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| THP072 |
Tune Tracking RFKO Bunch Purification with Bunch-by-bunch Feedback at SPring-8
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803 |
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- T. Nakamura, T. Aoki, K. Fukami, K. Kobayashi, M. Shoji, H. Yonehara
JASRI/SPring-8, Hyogo-ken
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The drift of a betatron tune from a RFKO driving tune reduces the betatron amplitude excited by RFKO. For the booster synchrotron in SPring-8, such tune drift occurs at on-demand operation for the top-up mode injection. To overcome this drift, we are developing a tune tracking RFKO system for bunch purification at the booster. In this system, The betatron motion of the main bunch was excited by positive feedback with which the excited amplitude is much less sensitive to the tune shift. The system is based on SPring-8 FPGA based bunch-by-bunch feedback processor and the kick signal produced by the feedback processor was send to the feedback kicker and the RFKO system for the purification. We describe the system and report some beam test result.
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| WEP091 |
Upgrade of the Accelerator Radiation Safety System for SPring-8
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579 |
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- C. Saji, H. Hanaki, M. Kago, T. Masuda, T. Matsushita, H. Ohkuma, K. Soutome, S. Suzuki, M. Takao, R. Tanaka, M. Toko, H. Yonehara
JASRI/SPring-8, Hyogo-ken
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The accelerator safety interlock system to protect persons from radiation hazard induced by electron beams and synchrotron radiation has been operating over a decade in SPring-8. This system is monitoring the safety condition of accelerator components and stops injection electron beams in case of the failure, and stored electron beams are aborted if necessary. SPring-8 complex is composed of five accelerator/beam-transport areas. The injection beam direction can be frequently changed between the two accelerator areas; SPring-8 storage ring and NewSUBARU storage ring. Therefore, the safety interlock system was built introducing the idea of the "operation mode" control system. Once one of the operation modes is selected, the electron beams transport route is defined uniquely. The operation mode control system manages the combination of some accelerator/beam-transport areas. Since the operation mode control system became complicated because the number of "operation mode" has increased according to SPring-8 upgrades, we are planning to construct new safety interlock system. We will report the status of the current safety interlock system and the conceptual design of the new one.
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Poster
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