IPAC2016 - Table of Session: THPMW (Poster Session)

Paper	Title	Page
THPMW001	SuperKEKB Main Ring Power Supply System	3531
	S. Nakamura, T. Adachi, T. Oki, N. Tokuda KEK, Ibaraki, Japan
	The power supplies for magnets of KEKB main ring were recycled into SuperKEKB main ring. Several tests were performed for all of the power supplies to check the soundness. Some of the power supplies were improved to satisfy the requirements of optical design, and some of them were replaced by new power supplies. Most of the trim-coils were arranged with one of power supply per a coil in SuperKEKB. The total number of the power supplies is over 2000.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW001
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THPMW002	Power Supplies for Main Magnet of J-PARC Main Ring	3534
	S. Nakamura, Y. Kurimoto, Y. Morita, T. Shimogawa KEK, Ibaraki, Japan
	A large magnetic field ripple of the order of 10^-2 were observed at the first beam commissioning of J-PARC main ring in 2008, To eliminate the ripple, we had improved the magnet power supplies by reconstructing a trap-filter of 600 Hz and adopting an additional DCCT. We made differencial circuit and symmetrical wiring for all magnets. On the other hand, acceleration period was reduced from 2.5 s to 1.4 s for increasing the beam power with feedforward control. We summarize the improvements of the magnet power supplies in this paper.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW002
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THPMW003	Prototype Power Supply for SuperKEKB Final Focus Superconducting Corrector Magnets	3537
	T. Oki, T. Adachi, S. Nakamurapresenter, N. Ohuchi, N. Tokuda KEK, Ibaraki, Japan
	A prototype power supply for the SuperKEKB final focus superconducting corrector magnets was developed. The aiming specifications of the power supply are a DC rated output of ± 60 A ± 5 V bipolar, current setting resolution < 1 ppm, current stability < 5 ppm/8 h, temperature coefficient < 1 ppm/degree, and current ripple < 5 ppm, where the assumed magnet inductance and cable resistance are 0.2'8.7 mH and 75 mohms, respectively. High power tests were performed and expected results were obtained.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW003
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THPMW004	Conceptual Design for the HEPS Power Supply System	3540
	F. Long, Y.P. Liu, X. Qi, Z.H. ZhenHua IHEP, Beijing, People's Republic of China
	The High Energy Photon Source (HEPS) requires more than 1600 power supplies with various kinds of power rating. The power supply system includes power supplies for the Booster, Transport, and Storage Ring. The power supply for the Booster is based on 2Hz sinusoidal dynamic current output with 1000ppm current tracking requirement. And the power supply performance requirements of 10ppm long-term current stability are much more rigorous than commercial power supplies. The paper shows the conceptual design of the power supply system for the HEPS and possible solutions to critical technical challenges.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW004
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THPMW006	The Realization of the System for Rapid Detection of Bepc Ii Magnet Power Supply	3543
	S.Y. Chen, M.C. Zhan, J.X. Zhangpresenter IHEP, Bejing, People's Republic of China
	To quickly find the causes of the accelerator unstable or lost beam caused by magnet power supply in the Beijing Electron Positron Collider running, this set of rapid detection system for magnet power supply is developed. The stability of the system in 8 hours is about 0.005%, it can acquire over nearly 500 sets of magnet power supply current value most quickly in the 0.33ms time. All data is written to the MySQL database in real time，So as to be able to quickly troubleshoot magnet power supply problem through historical data analysis of database comparison.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW006
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THPMW007	The Design of a New State Space Digital Power Supply Prototype	3546
	K. Shu, J.X. Zhangpresenter IHEP, Beijing, People's Republic of China
	Based on system identification and DLQR methods, a self-adaptive power supply can be implemented by the new controller structure without any change in power main circuit. Now only some raw tests have been taken which show its stableness, but the State Space Digital Controlling may turned out to be with potential. It makes power supplies with different capability easy to interchange without any more effort on tuning their parameters according to their loads, and can be extended to accommodate MIMO systems.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW007
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THPMW008	Study of Digital Quench Detection System Based on System-on-Chip Technology	3549
SUPSS081	use link to see paper's listing under its alternate paper code
	J.X. Zhang, X.J. Bian, F.S. Chen, J. Cheng, F. Long IHEP, Beijing, People's Republic of China
	Quench detection system is a key component of the quench protection system for superconducting magnets. According to operating experience of the quench protec-tion system for BEPCII interaction region superconduct-ing magnets and study in depth on the development process of System-on-Chip, we are establishing a set of digital quench detection system with high integration density and favourable portability by integrating IP cores, custom modules and developing embedded soft-ware on one piece of FPGA chip (Cyclone V SX SoC). The main components of this system are: 1.Hard proces-sor system based-on ARM Cortex-A9 architecture inte-grated with embedded operating system (Linux).2.Floating point DSP based-on soft IP core.3.Function Module Portion designed for different functions such as communicating with front end ADC, timing control, etc. This paper introduces the research progress of the system. *D.F.Orris, S.Feher, M.J.Lamm, J.Nogiec, S.Sharonov, M.Tartaglia, J.Tompkins, et al.," A digital quench detection system for superconducting magnets", Proceedings of PAC'99, New York, 1999.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW008
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THPMW009	Data Mining Applied in Management of Heavy Ion Accelerator Power Supplies	3552
SUPSS104	use link to see paper's listing under its alternate paper code
	H. Zhang, D.Q. Gao, Q.S. Qian, P. Sun IMP/CAS, Lanzhou, People's Republic of China
	Scientific and effective management of power supplies could reduce the failure rate and improve the efficiency of the heavy ion accelerator. This paper shows how to introduce data mining into the intelligent management of heavy ion accelerator power supplies. A web site platform was developed to collect raw data. The raw data includes many kinds of information about one power supply's life cycle form its development to operation. Among which the failure records are particularly important. According to the attribute that the records are mostly nominal data, R software and SQL Server 2008 Business Intelligence Development Studio were chose as mining tools. R soft-ware was used to carry on the statistical characteristic analysis and SQL Server 2008 Business Intelligence Development Studio was used to find out association rules. Useful conclusions have been drawn. This work has laid a solid foundation to further establish the intelligent management system of heavy ion accelerator power supplies.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW009
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THPMW010	PAL-XFEL Dipole Magnet Power Supplies	3555
	S.-H. Jeong, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea
	Total 632 magnet power supplies (MPSs) are under operating in PAL-XFEL. These magnet power supplies can be categorized as three types - corrector, quadrupole and dipole. The dipole MPSs are ranging from 110A/80V bipolar PS to 310A/200V unipolar PS. The long term stability of bipolar power supply is 10 ppm with 250 A 40V output for gun solenoid. The three types of dipole MPSs are developed for PAL-XFEL. Precise measurement results show that all power supplies meet the required specifications. The long term operation stability of the MPSs are appeared to be sufficient for a stable operation of the PAL-XFEL.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW010
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THPMW011	Magnet Power Supplies Performance at the PLS-II Storage Ring	3558
	S.-C. Kim, A. Ahn, J.M. Kim, K.R. Kim, C.D. Park, J.C. Yoon PAL, Pohang, Kyungbuk, Republic of Korea
	Funding: This work is supported by the Ministry of science, ICT and Future Planning, Korea. Magnet power supplies(MPS) are operating unipolar(bending, main-quadrupole, sextupole and septum) and bipolar(slow corrector, fast corrector, aux-quadrupole and skew) at the PLS-II storage ring(SR). Unipolar MPSs maintain stability, and bipolar MPSs maintain stability, have best resolution performance total operation region including zero-crossing during beam operation. Slow and fast corrector MPSs for beam correction have good step response characteristics. In this paper, we present the improve activity and performance of the PLS-II SR MPS.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW011
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THPMW012	The Fast Interlock Controller for High Power Pulse Modulator at PAL-XFEL	3561
	S.H. Kim, H.-S. Kang, K.H. Kim, S.J. Kwon, H.-S. Lee, S.S. Park, Y.J. Park PAL, Pohang, Kyungbuk, Republic of Korea I.S. Ko POSTECH, Pohang, Kyungbuk, Republic of Korea
	Funding: This work is supported by Ministry of Science, ICT(Information/Communication Technology) and Future Planning. The modulator control system for PAL-XFEL consists of a PLC unit (Programmable Logic Controller) and FPSCM (Fast Pulse Signal Conditioning Module). There are two kinds of interlock, which are dynamic and static interlocks categorized as analogue monitor and control signals, digital monitor and control signals. In case of dynamic interlocks, the internal interface of the PLC unit had to be modified due to operating within 10 ms time response from the interlock event. The fast pulse signal conditioning module is adopted for preconditioning the fast pulse and DC signals that inherently have high noise levels generated from a beam voltage, a beam current and EOLC current. Those EM (Electro-Magnetic) noises are generated by thyratron switching. The amplitude of the thyratron noise is large which causes the problem at the control devices, frequently. In this paper, the test results of the interlock control system will be described.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW012
