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The KEK injector linac delivers electron and positron beams with energies from 2.5 GeV to 7 GeV by pulse-to-pulse modulation (ppm) at 50 Hz into the dual ring SuperKEKB collider and two light source storage rings. As the beam quality requirement from SuperKEKB is demanding, the beam orbit and optics conditions have to be maintained precisely. To that end 100 newly designed pulsed magnets were installed. Quadrupole magnets with the inductance of 1 mH are driven by power supplies with pulses up to 330 A, 220 V and 1 ms, which recover the energy stored in coils up to 75%. Orbit corrector magnets with the inductance of 3 mH are driven with bipolar pulsed power supplies up to 10 A. Those power supplies are controlled under the event-based synchronized controls and monitored pulse-by-pulse, and are confirmed to have the stability of 0.01% in a day and within 0.05% over a month.
The pulsed magnet ppm operation is indispensable for the experimental performance in particle physics and photon science with the simultaneous top-up injections.
Please send your comments and questions to K.Furukawa or Y.Enomoto.
Pulsed Magnet Control System Using COTS PXIe Devices and LabVIEW [pdf],
Y. Enomoto, K. Furukawa, T. Natsui, M. Satoh, H. Saotome, Proc. of ICALEPCS2019, New York, USA, October 2019, pp.946-949, WECPR05.
Timing System for Multiple Accelerator Rings at KEK e+/e- Injector LINAC [pdf]
F. Miyahara, K. Furukawa, H. Kaji, M. Satoh, H. Sugimura, H. Saotome, T. Kudo, S. Kusano, Proc. of PCaPAC2018, Hsinchu, Taiwan, October 2018, pp.207-209, THP19.
Pulse-to-pulse Beam Modulation for 4 Storage Rings with 64 Pulsed Magnets [pdf],
Y. Enomoto, K. Furukawa, T. Kamitani, F. Miyahara, T. Natsui, M. Satoh, K. Yokoyama, M. Yoshida, S. Ushimoto, H. Saotome, Proc. of LINAC2018, Beijing, China, September 2018, pp.609-614, WE1A06.
Pulsed Magnet [slide-pdf]
Y. Enomoto, The 22nd KEKB Accelerator Review, Mar.2018.
A New Pulse Magnet Control System in the KEK Electron Positron LINAC [pdf],
Y. Enomoto, K. Furukawa, T. Natsui, M. Satoh, H. Saotome, Proc. of IPAC2018, Vancouver, Canada, April 2018, pp.2121-2123, WEPAK014.
Upgrade of KEK Electron/positron Linac Control System for the both SuperKEKB and Light Sources [pdf],
K. Furukawa, Y. Enomoto, H. Kaji, H. Katagiri, M. Kurashina, K. Mikawa, T. Miura, F. Miyahara, T. Natsui, I. Satake, M. Satoh, Y. Seimiya, H. Sugimura, T. Suwada, Proc. of ICALEPCS2017, Barcelona, Spain, October 2017, pp.1257-1260, THMPL02.
The Pulsed Magnet System for the Simultaneous Injection
of KEK-PF and KEKB Ring
T. Mimashi, K. Furukawa, N. Iida, K. Kakihara, M. Kikuchi, T. Miyajima, S. Nagahashi, M. Satoh, M. Tawada, A. Ueda, T. Kudo, K. Iwamoto, S. Kodama, A. Sasagawa, N. Ishii, H. Mori, Proc of PAC2009, Vancouver, Canada, May.2009, pp.172-174, MO6PFP018.
Design and Performance of Optics for Multi-energy Injector Linac [pdf]
Y. Ohnishi, T. Kamitani, N. Iida, M. Kikuchi, K. Furukawa, M. Satoh, K. Yokoyama, Y. Ogawa, Proc of LINAC2008, Vancouver, Canada, Sep.2008, pp.413-415, TUP012.
Bipolar power supplies for pulsed steering magnets
Y. Enomoto, Proc of PASJ2021, Takasaki, Japan, Aug.2021, pp.252-255, MOP012.
Development of motorized movable structures for accelerator girders and magnet supports
S. Ushimoto, Proc of PASJ2021, Takasaki, Japan, Aug.2021, pp.422-426, TUP007.
Y. Enomoto, SuperKEKBの長期運転プランに関する検討会 (6), Mar.2021.
Y. Enomoto, OHO 2019 - SuperKEKB, Tsukuba, Japan, Sep.2019, part 4, pp.1-21.
Motor control of magnet support 1
Y. Enomoto, S. Sasaki, S. Ushimoto, Proc of PASJ2019, Kyoto, Japan, Aug.2019, pp.657-660, THPH025.
Motor control of magnet support 2
S. Ushimoto, Y. Enomoto, S. Sasaki, Proc of PASJ2019, Kyoto, Japan, Aug.2019, pp.958-961, FRPH030.
Development of interlock system for pulse magnet using cRIO
S. Ushimoto, Y. Enomoto, Proc of PASJ2019, Nagaoka, Japan, Aug.2018, pp.1102-1104, THP097.
K. Furukawa, KEK 環境報告 2018 (KEK Environmental Report 2018), Sep.2018, pp.41-43.
Timing system for the KEK e+/e- Injector Linac [pdf]
F. Miyahara, H. Kaji, H. Sugimura, H. Katagiri, M. Satoh, T. Suwada, X. Zhou, R. Zhang, K. Furukawa, T. Matsumoto, T. Miura, M. Yoshida, S. Kusano, T. Kudou, H. Kumano, T. Oofusa, H. Saotome, Proc of PASJ2018, Nagaoka, Japan, Aug.2018, pp.544-548, WEP082.
Y. Enomoto, 第3回SuperKEKB国内レビュー, Sep.2017.
Injection operation into multiple storage rings at KEK electron/positron 7-GeV injector linac (II)
K. Furukawa, M. Akemoto, D. Arakawa, Y. Arakida, M. Ikeda, H. Ego, A. Enomoto, Y. Enomoto, S. Ohsawa, Y. Ogawa, K. Kakihara, H. Katagiri, T. Kamitani, M. Kawamura, M. Kurashina, I. Satake, D. Satoh, M. Satoh, T. Shidara, X. Zhou, A. Shirakawa, H. Sugimura, T. Suwada, Y. Seimiya, T. Takenaka, M. Tanaka, R. Zhang, F. Qiu, N. Toge, K. Nakao, H. Nakajima, T. Natsui, M. Nishida, T. Higo, S. Fukuda, Y. Funahashi, H. Honma, H. Matsushita, S. Matsumoto, T. Matsumoto, T. Miura, K. Mikawa, S. Michizono, F. Miyahara, Y. Yano, K. Yokoyama, M. Yoshida, Proc of PASJ2017, Sapporo, Japan, Aug.2017, pp.300-303, TUP006.
Motor-driven Control of Support Structure for Pulse Magnets
S. Ushimoto, Y. Enomoto, T. Higo, Proc of PASJ2016, Chiba, Japan, Aug.2016, pp.1019-1022, TUP060.
Field test of the new driver software for injector pulsed magnets [pdf]
K. Furukawa, Apr.8.2020.
M. Satoh, Apr.13.2020.
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