Taiwan Photon Source), the AC power supplies of the Booster ring are required to operate in DC and AC mode with accuracy. Especially in AC mode, during the booster ramping process, the current ramping profiles of the Quadruple Magnets have to track that of the Dipole AC power supply with precise phase and amplitude to maximize the beam energy boost efficiency. At the present time, analog controllers are used for all the booster supplies and the tracking waveforms are generated externally in an EPICS control unit, converted to analog signals with precision Digital-to-Analog Converters (DACs) and then distributed to all the booster power supplies with differential signal pairs. In this paper, here we propose a hybrid iterative learning control algorithm combined with discrete PID feedback controller with the objective to eliminate the signal integrity problem inherent in analogue signals, so that boosting the beam energy might become more reliable. The proposed digital controller algorithm for the TPS booster ring magnet power supply and quadruple magnet load has been simulated with success.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA130  
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WEPVA131 Single-Inductor Bipolar Outputs Power Converters impedance, controls, electronics, operation 3577
 
  • Y.T. Li, C.Y. Liu, K.-B. Liu, B.S. Wang, Y.S. Wong
    NSRRC, Hsinchu, Taiwan
  
  In the circuit design for electronic products, bipolar power supply is often required. A non-isolated dual polarity power supply design is using two inductors to achieve this function. The number of inductors on the circuit would increase both the cost of products and space requirement. So the use of a single inductor bipolar power converter design can effectively reduce the cost and space to enhance product competitiveness. In this paper, the principle of a new single-inductor bipolar power converter will be described and tested to prove the feasibility of this design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA131  
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WEPVA132 Switching Power Supply Automatic Test System in Taiwan Photon Source radiation, photon, synchrotron, simulation 3580
 
  • Y.S. Wong, C.Y. Liu, K.-B. Liu, B.S. Wang
    NSRRC, Hsinchu, Taiwan
  
  This paper studies the use of a novel switching power supply automatic test system used in Taiwan photon source, Model 8000 is the ultimate solution for power electronic testing, the system includes a wide range of hardware choice such as AC/DC source, electronic loads, DMM, oscillate scope, noise analyzer and short/OVP tester. The ATS 8000 system uses a unique test command optimazation technology to prevent repetitive control commands from being sent to system hardware devices. This improve test speed dramatically and makes ideal choice for both high speed production applications as well as design verification.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA132  
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THPAB136 Kameleon - a Behavior-Rich, Non-Memoryless and Time-Aware Generic Simulator status, EPICS, controls, simulation 4040
 
  • R.N. Fernandes
    ESS, Lund, Sweden
  • N. Senaud
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  
  At ESS, thousands of devices will be used to control both the machine and end-station instruments. To enable ongoing development when access to these devices is not possible (for whatever the reason), Kameleon was implemented. It is a behavior-rich, non-memoryless and time-aware generic simulator that handles clients through a TCP/IP connection. An instance of this client is an EPICS IOC or a Tango Device Server. Kameleon consumes a user-defined file that describes the commands received from a client and, optionally, the reaction to these through statuses sent back to the client. Key features are: 1) Ubiquitous (runs in disparate platforms such as Windows and Linux). 2) Behavior-rich (predefined behaviors as well as user-defined). 3) Non-memoryless (the state of the simulation can be preserved between events and/or elapsed time). 4) Time-aware (statuses can be sent to the client either event-based or time-based). 5) Flexible (commands and statuses are described in a simple user-defined file - nothing is hard-coded in Kameleon). Kameleon will be used in a myriad of scenarios at ESS such as development of EPICS devices support, IOCs, OPI screens, testing of IOCs and alarm workflows.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB136  
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THPIK016 Status of the SIS100 RF Systems cavity, feedback, status, synchrotron 4136
 
  • H. Klingbeil, R. Balß, M. Frey, P. Hülsmann, A. Klaus, H.G. König, U. Laier, D.E.M. Lens, K.-P. Ningel
    GSI, Darmstadt, Germany
  
  Four different types of RF cavities are realized for the heavy-ion synchrotron SIS100 which is built in the scope of the FAIR (Facility for Antiproton and Ion Research) project. The standard acceleration is performed by ferrite cavities. Barrier bucket cavities will allow a pre-compression of the beam by means of moving barriers. Bunch compressor cavities are used to realize a rotation in longitudinal phase space by 90 degrees, thereby reducing the bunch length. Finally, a longitudinal feedback system reduces undesired beam oscillations. In contrast to the ferrite-loaded accelerating cavities, the last-mentioned three cavity types are based on magnetic alloy (MA) material. Depending on the type of the cavity system, the realization is done by - or in close collaboration with - different industrial companies and institutions. In this contribution, the realization status of all these synchrotron RF systems is summarized.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK016  
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THPIK065 Reliability Anlysis of 20kw Solid-State Amplifiers for Ciads simulation, controls, target 4245
 
  • P.H. Gao
    IMP/CAS, Lanzhou, People's Republic of China
  
  CIADS will apply the solid-state amplifier. 20KW solid-state amplifiers are the basis of RF systems. This talk model 20KW solid-state amplifiers with reliability block diagram(RBD). Through simulation, we find that the reliability function relative to redundancy approximates logarithm, but cost is linear growth. There is an optimal solution between redundancy and cost.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK065  
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THPIK090 352 MHz Tetrode RF Stations for Superconducting Spoke Cavities site, linac, controls, operation 4296
 