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THPMW013	Development of PAL-XFEL Magnet Power Supply	3564
	K.-H. Park, S.-H. Jeong, Y.-G. Jung, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, B.G. Oh, H.S. Suh PAL, Pohang, Kyungbuk, Republic of Korea W.S. Choi POSTECH, Pohang, Kyungbuk, Republic of Korea
	All magnets and magnet power supplies (MPS) for PAL-XFEL had been installed at the site. The all MPSs had been tested with the magnets at the field. The total number of assembled MPSs was amounted to 688, which were grouped into nine categories by their power capacities in order to reduce the manufacturing cost and make maintenance easy. The general specifications for the MPS for the PAL- XFEL were summarized. The design configurations of the MPS were also explained to satisfy the given requirements such as the output current stability. The test results of performances of the MPSs for corrector magnets were described here.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW013
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THPMW014	High Voltage Supply for Particle Accelerators Based on Modular Multilevel Converters	3567
	P. Asimakopoulos, K.D. Papastergioupresenter CERN, Geneva, Switzerland
	Modular Multilevel Converters brought a paradigm shift in very high voltage and high power applications with the replacement of high voltage valves by multiple series-connected, low-voltage modules that can be by-passed in case of fault. The reliability and precision in output waveform generation make it a potential candidate in accelerator power conversion. This work demonstrates operation of MMC-based high voltage magnet supply for a transfer line application. The output current regulation precision and the total power losses are examined. Finally, the challenge of the control optimization combined with the passive components dimensioning is highlighted. * R. Marquardt and A. Lesnicar, "An innovative modular multilevel converter topology suitable for a wide power range", in Proc. IEEE Bologna Power Technol. Conf., Jun. 2003, pp. 1-6.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW014
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THPMW015	A Digtal Regulation Controller Prototype for the TPS Booster Power Supplies	3570
	B.S. Wang, Y.-C. Chien, Y.T. Li, C.Y. Liu, K.-B. Liu, Y.S. Wongpresenter 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 present, analog current commands for all the booster power supplies with relative phase and amplitude information are generated externally. The current ramping profiles are pre-calculated and calibrated in a centralized manner. In this paper, an auto-calibration process using Curve-Fitting algorithm is proposed. In the new process, the current ramping profile data is first stored digitally in each power supply and then outputted to each power supply with a synchronous trigger signal in hope to eliminate the signal integrality problem inherent in analog signals , so that the beam energy boost up could be more reliable and efficient. The new proposed method has been implemented and tested successfully and will be applied to the booster power supplies to test its performance in the future.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW015
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THPMW016	Dipole Power Supply for the Storage Ring of Taiwan Photon Source	3573
	C.Y. Liu, Y.-C. Chien, K.-B. Liu, B.S. Wang, Y.S. Wongpresenter NSRRC, Hsinchu, Taiwan
	The performance of the TPS dipole power supply for the dipole magnets in the TPS storage ring is important. As the output current of the power supply follows the beam current for operation at 3 GeV, the power supply must deliver enormous energy to the dipole magnets. The target energy corresponds to 700 A at 800 V. The dipole supply for the TPS storage ring is a unipolar switching power supply, also called a bulk power supply. The TPS dipole power supply modulates the output current regulated by the PWM signal. The switching device is an IGBT module working at frequency 2 kHz. A PID controller and a DCCT are used for feedback control of the output current. We obtained an optimal control gain with long-term stability of the output current under 10 ppm. The performance of the TPS storage ring dipole supply can thus satisfy the TPS requirement. The beam current generates 3 GeV in the TPS ring. This paper reports the excellent results.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW016
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THPMW017	Phase Shifter Power Supply Design	3576
	Y.T. Li, K.-B. Liu, B.S. Wang, Y.S. Wongpresenter NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source is an interdisciplinary project. The phase-shift magnet is used to connect the radiation phase between two EPU48s. The power supply for this phase-shift magnet is a key element to determine the phase shift quality. In this report, the theory of the designed circuit is firstly introduced, and then a comparison simulation result and actual measurement is summarized to prove the correctness of theoretical analysis and circuit design.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW017
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THPMW018	Simulation a High Step-up DC-DC Converter for Accelerator	3579
	Y.S. Wong, Y.-C. Chien, C.Y. Liu, K.-B. Liu, B.S. Wang NSRRC, Hsinchu, Taiwan
	This paper simulation a novel high step-up DC-DC high circuit architecture for storage ring quadrupole and sextupole power supply DC bus voltage. The input source is a low voltage photovoltaic energy through proposed circuit to increase high output voltage system. This volt-age can be as DC bus of quadrupole and sextupole power supply. The part of the circuit has a power switch, isolated transformer inductors, switched capacitors and diodes. This proposed circuit has the advantages of galvanic isolation function, small transformer and high step-up gain and efficiency. Continuous conduction mode (CCM) operation principles are discussed in this paper. Finally, Simplis software has been used for simulation a 24 Vdc step-up to 200 Vdc and 100 w DC-DC converters. high step-up, switched capacitor, photovoltaic
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW018
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THPMW019	Concept and Design of the Injection Kicker System for the FAIR SIS100 Synchrotron	3582
	I.J. Petzenhauser, U. Blell, P.J. Spiller GSI, Darmstadt, Germany L.O. Baandrup, H. Bach, N. Hauge, K.F. Laurberg Danfysik A/S, Taastrup, Denmark G. Blokesch, M. Osemann Ampegon PPT GmbH, Dortmund, Germany
	The SIS100 synchrotron at GSI, Germany is designed for acceleration of protons and ions. For the injection into the synchrotron a kicker magnet system, which consists of 6 ferrite kicker magnet modules, installed in one vacuum tank with a required vacuum quality better than 10-9 Pa, will be needed. The magnetic field should be 118 mT in a 65 mm gap. These kicker magnet modules will be supplied with 6 separate pulser circuits. Each pulser has to produce a pulse current of up to 7 kA at a PFL (pulse forming line) voltage of 80kV at an impedance of 5.7 Ohm. The rise time has to be 130 ns and the variable pulse length is between 0.5 to 2.0 μs. The design concept for this kicker system from Ampegon PPT and DANFYSIK and the specific challenges will be described.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW019
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THPMW020	Solid-state Compact Kicker Pulsar using Strip-line Type Blumlein with SIC-MOSFET in Spring-8	3585
	C. Mitsuda, T. Honiden, K. Kobayashi, T. Kobayashi, S. Sasaki JASRI/SPring-8, Hyogo-ken, Japan N. Sekine Sekine Electric Works Co. Ltd, Osaka, Japan
	In the case of handling the electron beam by bunch-by-bunch and turn-by-turn with a kicker at the SPring-8, the performances required to a pulsar are short pulse width (<40ns) and high repetitions (>208kHz). In order to achieve these specifications, the short pulsed high voltage output and the utilization of the solid-state switch is necessary for an inductance load. In order to suppress the supplied voltage as low as as possible, it is an important feature to realize the extremely small-sized pulsar to be set near the kicker. On the basis of the experiences in developing the solid-state pulsar of 400ns/2kV using Si-MOSFET, combination of the SiC-MOSFET and the strip-line type Blumlein pulse forming network (BPFN) was applied to the prototype driver to achieve a shorter pulse and higher power than Si-type driver. The completed pulsar accomplished a compact size (external dimensions; 300(H)x400(W)x400(D)mm). Furthermore, the targeted short-pulsed high voltage output of 123ns/12kV was obtained by 6 BPFNs serial connection to the load inductance of 800 nH. The BPFN detailed design to enable the compact size, high reliability and stability at high repetitions will be reported. C.Mitsuda et al., Proc. of IPAC2013, MOPAWA003
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW020
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THPMW021	Performance of a Compensation Kicker Magnet for J-PARC Main Ring	3588
	T. Sugimoto, K. Ishii, H. Matsumoto, T. Shibata KEK, Ibaraki, Japan K. Fan HUST, Wuhan, People's Republic of China
