Low-level RF Control and Monitor at KEK Injector Linac

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Overview


Overview of LLRF system

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 acceleration conditions have to be maintained precisely. To that end low-level RF infrastructure was installed. The system is controlled under the event-based synchronized controls and monitored pulse-by-pulse, and are confirmed to have the stability of 0.1% and 0.1 degree in a day.

The LLRF 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, T.Matsumoto or T.Miura.


Presentations and Articles

Injector RF and LLRF [slide-pdf]
T. Miura, The 23rd KEKB Accelerator Review, July 2019.

Development Status of RF Reference Phase Stabilization System for SuperKEKB Injector LINAC [pdf],   [doi]  
N. Liu, B. Du, D. Arakawa, H. Katagiri, T. Kobayashi, S. Michizono, Y. Yano , T. Matsumoto, T. Miura, F. Qiu, Proc. of IPAC2019, Melbourne, Australia, May 2019, pp.3879-3881, THPRB033.

Performance Evaluation of the RF Reference Phase Stabilization System on Fiber-Optical Link for KEK e-/e+ Injector LINAC [jacow]   [doi]
N. Liu, B.T. Du, D. Arakawa, H. Katagiri, S. Michizono, Y. Yano, T. Matsumoto, T. Miura, F. Qiu, Proc. of LINAC2018, Beijing, China, September 2018, pp.230-232, MOPO107.

RF Monitor System for SuperKEKB Injector Linac [pdf],   [doi]
H. Katagiri, M. Akemoto, D. Arakawa, T. Matsumoto, T. Miura, F. Qiu, Y. Yano, Proc. of IPAC2018, Vancouver, Canada, Apr - May 2018, pp.2128-2130, WEPAK016.

Low-level RF System for the SuperKEKB Injector LINAC [pdf],   [doi]
T. Matsumoto, M. Akemoto, D. Arakawa, H. Katagiri, T. Miura, F. Qiu, Y. Yano, Proc. of IPAC2018, Vancouver, Canada, Apr - May 2018, pp.2131-2133, WEPAK017.

LLRF Control Unit for SuperKEKB Injector Linac [pdf],   [doi],   [poster]
T. Miura, M. Akemoto, D. Arakawa, H. Katagiri, T. Matsumoto, F. Qiu, Y. Yano, N. Liu, Proc. of IPAC2018, Vancouver, Canada, Apr - May 2018, pp.2134-2136, WEPAK018.

Measurement of the RF Reference Phase Stability in the SuperKEKB Injector LINAC [pdf],   [doi]
N. Liu, T. Miura, T. Matsumoto, F. Qiu, S. Michizono, D. Arakawa, H. Katagiri, Y. Yano, Proc. of IPAC2018, Vancouver, Canada, Apr - May 2018, pp.4815-4818, THPML073, SUSPL063.

LLRF development [slide-pdf]
T. Miura, The 19th KEKB Accelerator Review, March 2014.

KEK LLRF Systems [slide-pdf]
T. Miura, LLRF2013, Lake Tahoe, USA, October 2013, Id:23.


Japanese Articles

Reference RF phase control system for SuperKEKB injector linac [pdf]   [poster]
T. Miura, T. Matsumoto, T. Kobayashi, D. Arakawa, H. Katagiri, F. Qiu, Y. Yano, H. Kaji, M. Satoh, F. Miyahara, H. Sugimura, Proc of PASJ2020, Matsuyama, Japan, Sep.2020, pp.569-572, THPP40.

Development of RF monitor for SuperKEKB injector linac [pdf]   [slide-pdf]
H. Katagiri, KEK Technology Prize 2019, Feb.2020.

Measurement of beam-induced field for SuperKEKB injector linac [pdf]
H. Katagiri, D. Arakawa, F. Qiu, S. Matsumoto, T. Matsumoto, T. Miura, Y. Yano, Proc of PASJ2019, Kyoto, Japan, Aug.2019, pp.892-894, FRPH012.

Noise countermeasure of SuperKEKB injector linac [pdf]   [poster]
Y. Yano, M. Akemoto, D. Arakawa, H. Katagiri, M. Kawamura, F. Qiu, K. Nakao, H. Nakajima, H. Honma, H. Matsushita, S. Matsumoto, T. Matsumoto, T. Miura, Proc of PASJ2018, Nagaoka, Japan, Aug.2018, pp.777-780, THP008.

Phase Difference Monitor between SuperKEKB Injector LINAC and Rings using Direct Sampling Technique [pdf]
N. Liu, T. Miura, T. Matsumoto, D. Arakawa, H. Katagiri, F. Qiu, S. Michizono, B. Du, Proc of PASJ2018, Nagaoka, Japan, Aug.2018, pp.1123-1126, THP103.

RF source diagnosis using RF monitor system in SuperKEKB injector linac [pdf]   [poster]
H. Katagiri, M. Akemoto, D. Arakawa, F. Qiu, T. Matsumoto, T. Miura, Y. Yano, Proc of PASJ2018, Nagaoka, Japan, Aug.2018, pp.1127-1130, THP104.

Phase shifter for RF reference signal in SuperKEKB Injector LINAC [pdf]
T. Miura, D. Arakawa, M. Akemoto, H. Katagiri, F. Qiu, T. Matsumoto, Y. Yano, N. Liu, Proc of PASJ2018, Nagaoka, Japan, Aug.2018, pp.1136-1139, THP106.

The consideration of RF phase reference distribution system for the injector linac of SuperKEKB [pdf]
N. Liu, T. Miura, T. Matsumoto, D. Arakawa, H. Katagiri, Y. Yano, F. Qiu, S. Michizono, S.B. Wibowo, Proc of PASJ2017, Sapporo, Japan, Aug.2019, pp.1015-1018, WEP065.


Links

Event-based Pulse-to-pulse Beam Modulation Controls for Simultaneous Injections

Embedded EPICS IOC on LLRF Controllers

Conference Papers from KEK Linac, LCG and KCG


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Kazuro Furukawa <kazuro.furukawa AT kek.jp>, May.10.2020 - Apr.10.2021.
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