Author: Matsumoto, H.
Paper Title Page
TUPMR040 The Development of a New Low Field Septum Magnet System for Fast Extraction in Main Ring of J-PARC 1340
  • T. Shibata, K. Ishii, H. Matsumoto, N. Matsumoto, T. Sugimoto
    KEK, Ibaraki, Japan
  • K. Fan
    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 ※ DOI:10.18429/JACoW-IPAC2016-TUPMR040  
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THOBB01 PAL-XFEL Linac RF System 3192
  • H.-S. Lee, H. Heo, J. Hu, H.-S. Kang, K.W. Kim, K.H. Kim, S.H. Kim, I.S. Ko, S.S. Park, Y.J. Park
    PAL, Pohang, Kyungbuk, Republic of Korea
  • H. Matsumoto
    KEK, Tokai, Ibaraki, Japan
  The PAL-XFEL hard X-ray linac has a 716 m long gallery and tunnel for 10 GeV. Forty nine modulators are necessary in the hard X-ray gallery for an X-band linearizer, an S-band RF gun, two S-band deflectors and 45 S-band klystrons for accelerating structures. They have been installed completely from March 15, 2015 to December 30, 2015 after completing the building construction. There are 51 modulators, 178 accelerators structures, 42 SLEDs in the hard X-ray linac and the soft X-ray linac. The RF conditioning of the klystrons, SLEDs and accelerating structures were stated from November 24, 2015. We describe the PAL-XFEL system and the current status of the linac RF system.  
slides icon Slides THOBB01 [22.023 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THOBB01  
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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, "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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Pulsed Modulator Technology  
  • H. Matsumoto, M. Akemoto
    KEK, Ibaraki, Japan
  This talk provides a review of high voltage pulse modulators used for RF sources. Thanks to the innovation of high power semiconductor devices, various types of solid state switch devices and solid state modulators have been developed and realized. They improve the stability and reliability of the accelerator operation, and contribute downsizing and cost down for incoming new accelerators. This presentation addresses all relevant issues.  
slides icon Slides FRXAB01 [6.767 MB]  
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THPMY029 Technical Overview of the PAL-XFEL Low-Conductivity Water Cooling System 3718
  • B.H. Lee, H.-G. Kim, K.W. Kim, K.R. Kim, S.H. Kim, Y. C. Kim, H.M. Lee, M.S. Lee, H. Matsumoto, I. Mok, C.W. Sung, J. Yang
    PAL, Pohang, Republic of Korea
  • J.H. Jeon
    Taeyoung, Seoul, Republic of Korea
  • K.T. Kim
    HMT, Pohang, Republic of Korea
  • I.S. Ko
    POSTECH, Pohang, Kyungbuk, Republic of Korea
  Pohang Accelerator Laboratory (PAL) started operation of an X-ray Free Electron Laser (XFEL) based on 10GeV linear accelerator in FY2015. For accurate temperature control of the various XFEL accelerator devices, a low-conductivity water (LCW) cooling system were installed. The LCW pump station generates LCW controlling the temperature variation within ±0.1°C. The LCW is supplied to klystrons including modulators and various control devices. On the other hand, the precision temperature controlled water to minimize temperature variation down to ±0.02°C. This water is supplied to accelerating columns, wave guide and SLED. Therefore, this paper shows the design, construction and operation of the LCW cooling system.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMY029  
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