	Four lumped-type kicker magnets have been equipped in the J-PARC MR (Main Ring) to inject 8 proton bunches. To increase beam power, the bunch length will be increased up to 350 ns that will restricts the rise time of the injection kicker to be less than 250 ns. We have already developed a method to improve the rising time to 200 ns. However, two reflection pulses are appeared at the waveform tail, which will kick the circulating bunches and induce coherent oscillation leading to beam loss. To compensate reflection pulses, we decide to install two new lumped-type kicker magnets, which are excited independently making operation flexible. A ceramic vacuum duct with TiN coating is inserted in the compensation kickers. Magnetic field measurement and coupling impedance measurement have been carried. In this paper, the results of both these measurements and performance study using proton beam will be discussed. T.Sugimot et.al, "Upgrade of the Injection Kicker System for J-PARC Main Ring", MOPME069, IPAC14, Dresden, Germany, 2014.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW021
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THPMW022	The RF Design of a Compact, High Power Pulse Compressor with a Flat Output Pulse	3591
SUPSS105	use link to see paper's listing under its alternate paper code
	P. Wang, H.B. Chen, J. Shi TUB, Beijing, People's Republic of China I. Syratchev, W. Wuensch, H. Zha CERN, Geneva, Switzerland
	An X-band, high-power pulse compressor, which can produce a flat pulse and a power gain of 4.3, has been designed. The device is compact, with the dimensions of within 1m, and is designed for CLIC first energy stage based on klystrons. We also discuss about a two stage pulse compressor with power gain of 9.18, which may be a candidate of the X-FEL using CLIC X-band linacs and klystrons with low peak power.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW022
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THPMW023	Simulation of an Accelerator Pulse Power Supply with an Active Rectifier Using SIMPLORER	3594
SUPSS106	use link to see paper's listing under its alternate paper code
	F.J. Wu, D.Q. Gao, M. Li IMP/CAS, Lanzhou, People's Republic of China
	In this paper, a simulation model of an accelerator pulse power supply with an active rectifier (voltage-type SVPWM rectifier) was set up based on the C-Model function in SIMPLORER 8.1, which is a simulation software belonging to the ANSOFT corporation. We introduce a SVPWM rectifier into an accelerator pulse power supply to solve its problems such as low input power factor, a large number of AC current harmonics and instable DC bus voltage due to the diode or thyristor rectifier used in it now. Components of control strategies developed in C language were built up and inserted into the simulation project. The simulation results indicate that an accelerator pulse power supply with a SVPWM rectifier can solve the problems above well. For all the control strategies were developed in C language, they can be transplanted into the digital signal processor (DSP) nearly without change for the prototype controlling. So it provides a basis for development of the experimental prototype.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW023
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THPMW024	Phase Tuning Results of the Waveguide Network System at Pal	3597
	K.H. Kim, S.H. Kim, H.-S. Lee, S.S. Park, Y.J. Park PAL, Pohang, Republic of Korea
	We report the results of the phase tuning of the waveguide network system with the C-clamp tool and the resonance frequency tuning for the SLAC energy doubler. The high power waveguide network which dividing and feeding the power to the four accelerating structures. The phase length is adjusted within ± 0.25 degrees with a transmission phase measuring method. The resonant frequency range for the SLAC energy doubler is 2856 MHz ± 5 kHz, but a target range is 2856 MHz ± 1 kHz. We measured the phase length and an amplitude with a vector network analyser. The test setup consists of a SLED, a waveguide network, directional couplers, phase stable cables. All components of the waveguide networks were manufactured at VITZRO TECH and tested at the accelerator tunnel in the Pohang Accelerator Laboratory (PAL).
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW024
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THPMW027	Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology	3600
	C.A. Martins ESS, Lund, Sweden M. Collins, A. Reinap Lund Technical University, Lund, Sweden
	A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW027
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THPMW028	High Voltage Performance of Surface Coatings on Alumina Insulators	3603
	A. Adraktas, M.J. Barnes, H.A. Day, L. Ducimetièrepresenter CERN, Geneva, Switzerland
	Alumina insulators and dielectrics are required for a variety of applications in particle accelerators. Their use in high voltage devices, both pulsed and DC, is well established as both insulation and mechanical support. In accelerator equipment the alumina is usually used in ultra-high vacuum and hence charge accumulation can be an issue, especially when the alumina is near to the beam. To address challenges regarding surface flashover and high secondary electron yield in high intensity accelerators, surface treatments and coatings are being considered. This paper presents predictions of the influence of surface coatings, on alumina insulators, upon electric field.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW028
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THPMW029	Feasibility Study of the Fast SPS Ion Injection Kicker System	3607
	A. Ferrero Colomo, P. Burkel, D. Comte, L. Ducimetièrepresenter, T. Kramer, V. Senaj, L. Sermeus, F.M. Velotti CERN, Geneva, Switzerland
	As part of the upgrade project for ions the rise time of the injection kicker system into the SPS needs to be improved. The changes being studied include the addition of a fast Pulse Forming Line parallel to the existing Pulse Forming Network for the fast kicker magnets MKP-S. With the PFL an improved magnetic field rise time of 100 ns is targeted. Two different configuration utilizing a 2nd thyratron or two fast diode stacks have been outlined in the past. This paper presents the recent progress on the analogue circuit simulations for both options as well as measurements carried out on a test system. Modelling, optimization and simulation of the entire system with diodes and a second configuration with two thyratron switches are outlined. Measurement results are given and the feasibility of the upgrade is discussed.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW029
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THPMW030	Studies of Impedance-related Improvements of the SPS Injection Kicker System	3611
	M.J. Barnes, A. Adraktas, M.S. Beck, G. Bregliozzi, H.A. Day, L. Ducimetièrepresenter, J.A. Ferreira Somoza, B. Goddard, T. Kramer, C. Pasquino, G. Rumolo, B. Salvant, L. Sermeus, J.A. Uythoven, L. Vega Cid, W.J.M. Weterings, C. Zannini CERN, Geneva, Switzerland F.M. Velotti EPFL, Lausanne, Switzerland
	The injection kicker system for the SPS consists of sixteen magnets housed in a total of four vacuum tanks. The kicker magnets in one tank have recently limited operation of the SPS with high-intensity beam: this is due to both beam induced heating in the ferrite yoke of the kicker magnets and abnormally high pressure in the vacuum tank. Furthermore, operation with the higher intensity beams needed in the future for HL-LHC is expected to exacerbate these problems. Hence studies of the longitudinal beam coupling impedance of the kicker magnets have been carried out to investigate effective methods to shield the ferrite yoke from the circulating beam. The shielding must not compromise the field quality or high voltage behaviour of the kicker magnets and should not significantly reduce the beam aperture: results of these studies, together with measurements, are presented. In addition results of tests to identify the causes of abnormal outgassing are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW030
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THPMW031	Current and Future Beam Thermal Behaviour of the LHC Injection Kicker Magnet	3615
	H.A. Day, M.J. Barnes, L. Ducimetièrepresenter, L. Vega Cid, W.J.M. Weterings CERN, Geneva, Switzerland
	During Run 1 of the LHC the injection kicker magnets caused occasional operational delays due to beam induced heating with high bunch intensity and short bunch lengths. Significant upgrades were carried out to the injection kicker magnets during long shutdown 1, including a new design of beam screen to reduce the beam induced heating. Nevertheless these kicker magnets may limit the performance of HL-LHC unless additional, mitigating, measures are taken. Hence extensive simulations have been carried out to predict the distribution of the beam induced power deposition within the magnet and detailed thermal analyses carried out to predict the temperature profiles. To benchmark the simulations the predicted temperatures are compared with observables in the LHC. This paper reports on observations of the thermal behaviour of the magnet during run 2 of the LHC, with 25ns beam. In addition the measurement data is used to extrapolate temperature rise for the beam parameters expected for high-luminosity LHC.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW031
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THPMW032	Measurements on Magnetic Cores for Inductive Adders with Ultra-Flat Output Pulses for CLIC DR Kickers	3619
	J. Holma, M.J. Barnes, L. Ducimetièrepresenter CERN, Geneva, Switzerland
	The CLIC study is investigating the technical feasibility of an electron-positron collider with high luminosity and a nominal centre-of-mass energy of 3 TeV. The CLIC pre-damping rings and damping rings (DRs) will produce ultra-low emittance beam with high bunch charge. To avoid beam emittance increase, the DR kicker systems must provide extremely flat, high-voltage, pulses. The specifications for the DR extraction kickers call for 160 ns duration flattop pulses of ±12.5 kV, with a combined ripple and droop of not more than ±0.02 % (±2.5 V). An inductive adder is a very promising approach to meet the specifications. Two five layer, 3.5 kV, prototype inductive adders have been built at CERN, and used to test passive and active analogue modulation methods to compensate droop and ripple of the output pulses. Recently, magnetic core materials and full-scale magnetic cores have been evaluated for the 12.5 kV prototype inductive adders. These results are presented in this paper and conclusions are drawn concerning the design of the full-scale prototypes.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW032
