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Nagayama, Shota; Harada, Hiroyuki; Shimogawa, Tetsushi*; Sato, Atsushi*; Yamada, Ippei; Chimura, Motoki; Kojima, Kunihiro; Yamamoto, Kazami; Kinsho, Michikazu
Proceedings of 20th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.526 - 530, 2023/11
We have been developing "Non-destructive electrostatic septum" for a slow extraction. This septum has multiple electrodes placed around the region without the beam hitting and separate the beam by its electric field. To evaluate its electric field, we have built a prototype septum and a test machine, which consists of an electron gun and monitors. This test machine can measure the electric field indirectly by using a narrow electron beam. The experiment results of prototype septum is good agreement with the calculation one. However, this electric field distribution is not enough to separate the beam. A step function-like electric field distribution is ideal for the beam separation with minimal negative effect on the beam. We have studied to improve the electrode configuration to match the beam shape. In this paper, we present the result of the electric field measurements and the septum improvement. Additionally, we describe the future plan of this development.
Moriya, Katsuhiro; Kojima, Kunihiro*
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no abstracts in English
Kojima, Kunihiro*; Okamoto, Hiromi*; Moriya, Katsuhiro
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no abstracts in English
Kojima, Kunihiro*; Okamoto, Hiromi*; Moriya, Katsuhiro
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no abstracts in English
Chimura, Motoki; Yamada, Ippei; Kojima, Kunihiro
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no abstracts in English
Kojima, Kunihiro; Harada, Hiroyuki; Saha, P. K.
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We have studied the compensation of random resonance for further beam power ramp-up and beam loss mitigation in the 3 GeV rapid cycling synchrotron (RCS). The particle loss will produce high levels of radioactivity in high-intensity synchrotrons such as the RCS and can limit the available beam power. While the current beam loss has been successfully mitigated to 0.1 % at the designed beam power of 1 MW, further beam loss mitigation and expansion of the stability region are required to realize the beam power of 1.5 MW. For this purpose, we have conducted a tune survey with a low current beam to identify the beam loss source. We reveal the enhancement of the 2nd-order random resonance (
) and demonstrate the compensation of the resonance by using the trim quadrupole magnets (QDT). In addition, the resonance compensation using the QDT is confirmed to be effective in reducing beam loss for the high current beam provided to the material and life science facility. In this meeting, the results of the study of random resonance compensation will be presented.