  • M. Jobs, K.J. Gajewski, V.A. Goryashko, H. Li, R.J.M.Y. Ruber, R. Wedberg
    Uppsala University, Uppsala, Sweden
  
  Two 352 MHz tetrode based RF stations for pulsed operation have been developed at the FREIA Laboratory, Uppsala University to validate the design and performance as RF source for the Spoke cavities in the first superconductive stage of the European Spallation Source(ESS) linear accelerator. The stations use dual TH595 tetrodes rated at 210 kW peak-power to provide a total power of 400 kW with a maximum pulse duration of 3.5 ms at 14 Hz repetition rate. Each tetrode is fed by a 10 kW solid state amplifier and the station is monitored by an internal control system with complete remote access. Extensive measurements have been performed on the RF performance, the power supplies as well as on the interlock systems. To conform to the specifications, special attention must be given for the response time of the tetrode power-supplies to acquire good quality RF output pulses. For the interlock system any shut-down condition due to tube malfunctioning or other sources must switch off the station in a controlled manner with minimal damage to any internal circuitry or to the tube itself whilst at the same time provide a fast discharge and cut-off of all relevant power supplies.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK090  
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THPIK116 Static Magnetization Properties of AL800 Garnet Material cavity, booster, injection, extraction 4370
 
  • J. Kuharik, R.L. Madrak, A.V. Makarov, W. Pellico, D. Sun, C.-Y. Tan, I. Terechkine
    Fermilab, Batavia, Illinois, USA
  
  A second harmonic tunable RF cavity is being developed for the Fermilab Booster. This device, which promises reduction of the particle beam loss at the injection, transition, and extraction stages, employs perpendicularly biased garnet material for the frequency tuning. The required range of the tuning is significantly wider than in previously built and tested tunable RF devices. As a result, the magnetic field in the garnet becomes fairly close to the gyromagnetic resonance line at the lower end of the frequency range. The chosen design concept of a tuner for the cavity cannot ensure uniform magnetic field in the garnet material; thus it is important to know the static magnetic properties of the material to avoid significant increase in the local RF loss power density. This report summarizes studies performed at Fermilab to understand variations in the magnetic properties of the AL-800 garnet material used to build the tuner of the cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK116  
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THPIK122 Methods of Phase and Power Control in Magnetron Transmitters for Superconducting Accelerators controls, injection, SRF, operation 4386
 
  • G.M. Kazakevich, R.P. Johnson, M.L. Neubauer
    Muons, Inc, Illinois, USA
  • V.A. Lebedev, W. Schappert, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Various methods of phase and power control in magnetron RF sources of superconducting accelerators intended for ADS-class projects were recently developed and studied with conventional 2.45 GHz, 1 kW, CW magnetrons operating in pulsed and CW regimes. Magnetron trans-mitters excited by a resonant (injection-locking) phase-modulated signal can provide phase and power control with the rates required for precise stabilization of phase and amplitude of the accelerating field in Superconducting RF (SRF) cavities of the intensity-frontier accelerators. An innovative technique that can significantly increase the magnetron transmitter efficiency at the wide-range power control required for superconducting accelerators was developed and verified with the 2.45 GHz magnetrons operating in CW and pulsed regimes. High efficiency magnetron transmitters of this type can significantly reduce the capital and operation costs of the ADS-class accelerator projects.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK122  
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THPIK128 Switching Magnet for Heavy-Ion Beam Separation simulation, flattop, magnet-design, target 4403
 
  • J.J. Hartzell, R.B. Agustsson, S.V. Kutsaev, A. Laurich, A.Y. Murokh, F.H. O'Shea, T.J. Villabona
    RadiaBeam, Santa Monica, California, USA
  • G. Leyh
    LOD, Brisbane, USA
  • E.A. Savin
    RadiaBeam Systems, Santa Monica, California, USA
  
  Funding: This work was supported by the United States Department of Energy SBIR Grant No. DE-SC0015124.
We present a design for a complete switching magnet system capable of deflecting 8-25 MeV/u heavy-ion beams by 10 degrees. The system can produce flat-top pulses from 1 to 30 ms with rise and fall times of less than 0.5 ms at a duty cycle of 3-91% into a heavily inductive load. As determined by physics needs, the operational parameters of this magnet place it between fast rising kicker magnets with short duration and slow rising (or DC) resistive magnets which are optimized for efficiency and current-based power loss. This magnet must operate efficiently with over 91% duty factor and have a modestly fast rise time. The resulting design uses a resistive magnet scheme, to optimize the current-based losses, that is pulsed using a new circuit to control the applied voltage. The magnet has a laminated, iron dominated, H-shaped core. Directly-cooled copper pancake coils energize the magnet. The modulator employs a novel, proprietary, over-voltage topology to overcome the inherent inductance and achieve the fast rise and fall times, switching to a precision DC supply to efficiently maintain the flattop without requiring voltage in excess of ±3 kV. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK128  
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