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THPMW033	Operational Experience of the Upgraded LHC Injection Kicker Magnets	3623
	M.J. Barnes, A. Adraktas, G. Bregliozzi, S. Calatroni, H.A. Day, L. Ducimetièrepresenter, B. Goddard, V. Gomes Namora, V. Mertens, B. Salvant, J.A. Uythoven, L. Vega Cid, W.J.M. Weterings, C. Yin Vallgren CERN, Geneva, Switzerland
	During Run 1 of the LHC the injection kicker magnets caused occasional operational delays due to beam induced heating with high bunch intensity and short bunch lengths. In addition, sometimes there were also sporadic issues with microscopic unidentified falling objects, vacuum activity and electrical flashover of the injection kickers. An extensive program of studies was launched and significant upgrades were carried out during long shutdown 1. These upgrades include a new design of a beam screen to both reduce the beam coupling impedance of the kicker magnet, and to significantly reduce the electric field associated with the screen conductors, hence decreasing the probability of electrical breakdown in this region. In addition new cleaning procedures were implemented and equipment adjacent to the injection kickers and various vacuum components were modified. This paper presents operational experience of the injection kicker magnets during Run 2 of the LHC and assesses the effectiveness of the various upgrades.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW033
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THPMW034	Review on the Effects of Characteristic Impedance Mismatching in a Stripline Kicker	3627
	C. Belver-Aguilar, M.J. Barnes, L. Ducimetièrepresenter CERN, Geneva, Switzerland
	A stripline kicker operates as two coupled transmission lines, with two TEM operating modes, known as odd and even modes. The characteristic impedance of these two modes is generally different, both only tend to the same value either when the electrodes are widely separated or when the electrodes are very close to the beam pipe wall. In all other cases, the even mode characteristic impedance is always higher than the odd mode characteristic impedance. The specifications required for a kicker operating in a low emittance ring are usually very challenging. In this situation it is desirable to match the even mode characteristic impedance of the striplines to the resistance of their termination. However a mismatched odd mode impedance can significantly influence the striplines performance. This paper presents predictions for the influence of the odd mode characteristic impedance upon the contribution of each field component, electric and magnetic, to the deflection angle. In addition, the variation of the characteristic impedance and field homogeneity with frequency are presented.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW034
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THPMW035	Considerations on an Upgrade Possibility of the LHC Beam Dump Kicker System	3631
	M.A. Fraser, W. Bartmann, C. Bracco, L. Ducimetièrepresenter, B. Goddard, T. Kramer, V. Senaj CERN, Geneva, Switzerland
	The LHC Beam Dump System (LBDS) is designed to safely dispose the circulating beams over a wide range of energy from 450 GeV up to 7 TeV, where the maximum stored energy is 362 MJ per beam. One of the most critical components of the LBDS are the extraction kickers that must reliably switch on within the 3 us particle-free abort gap. To ensure this functionality, even in the event of a power-cut, the power generator capacitors remain charged and hence the Gate Turn-Off (GTO) switch stack has to hold the full voltage throughout beam operation. The increase of the LHC collision energy to 13 TeV has increased the voltage levels at the GTO stacks and during re-commissioning an increased rate of high-voltage (HV) related issues at the level of the GTO stack was observed. Different solutions have been analysed and an improved GTO stack will be implemented. This paper also outlines the benefit of adding more kicker magnets to improve the voltage hold off issues and to improve the tolerance to missing kickers during extraction.
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THPMW037	Pulsed Power Systems for ESS Klystrons	3634
	I. Roth, M.P.J. Gaudreau, M.K. Kempkespresenter Diversified Technologies, Inc., Bedford, Massachusetts, USA J. Domenge Sigma Phi Electronics, Wissembourg, France J.L. Lancelot Sigmaphi, Vannes, France
	Diversified Technologies, Inc. (DTI) is building three long pulse solid-state klystron transmitters to meet spallation source requirements. Two of the three will be installed at CEA Saclay and the National Institute of Nuclear and Particle Physics (IN2P3) in 2015, to be used as test stands for the European Spallation Source (ESS), The third system will be installed at Oak Ridge National Laboratory (ORNL) for the Spallation Neutron Source (SNS).
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THPMW038	Prototyping of the ALS-U Fast Kickers	3637
	G.C. Pappas, S. De Santis, J.-Y. Jung, T.H. Luo, C. Steier, C.A. Swensonpresenter, W.L. Waldron LBNL, Berkeley, California, USA
	Prototyping of major components for the ALS-U kickers is in progress. A tapered stripline kicker has been built for installation and testing in the ALS, and multiple modulator options to meet the fast rise time required for swap out injection have been considered. High voltage feedthroughs that are matched into the multi GHz range are also being studied. * Pappas et al., "Fast Kicker Systems for ALS-U", Proc. of IPAC'14, Dresden, Germany, MOPME083.
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THPMW040	Multipactor Discharge in a Resonator as an Active Switch for RF Pulse Compression	3640
	J.Q. Qiu, S.P. Antipovpresenter, C.-J. Jing, A. Kanareykin Euclid Beamlabs LLC, Bolingbrook, USA E.V. Ilyakov, I.S. Kulagin, S.V. Kuzikov, A.A. Vikharev IAP/RAS, Nizhny Novgorod, Russia
	Funding: Phase I DOE SBIR Pulse compression is a method of increasing the peak power of the microwave pulse at the expense of its length. Over the years a number of pulse compressors had been demonstrated with some being bulky but efficient, like the binary pulse compressor and other being compact but less efficient, like SLED-II. An active pulse compressor had been proposed to increase the efficiency and compression ratio which relies on a high power active switch. Currently there are no practical switches that can work reliably with 100 s of megawatts of power. Most of the switches (ferroelectric, plasma-based, semiconductor) are limited by the breakdown strength of various dielectric inserts. In this paper we report on an active switch development which is based on a pure copper resonator and controlled by a single-side multipactor discharge at a metallic wall in the presence of a resonant DC magnetic field and a normal to metal rf field. The discharge is ignited by external rf power produced by inexpensive 2.45 GHz, 1-5 kW magnetrons.
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THPMW041	Single Crystal Diamond X-ray Lens Development	3643
	S.P. Antipov, S.V. Baryshev, S. Baturin, R.A. Kostin Euclid TechLabs, LLC, Solon, Ohio, USA T.C. Irving, A. Olga CSSRI, Chicago, USA S. Stoupin ANL, Argonne, Ilinois, USA
	Funding: Phase I DOE SBIR The next generation light sources such as diffraction-limited storage rings and high repetition rate free electron lasers (FELs) will generate x-ray beams with significantly increased peak and average brilliance. These future facilities will require x-ray optical components capable of handling large instantaneous and average power densities while tailoring the properties of the x-ray beams for a variety of scientific experiments. In this paper we report on research and development of a single crystal diamond compound refractive lens. Diamond is the best material for high heat load applications. Moreover single crystal lens preserves coherence of the x-ray beam because scattering from grain boundaries, voids and impurities, typical for current beryllium lenses is minimized. A set of two-dimensional single crystal diamond lenses had been fabricated by fs-laser cutting and tested at Advanced Photon Source (Argonne).
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THPMW042	Overview of Driver Technologies for Nanosecond TEM Kickers	3645
	A.K. Krasnykh SLAC, Menlo Park, California, USA
	Funding: Work supported in part by US Department of Energy under contract DE-AC02-76SF00515 and in part by US Department of Energy under contract DE-AC02-06CH11357 Overview of modern methods, circuits, and practical realizations for multi MW peak power pulsers will be presented. All used pulser components are manufactured by the US national industry and they are available for design and pulser fabrication. Two concepts will be discussed: (1) an approach is based on assistance of a nonlinear transmission line with ferromagnetic media and (2) an approach is based on assistance of special diodes which are working in a specific mode of operation. In both approaches the nonlinear characteristic of switching media (ferromagnetic and solid state plasma) are employed in final stage of the pulser to form the multi MW level nanosecond pulses.
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THPMW043	Observation of Beam-induced Abort Kicker Ferrite Heating in RHIC	3648
	C. Montag, L. Ahrens, K.A. Drees, H. Hahn, J.-L. Mi, C. Pai, J. Sandberg, T.C. Shrey, P. Thieberger, J.E. Tuozzolo, W. Zhang BNL, Upton, Long Island, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. During the FY 2013 RHIC polarized proton run, deterioration of the abort kicker system was observed. The reduced kicks resulted in quenching the superconducting quadrupole Q4 downstream of the beam dump. Frequent re-tuning of the modulator wave form temporarily mitigated the effect, which worsened during the course of the run. Beam-induced heating of the kicker ferrites was evenutally identified as the root cause of this behavior. We report our observations and discuss modifications to the kickers.
DOI •	reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW043
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Paper

Title

Page

SuperKEKB Main Ring Power Supply System

3531

S. Nakamura, T. Adachi, T. Oki, N. Tokuda
KEK, Ibaraki, Japan

The power supplies for magnets of KEKB main ring were recycled into SuperKEKB main ring. Several tests were performed for all of the power supplies to check the soundness. Some of the power supplies were improved to satisfy the requirements of optical design, and some of them were replaced by new power supplies. Most of the trim-coils were arranged with one of power supply per a coil in SuperKEKB. The total number of the power supplies is over 2000.

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THPMW002

Power Supplies for Main Magnet of J-PARC Main Ring

3534

S. Nakamura, Y. Kurimoto, Y. Morita, T. Shimogawa
KEK, Ibaraki, Japan

A large magnetic field ripple of the order of 10^-2 were observed at the first beam commissioning of J-PARC main ring in 2008, To eliminate the ripple, we had improved the magnet power supplies by reconstructing a trap-filter of 600 Hz and adopting an additional DCCT. We made differencial circuit and symmetrical wiring for all magnets. On the other hand, acceleration period was reduced from 2.5 s to 1.4 s for increasing the beam power with feedforward control. We summarize the improvements of the magnet power supplies in this paper.

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THPMW003

Prototype Power Supply for SuperKEKB Final Focus Superconducting Corrector Magnets

3537

T. Oki, T. Adachi, S. Nakamurapresenter, N. Ohuchi, N. Tokuda
KEK, Ibaraki, Japan

A prototype power supply for the SuperKEKB final focus superconducting corrector magnets was developed. The aiming specifications of the power supply are a DC rated output of ± 60 A ± 5 V bipolar, current setting resolution < 1 ppm, current stability < 5 ppm/8 h, temperature coefficient < 1 ppm/degree, and current ripple < 5 ppm, where the assumed magnet inductance and cable resistance are 0.2'8.7 mH and 75 mohms, respectively. High power tests were performed and expected results were obtained.

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THPMW004

Conceptual Design for the HEPS Power Supply System

3540

F. Long, Y.P. Liu, X. Qi, Z.H. ZhenHua
IHEP, Beijing, People's Republic of China

The High Energy Photon Source (HEPS) requires more than 1600 power supplies with various kinds of power rating. The power supply system includes power supplies for the Booster, Transport, and Storage Ring. The power supply for the Booster is based on 2Hz sinusoidal dynamic current output with 1000ppm current tracking requirement. And the power supply performance requirements of 10ppm long-term current stability are much more rigorous than commercial power supplies. The paper shows the conceptual design of the power supply system for the HEPS and possible solutions to critical technical challenges.

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THPMW006

The Realization of the System for Rapid Detection of Bepc Ii Magnet Power Supply

3543

S.Y. Chen, M.C. Zhan, J.X. Zhangpresenter
IHEP, Bejing, People's Republic of China

To quickly find the causes of the accelerator unstable or lost beam caused by magnet power supply in the Beijing Electron Positron Collider running, this set of rapid detection system for magnet power supply is developed. The stability of the system in 8 hours is about 0.005%, it can acquire over nearly 500 sets of magnet power supply current value most quickly in the 0.33ms time. All data is written to the MySQL database in real time，So as to be able to quickly troubleshoot magnet power supply problem through historical data analysis of database comparison.

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THPMW007

The Design of a New State Space Digital Power Supply Prototype

3546

K. Shu, J.X. Zhangpresenter
IHEP, Beijing, People's Republic of China

Based on system identification and DLQR methods, a self-adaptive power supply can be implemented by the new controller structure without any change in power main circuit. Now only some raw tests have been taken which show its stableness, but the State Space Digital Controlling may turned out to be with potential. It makes power supplies with different capability easy to interchange without any more effort on tuning their parameters according to their loads, and can be extended to accommodate MIMO systems.

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THPMW008

Study of Digital Quench Detection System Based on System-on-Chip Technology

3549

SUPSS081

use link to see paper's listing under its alternate paper code

J.X. Zhang, X.J. Bian, F.S. Chen, J. Cheng, F. Long
IHEP, Beijing, People's Republic of China

Quench detection system is a key component of the quench protection system for superconducting magnets. According to operating experience of the quench protec-tion system for BEPCII interaction region superconduct-ing magnets and study in depth on the development process of System-on-Chip, we are establishing a set of digital quench detection system with high integration density and favourable portability by integrating IP cores, custom modules and developing embedded soft-ware on one piece of FPGA chip (Cyclone V SX SoC). The main components of this system are: 1.Hard proces-sor system based-on ARM Cortex-A9 architecture inte-grated with embedded operating system (Linux).2.Floating point DSP based-on soft IP core.3.Function Module Portion designed for different functions such as communicating with front end ADC, timing control, etc. This paper introduces the research progress of the system.
*D.F.Orris, S.Feher, M.J.Lamm, J.Nogiec, S.Sharonov, M.Tartaglia, J.Tompkins, et al.," A digital quench detection system for superconducting magnets", Proceedings of PAC'99, New York, 1999.

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THPMW009

Data Mining Applied in Management of Heavy Ion Accelerator Power Supplies

3552

SUPSS104

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H. Zhang, D.Q. Gao, Q.S. Qian, P. Sun
IMP/CAS, Lanzhou, People's Republic of China

Scientific and effective management of power supplies could reduce the failure rate and improve the efficiency of the heavy ion accelerator. This paper shows how to introduce data mining into the intelligent management of heavy ion accelerator power supplies. A web site platform was developed to collect raw data. The raw data includes many kinds of information about one power supply's life cycle form its development to operation. Among which the failure records are particularly important. According to the attribute that the records are mostly nominal data, R software and SQL Server 2008 Business Intelligence Development Studio were chose as mining tools. R soft-ware was used to carry on the statistical characteristic analysis and SQL Server 2008 Business Intelligence Development Studio was used to find out association rules. Useful conclusions have been drawn. This work has laid a solid foundation to further establish the intelligent management system of heavy ion accelerator power supplies.

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THPMW010

PAL-XFEL Dipole Magnet Power Supplies

3555

S.-H. Jeong, Y.-G. Jung, H.-S. Kang, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, D.H. Na, B.G. Oh, K.-H. Park, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea

Total 632 magnet power supplies (MPSs) are under operating in PAL-XFEL. These magnet power supplies can be categorized as three types - corrector, quadrupole and dipole. The dipole MPSs are ranging from 110A/80V bipolar PS to 310A/200V unipolar PS. The long term stability of bipolar power supply is 10 ppm with 250 A 40V output for gun solenoid. The three types of dipole MPSs are developed for PAL-XFEL. Precise measurement results show that all power supplies meet the required specifications. The long term operation stability of the MPSs are appeared to be sufficient for a stable operation of the PAL-XFEL.

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THPMW011

Magnet Power Supplies Performance at the PLS-II Storage Ring

3558

S.-C. Kim, A. Ahn, J.M. Kim, K.R. Kim, C.D. Park, J.C. Yoon
PAL, Pohang, Kyungbuk, Republic of Korea

Funding: This work is supported by the Ministry of science, ICT and Future Planning, Korea.
Magnet power supplies(MPS) are operating unipolar(bending, main-quadrupole, sextupole and septum) and bipolar(slow corrector, fast corrector, aux-quadrupole and skew) at the PLS-II storage ring(SR). Unipolar MPSs maintain stability, and bipolar MPSs maintain stability, have best resolution performance total operation region including zero-crossing during beam operation. Slow and fast corrector MPSs for beam correction have good step response characteristics. In this paper, we present the improve activity and performance of the PLS-II SR MPS.

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THPMW012

The Fast Interlock Controller for High Power Pulse Modulator at PAL-XFEL

3561

S.H. Kim, H.-S. Kang, K.H. Kim, S.J. Kwon, H.-S. Lee, S.S. Park, Y.J. Park
PAL, Pohang, Kyungbuk, Republic of Korea
I.S. Ko
POSTECH, Pohang, Kyungbuk, Republic of Korea

Funding: This work is supported by Ministry of Science, ICT(Information/Communication Technology) and Future Planning.
The modulator control system for PAL-XFEL consists of a PLC unit (Programmable Logic Controller) and FPSCM (Fast Pulse Signal Conditioning Module). There are two kinds of interlock, which are dynamic and static interlocks categorized as analogue monitor and control signals, digital monitor and control signals. In case of dynamic interlocks, the internal interface of the PLC unit had to be modified due to operating within 10 ms time response from the interlock event. The fast pulse signal conditioning module is adopted for preconditioning the fast pulse and DC signals that inherently have high noise levels generated from a beam voltage, a beam current and EOLC current. Those EM (Electro-Magnetic) noises are generated by thyratron switching. The amplitude of the thyratron noise is large which causes the problem at the control devices, frequently. In this paper, the test results of the interlock control system will be described.

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THPMW013

Development of PAL-XFEL Magnet Power Supply

3564

K.-H. Park, S.-H. Jeong, Y.-G. Jung, D.E. Kim, I.S. Ko, H.-G. Lee, S.B. Lee, B.G. Oh, H.S. Suh
PAL, Pohang, Kyungbuk, Republic of Korea
W.S. Choi
POSTECH, Pohang, Kyungbuk, Republic of Korea

All magnets and magnet power supplies (MPS) for PAL-XFEL had been installed at the site. The all MPSs had been tested with the magnets at the field. The total number of assembled MPSs was amounted to 688, which were grouped into nine categories by their power capacities in order to reduce the manufacturing cost and make maintenance easy. The general specifications for the MPS for the PAL- XFEL were summarized. The design configurations of the MPS were also explained to satisfy the given requirements such as the output current stability. The test results of performances of the MPSs for corrector magnets were described here.

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THPMW014

High Voltage Supply for Particle Accelerators Based on Modular Multilevel Converters

3567

P. Asimakopoulos, K.D. Papastergioupresenter
CERN, Geneva, Switzerland

Modular Multilevel Converters brought a paradigm shift in very high voltage and high power applications with the replacement of high voltage valves by multiple series-connected, low-voltage modules that can be by-passed in case of fault. The reliability and precision in output waveform generation make it a potential candidate in accelerator power conversion. This work demonstrates operation of MMC-based high voltage magnet supply for a transfer line application. The output current regulation precision and the total power losses are examined. Finally, the challenge of the control optimization combined with the passive components dimensioning is highlighted.
* R. Marquardt and A. Lesnicar, "An innovative modular multilevel converter topology suitable for a wide power range", in Proc. IEEE Bologna Power Technol. Conf., Jun. 2003, pp. 1-6.

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THPMW015

A Digtal Regulation Controller Prototype for the TPS Booster Power Supplies

3570

B.S. Wang, Y.-C. Chien, Y.T. Li, C.Y. Liu, K.-B. Liu, Y.S. Wongpresenter
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 present, analog current commands for all the booster power supplies with relative phase and amplitude information are generated externally. The current ramping profiles are pre-calculated and calibrated in a centralized manner. In this paper, an auto-calibration process using Curve-Fitting algorithm is proposed. In the new process, the current ramping profile data is first stored digitally in each power supply and then outputted to each power supply with a synchronous trigger signal in hope to eliminate the signal integrality problem inherent in analog signals , so that the beam energy boost up could be more reliable and efficient. The new proposed method has been implemented and tested successfully and will be applied to the booster power supplies to test its performance in the future.

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THPMW016

Dipole Power Supply for the Storage Ring of Taiwan Photon Source

3573

C.Y. Liu, Y.-C. Chien, K.-B. Liu, B.S. Wang, Y.S. Wongpresenter
NSRRC, Hsinchu, Taiwan

The performance of the TPS dipole power supply for the dipole magnets in the TPS storage ring is important. As the output current of the power supply follows the beam current for operation at 3 GeV, the power supply must deliver enormous energy to the dipole magnets. The target energy corresponds to 700 A at 800 V. The dipole supply for the TPS storage ring is a unipolar switching power supply, also called a bulk power supply. The TPS dipole power supply modulates the output current regulated by the PWM signal. The switching device is an IGBT module working at frequency 2 kHz. A PID controller and a DCCT are used for feedback control of the output current. We obtained an optimal control gain with long-term stability of the output current under 10 ppm. The performance of the TPS storage ring dipole supply can thus satisfy the TPS requirement. The beam current generates 3 GeV in the TPS ring. This paper reports the excellent results.

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THPMW017

Phase Shifter Power Supply Design

3576

Y.T. Li, K.-B. Liu, B.S. Wang, Y.S. Wongpresenter
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source is an interdisciplinary project. The phase-shift magnet is used to connect the radiation phase between two EPU48s. The power supply for this phase-shift magnet is a key element to determine the phase shift quality. In this report, the theory of the designed circuit is firstly introduced, and then a comparison simulation result and actual measurement is summarized to prove the correctness of theoretical analysis and circuit design.

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THPMW018

Simulation a High Step-up DC-DC Converter for Accelerator

3579

Y.S. Wong, Y.-C. Chien, C.Y. Liu, K.-B. Liu, B.S. Wang
NSRRC, Hsinchu, Taiwan

This paper simulation a novel high step-up DC-DC high circuit architecture for storage ring quadrupole and sextupole power supply DC bus voltage. The input source is a low voltage photovoltaic energy through proposed circuit to increase high output voltage system. This volt-age can be as DC bus of quadrupole and sextupole power supply. The part of the circuit has a power switch, isolated transformer inductors, switched capacitors and diodes. This proposed circuit has the advantages of galvanic isolation function, small transformer and high step-up gain and efficiency. Continuous conduction mode (CCM) operation principles are discussed in this paper. Finally, Simplis software has been used for simulation a 24 Vdc step-up to 200 Vdc and 100 w DC-DC converters.
high step-up, switched capacitor, photovoltaic

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THPMW019

Concept and Design of the Injection Kicker System for the FAIR SIS100 Synchrotron

3582

I.J. Petzenhauser, U. Blell, P.J. Spiller
GSI, Darmstadt, Germany
L.O. Baandrup, H. Bach, N. Hauge, K.F. Laurberg
Danfysik A/S, Taastrup, Denmark
G. Blokesch, M. Osemann
Ampegon PPT GmbH, Dortmund, Germany

The SIS100 synchrotron at GSI, Germany is designed for acceleration of protons and ions. For the injection into the synchrotron a kicker magnet system, which consists of 6 ferrite kicker magnet modules, installed in one vacuum tank with a required vacuum quality better than 10-9 Pa, will be needed. The magnetic field should be 118 mT in a 65 mm gap. These kicker magnet modules will be supplied with 6 separate pulser circuits. Each pulser has to produce a pulse current of up to 7 kA at a PFL (pulse forming line) voltage of 80kV at an impedance of 5.7 Ohm. The rise time has to be 130 ns and the variable pulse length is between 0.5 to 2.0 μs. The design concept for this kicker system from Ampegon PPT and DANFYSIK and the specific challenges will be described.

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THPMW020

Solid-state Compact Kicker Pulsar using Strip-line Type Blumlein with SIC-MOSFET in Spring-8

3585

C. Mitsuda, T. Honiden, K. Kobayashi, T. Kobayashi, S. Sasaki
JASRI/SPring-8, Hyogo-ken, Japan
N. Sekine
Sekine Electric Works Co. Ltd, Osaka, Japan

In the case of handling the electron beam by bunch-by-bunch and turn-by-turn with a kicker at the SPring-8, the performances required to a pulsar are short pulse width (<40ns) and high repetitions (>208kHz). In order to achieve these specifications, the short pulsed high voltage output and the utilization of the solid-state switch is necessary for an inductance load. In order to suppress the supplied voltage as low as as possible, it is an important feature to realize the extremely small-sized pulsar to be set near the kicker. On the basis of the experiences in developing the solid-state pulsar of 400ns/2kV using Si-MOSFET*, combination of the SiC-MOSFET and the strip-line type Blumlein pulse forming network (BPFN) was applied to the prototype driver to achieve a shorter pulse and higher power than Si-type driver. The completed pulsar accomplished a compact size (external dimensions; 300(H)x400(W)x400(D)mm). Furthermore, the targeted short-pulsed high voltage output of 123ns/12kV was obtained by 6 BPFNs serial connection to the load inductance of 800 nH. The BPFN detailed design to enable the compact size, high reliability and stability at high repetitions will be reported.
* C.Mitsuda et al., Proc. of IPAC2013, MOPAWA003

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THPMW021

Performance of a Compensation Kicker Magnet for J-PARC Main Ring

3588

T. Sugimoto, K. Ishii, H. Matsumoto, T. Shibata
KEK, Ibaraki, Japan
K. Fan
HUST, Wuhan, People's Republic of China

Four lumped-type kicker magnets have been equipped in the J-PARC MR (Main Ring) to inject 8 proton bunches. To increase beam power, the bunch length will be increased up to 350 ns that will restricts the rise time of the injection kicker to be less than 250 ns. We have already developed a method to improve the rising time to 200 ns*. However, two reflection pulses are appeared at the waveform tail, which will kick the circulating bunches and induce coherent oscillation leading to beam loss. To compensate reflection pulses, we decide to install two new lumped-type kicker magnets, which are excited independently making operation flexible. A ceramic vacuum duct with TiN coating is inserted in the compensation kickers. Magnetic field measurement and coupling impedance measurement have been carried. In this paper, the results of both these measurements and performance study using proton beam will be discussed.
* T.Sugimot et.al, "Upgrade of the Injection Kicker System for J-PARC Main Ring", MOPME069, IPAC14, Dresden, Germany, 2014.

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THPMW022

The RF Design of a Compact, High Power Pulse Compressor with a Flat Output Pulse

3591

SUPSS105

use link to see paper's listing under its alternate paper code

P. Wang, H.B. Chen, J. Shi
TUB, Beijing, People's Republic of China
I. Syratchev, W. Wuensch, H. Zha
CERN, Geneva, Switzerland

An X-band, high-power pulse compressor, which can produce a flat pulse and a power gain of 4.3, has been designed. The device is compact, with the dimensions of within 1m, and is designed for CLIC first energy stage based on klystrons. We also discuss about a two stage pulse compressor with power gain of 9.18, which may be a candidate of the X-FEL using CLIC X-band linacs and klystrons with low peak power.

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THPMW023

Simulation of an Accelerator Pulse Power Supply with an Active Rectifier Using SIMPLORER

3594

SUPSS106

use link to see paper's listing under its alternate paper code

F.J. Wu, D.Q. Gao, M. Li
IMP/CAS, Lanzhou, People's Republic of China

In this paper, a simulation model of an accelerator pulse power supply with an active rectifier (voltage-type SVPWM rectifier) was set up based on the C-Model function in SIMPLORER 8.1, which is a simulation software belonging to the ANSOFT corporation. We introduce a SVPWM rectifier into an accelerator pulse power supply to solve its problems such as low input power factor, a large number of AC current harmonics and instable DC bus voltage due to the diode or thyristor rectifier used in it now. Components of control strategies developed in C language were built up and inserted into the simulation project. The simulation results indicate that an accelerator pulse power supply with a SVPWM rectifier can solve the problems above well. For all the control strategies were developed in C language, they can be transplanted into the digital signal processor (DSP) nearly without change for the prototype controlling. So it provides a basis for development of the experimental prototype.

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THPMW024

Phase Tuning Results of the Waveguide Network System at Pal

3597

K.H. Kim, S.H. Kim, H.-S. Lee, S.S. Park, Y.J. Park
PAL, Pohang, Republic of Korea

We report the results of the phase tuning of the waveguide network system with the C-clamp tool and the resonance frequency tuning for the SLAC energy doubler. The high power waveguide network which dividing and feeding the power to the four accelerating structures. The phase length is adjusted within ± 0.25 degrees with a transmission phase measuring method. The resonant frequency range for the SLAC energy doubler is 2856 MHz ± 5 kHz, but a target range is 2856 MHz ± 1 kHz. We measured the phase length and an amplitude with a vector network analyser. The test setup consists of a SLED, a waveguide network, directional couplers, phase stable cables. All components of the waveguide networks were manufactured at VITZRO TECH and tested at the accelerator tunnel in the Pohang Accelerator Laboratory (PAL).

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THPMW027

Development of a Long Pulse High Power Klystron Modulator for the ESS Linac based on the Stacked Multi-level Topology

3600

C.A. Martins
ESS, Lund, Sweden
M. Collins, A. Reinap
Lund Technical University, Lund, Sweden

A novel Stacked Multi-Level modulator topology optimized for long pulse and high average power applications has been developed at ESS. It utilizes six identical modules connected in series at the HV output side and fed in parallel from the low voltage side. Each one is formed by one HF inverter, one step-up transformer, one HV rectifier bridge and one HV passive filter. They are supplied in groups of two from three capacitor banks which in turn will be charged from the low voltage electrical grid by using three groups of active AC/DC and DC/DC converters. Industrial standard power electronic components are used at the primary stage, which are placed in conventional electrical cabinets. Only few special components (transformers, rectifiers, filters) are required to be placed in an oil tank. A technology demonstrator rated for 115kV/20A and 3.5ms/14Hz is at the final phase of construction. The main power conversion circuit and regulation principles will be described and details on the design and construction of the main sub-systems will be given. Simulation and experimental results will be given showing the achieved performance in terms of HV pulse quality and AC grid power quality

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THPMW028

High Voltage Performance of Surface Coatings on Alumina Insulators

3603

A. Adraktas, M.J. Barnes, H.A. Day, L. Ducimetièrepresenter
CERN, Geneva, Switzerland

Alumina insulators and dielectrics are required for a variety of applications in particle accelerators. Their use in high voltage devices, both pulsed and DC, is well established as both insulation and mechanical support. In accelerator equipment the alumina is usually used in ultra-high vacuum and hence charge accumulation can be an issue, especially when the alumina is near to the beam. To address challenges regarding surface flashover and high secondary electron yield in high intensity accelerators, surface treatments and coatings are being considered. This paper presents predictions of the influence of surface coatings, on alumina insulators, upon electric field.

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THPMW029

Feasibility Study of the Fast SPS Ion Injection Kicker System

3607

A. Ferrero Colomo, P. Burkel, D. Comte, L. Ducimetièrepresenter, T. Kramer, V. Senaj, L. Sermeus, F.M. Velotti
CERN, Geneva, Switzerland

As part of the upgrade project for ions the rise time of the injection kicker system into the SPS needs to be improved. The changes being studied include the addition of a fast Pulse Forming Line parallel to the existing Pulse Forming Network for the fast kicker magnets MKP-S. With the PFL an improved magnetic field rise time of 100 ns is targeted. Two different configuration utilizing a 2nd thyratron or two fast diode stacks have been outlined in the past. This paper presents the recent progress on the analogue circuit simulations for both options as well as measurements carried out on a test system. Modelling, optimization and simulation of the entire system with diodes and a second configuration with two thyratron switches are outlined. Measurement results are given and the feasibility of the upgrade is discussed.

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THPMW030

Studies of Impedance-related Improvements of the SPS Injection Kicker System

3611

M.J. Barnes, A. Adraktas, M.S. Beck, G. Bregliozzi, H.A. Day, L. Ducimetièrepresenter, J.A. Ferreira Somoza, B. Goddard, T. Kramer, C. Pasquino, G. Rumolo, B. Salvant, L. Sermeus, J.A. Uythoven, L. Vega Cid, W.J.M. Weterings, C. Zannini
CERN, Geneva, Switzerland
F.M. Velotti
EPFL, Lausanne, Switzerland

The injection kicker system for the SPS consists of sixteen magnets housed in a total of four vacuum tanks. The kicker magnets in one tank have recently limited operation of the SPS with high-intensity beam: this is due to both beam induced heating in the ferrite yoke of the kicker magnets and abnormally high pressure in the vacuum tank. Furthermore, operation with the higher intensity beams needed in the future for HL-LHC is expected to exacerbate these problems. Hence studies of the longitudinal beam coupling impedance of the kicker magnets have been carried out to investigate effective methods to shield the ferrite yoke from the circulating beam. The shielding must not compromise the field quality or high voltage behaviour of the kicker magnets and should not significantly reduce the beam aperture: results of these studies, together with measurements, are presented. In addition results of tests to identify the causes of abnormal outgassing are presented.

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THPMW031

Current and Future Beam Thermal Behaviour of the LHC Injection Kicker Magnet

3615

H.A. Day, M.J. Barnes, L. Ducimetièrepresenter, L. Vega Cid, W.J.M. Weterings
CERN, Geneva, Switzerland

During Run 1 of the LHC the injection kicker magnets caused occasional operational delays due to beam induced heating with high bunch intensity and short bunch lengths. Significant upgrades were carried out to the injection kicker magnets during long shutdown 1, including a new design of beam screen to reduce the beam induced heating. Nevertheless these kicker magnets may limit the performance of HL-LHC unless additional, mitigating, measures are taken. Hence extensive simulations have been carried out to predict the distribution of the beam induced power deposition within the magnet and detailed thermal analyses carried out to predict the temperature profiles. To benchmark the simulations the predicted temperatures are compared with observables in the LHC. This paper reports on observations of the thermal behaviour of the magnet during run 2 of the LHC, with 25ns beam. In addition the measurement data is used to extrapolate temperature rise for the beam parameters expected for high-luminosity LHC.

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THPMW032

Measurements on Magnetic Cores for Inductive Adders with Ultra-Flat Output Pulses for CLIC DR Kickers

3619

J. Holma, M.J. Barnes, L. Ducimetièrepresenter
CERN, Geneva, Switzerland

The CLIC study is investigating the technical feasibility of an electron-positron collider with high luminosity and a nominal centre-of-mass energy of 3 TeV. The CLIC pre-damping rings and damping rings (DRs) will produce ultra-low emittance beam with high bunch charge. To avoid beam emittance increase, the DR kicker systems must provide extremely flat, high-voltage, pulses. The specifications for the DR extraction kickers call for 160 ns duration flattop pulses of ±12.5 kV, with a combined ripple and droop of not more than ±0.02 % (±2.5 V). An inductive adder is a very promising approach to meet the specifications. Two five layer, 3.5 kV, prototype inductive adders have been built at CERN, and used to test passive and active analogue modulation methods to compensate droop and ripple of the output pulses. Recently, magnetic core materials and full-scale magnetic cores have been evaluated for the 12.5 kV prototype inductive adders. These results are presented in this paper and conclusions are drawn concerning the design of the full-scale prototypes.

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THPMW033

Operational Experience of the Upgraded LHC Injection Kicker Magnets

3623

M.J. Barnes, A. Adraktas, G. Bregliozzi, S. Calatroni, H.A. Day, L. Ducimetièrepresenter, B. Goddard, V. Gomes Namora, V. Mertens, B. Salvant, J.A. Uythoven, L. Vega Cid, W.J.M. Weterings, C. Yin Vallgren
CERN, Geneva, Switzerland

During Run 1 of the LHC the injection kicker magnets caused occasional operational delays due to beam induced heating with high bunch intensity and short bunch lengths. In addition, sometimes there were also sporadic issues with microscopic unidentified falling objects, vacuum activity and electrical flashover of the injection kickers. An extensive program of studies was launched and significant upgrades were carried out during long shutdown 1. These upgrades include a new design of a beam screen to both reduce the beam coupling impedance of the kicker magnet, and to significantly reduce the electric field associated with the screen conductors, hence decreasing the probability of electrical breakdown in this region. In addition new cleaning procedures were implemented and equipment adjacent to the injection kickers and various vacuum components were modified. This paper presents operational experience of the injection kicker magnets during Run 2 of the LHC and assesses the effectiveness of the various upgrades.

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THPMW034

Review on the Effects of Characteristic Impedance Mismatching in a Stripline Kicker

3627

C. Belver-Aguilar, M.J. Barnes, L. Ducimetièrepresenter
CERN, Geneva, Switzerland

A stripline kicker operates as two coupled transmission lines, with two TEM operating modes, known as odd and even modes. The characteristic impedance of these two modes is generally different, both only tend to the same value either when the electrodes are widely separated or when the electrodes are very close to the beam pipe wall. In all other cases, the even mode characteristic impedance is always higher than the odd mode characteristic impedance. The specifications required for a kicker operating in a low emittance ring are usually very challenging. In this situation it is desirable to match the even mode characteristic impedance of the striplines to the resistance of their termination. However a mismatched odd mode impedance can significantly influence the striplines performance. This paper presents predictions for the influence of the odd mode characteristic impedance upon the contribution of each field component, electric and magnetic, to the deflection angle. In addition, the variation of the characteristic impedance and field homogeneity with frequency are presented.

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THPMW035

Considerations on an Upgrade Possibility of the LHC Beam Dump Kicker System

3631

M.A. Fraser, W. Bartmann, C. Bracco, L. Ducimetièrepresenter, B. Goddard, T. Kramer, V. Senaj
CERN, Geneva, Switzerland

The LHC Beam Dump System (LBDS) is designed to safely dispose the circulating beams over a wide range of energy from 450 GeV up to 7 TeV, where the maximum stored energy is 362 MJ per beam. One of the most critical components of the LBDS are the extraction kickers that must reliably switch on within the 3 us particle-free abort gap. To ensure this functionality, even in the event of a power-cut, the power generator capacitors remain charged and hence the Gate Turn-Off (GTO) switch stack has to hold the full voltage throughout beam operation. The increase of the LHC collision energy to 13 TeV has increased the voltage levels at the GTO stacks and during re-commissioning an increased rate of high-voltage (HV) related issues at the level of the GTO stack was observed. Different solutions have been analysed and an improved GTO stack will be implemented. This paper also outlines the benefit of adding more kicker magnets to improve the voltage hold off issues and to improve the tolerance to missing kickers during extraction.

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THPMW037

Pulsed Power Systems for ESS Klystrons

3634

I. Roth, M.P.J. Gaudreau, M.K. Kempkespresenter
Diversified Technologies, Inc., Bedford, Massachusetts, USA
J. Domenge
Sigma Phi Electronics, Wissembourg, France
J.L. Lancelot
Sigmaphi, Vannes, France

Diversified Technologies, Inc. (DTI) is building three long pulse solid-state klystron transmitters to meet spallation source requirements. Two of the three will be installed at CEA Saclay and the National Institute of Nuclear and Particle Physics (IN2P3) in 2015, to be used as test stands for the European Spallation Source (ESS), The third system will be installed at Oak Ridge National Laboratory (ORNL) for the Spallation Neutron Source (SNS).

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THPMW038

Prototyping of the ALS-U Fast Kickers

3637

G.C. Pappas, S. De Santis, J.-Y. Jung, T.H. Luo, C. Steier, C.A. Swensonpresenter, W.L. Waldron
LBNL, Berkeley, California, USA

Prototyping of major components for the ALS-U kickers is in progress. A tapered stripline kicker has been built for installation and testing in the ALS, and multiple modulator options to meet the fast rise time required for swap out injection have been considered. High voltage feedthroughs that are matched into the multi GHz range are also being studied.
* Pappas et al., "Fast Kicker Systems for ALS-U", Proc. of IPAC'14, Dresden, Germany, MOPME083.

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THPMW040

Multipactor Discharge in a Resonator as an Active Switch for RF Pulse Compression

3640

J.Q. Qiu, S.P. Antipovpresenter, C.-J. Jing, A. Kanareykin
Euclid Beamlabs LLC, Bolingbrook, USA
E.V. Ilyakov, I.S. Kulagin, S.V. Kuzikov, A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia

Funding: Phase I DOE SBIR
Pulse compression is a method of increasing the peak power of the microwave pulse at the expense of its length. Over the years a number of pulse compressors had been demonstrated with some being bulky but efficient, like the binary pulse compressor and other being compact but less efficient, like SLED-II. An active pulse compressor had been proposed to increase the efficiency and compression ratio which relies on a high power active switch. Currently there are no practical switches that can work reliably with 100 s of megawatts of power. Most of the switches (ferroelectric, plasma-based, semiconductor) are limited by the breakdown strength of various dielectric inserts. In this paper we report on an active switch development which is based on a pure copper resonator and controlled by a single-side multipactor discharge at a metallic wall in the presence of a resonant DC magnetic field and a normal to metal rf field. The discharge is ignited by external rf power produced by inexpensive 2.45 GHz, 1-5 kW magnetrons.

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THPMW041

Single Crystal Diamond X-ray Lens Development

3643

S.P. Antipov, S.V. Baryshev, S. Baturin, R.A. Kostin
Euclid TechLabs, LLC, Solon, Ohio, USA
T.C. Irving, A. Olga
CSSRI, Chicago, USA
S. Stoupin
ANL, Argonne, Ilinois, USA

Funding: Phase I DOE SBIR
The next generation light sources such as diffraction-limited storage rings and high repetition rate free electron lasers (FELs) will generate x-ray beams with significantly increased peak and average brilliance. These future facilities will require x-ray optical components capable of handling large instantaneous and average power densities while tailoring the properties of the x-ray beams for a variety of scientific experiments. In this paper we report on research and development of a single crystal diamond compound refractive lens. Diamond is the best material for high heat load applications. Moreover single crystal lens preserves coherence of the x-ray beam because scattering from grain boundaries, voids and impurities, typical for current beryllium lenses is minimized. A set of two-dimensional single crystal diamond lenses had been fabricated by fs-laser cutting and tested at Advanced Photon Source (Argonne).

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THPMW042

Overview of Driver Technologies for Nanosecond TEM Kickers

3645

A.K. Krasnykh
SLAC, Menlo Park, California, USA

Funding: Work supported in part by US Department of Energy under contract DE-AC02-76SF00515 and in part by US Department of Energy under contract DE-AC02-06CH11357
Overview of modern methods, circuits, and practical realizations for multi MW peak power pulsers will be presented. All used pulser components are manufactured by the US national industry and they are available for design and pulser fabrication. Two concepts will be discussed: (1) an approach is based on assistance of a nonlinear transmission line with ferromagnetic media and (2) an approach is based on assistance of special diodes which are working in a specific mode of operation. In both approaches the nonlinear characteristic of switching media (ferromagnetic and solid state plasma) are employed in final stage of the pulser to form the multi MW level nanosecond pulses.

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reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW042

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THPMW043

Observation of Beam-induced Abort Kicker Ferrite Heating in RHIC

3648

C. Montag, L. Ahrens, K.A. Drees, H. Hahn, J.-L. Mi, C. Pai, J. Sandberg, T.C. Shrey, P. Thieberger, J.E. Tuozzolo, W. Zhang
BNL, Upton, Long Island, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
During the FY 2013 RHIC polarized proton run, deterioration of the abort kicker system was observed. The reduced kicks resulted in quenching the superconducting quadrupole Q4 downstream of the beam dump. Frequent re-tuning of the modulator wave form temporarily mitigated the effect, which worsened during the course of the run. Beam-induced heating of the kicker ferrites was evenutally identified as the root cause of this behavior. We report our observations and discuss modifications to the kickers.

DOI •

reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMW043

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