Achievement of very low jitter extraction of high power proton beams in the J-PARC RCS
Achievement of very low jitter extraction of high power proton beams in the J-PARC RCS
复制标题
在 J-PARC RCS 中实现高功率质子束的极低抖动提取
DOI：
10.1016/j.nima.2011.05.040
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发表时间：
2011
影响因子：
1.4
通讯作者：
K. Hasegawa
中科院分区：
文献类型：
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作者：
F. Tamura;M. Yoshii;A. Schnase;C. Ohmori;M. Yamamoto;M. Nomura;M. Toda;T. Shimada;K. Hara;K. Hasegawa
日本质子加速器研究综合体（J-PARC）的3gev快速循环同步加速器（RCS）向材料和生命科学设施（MLF）和主环（MR）提供高强度质子束。RCS的重复频率为25hz。J-PARC的典型工作周期为3.2 s，由80个RCS周期组成。四束脉冲用于磁磁共振，其他脉冲被引入MLF。由于核磁共振采用桶对桶注入方案，来自RCS的光束必须以精确的相位注入到核磁共振的适当的射频桶中。在MLF的情况下，光束必须与费米斩波器同步，其容差只有几个100ns。因此，两个目的地都需要具有非常低抖动的稳定波束定时。为了实现稳定的波束定时，我们采用了不同步到交流电源线的定时系统。磁合金加速腔和全数字低电平射频控制系统是实现光束精确相位控制的关键。对于高功率光束的加速，相位反馈回路是必要的，它可以抑制纵向偶极子振荡。相位环是引起波束提取时序抖动的原因之一。我们采用相位环的增益模式来避免在提取时对光束相位的影响。我们在1.7 ns内实现了高功率光束的极低抖动提取，这相当于提取时射频频率的1度。
The 3 GeV rapid cycling synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) delivers high intensity proton beams to the Materials and Life Science Facility (MLF) and the main ring (MR). The repetition rate of the RCS is 25 Hz. The typical operation period of the J-PARC is 3.2 s, which consists of 80 RCS cycles. Four beam pulses are for the MR and the other pulses are led into the MLF. Since a bucket-to-bucket injection scheme is used for the MR, the beam from the RCS must be injected with a precise phase to the proper rf bucket of the MR. In case of the MLF, the beam has to be synchronized to the Fermi chopper, which has a tolerance of only a few 100 ns. Thus, stable beam timings with a very low jitter are required for both destinations. To realize the stable beam timing, we employ the timing system, which is not synchronized to the AC power line. Also the magnetic-alloy accelerating cavities and the full digital low-level RF control system are the keys for the precise beam phase control. For acceleration of a high power beam, the phase feedback loop, which damps the longitudinal dipole oscillation, is necessary. The phase loop is a cause of the jitter of the beam extraction timing. We apply a gain pattern of the phase loop to avoid the influence on the beam phase at the extraction. We have achieved a very low jitter extraction of a high power beam within 1.7 ns, which corresponds to 1 degree of the rf frequency at the extraction.
使用 J-PARC MLF 中子源进行惰性中微子搜索
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日本质子加速器研究综合体 3-GeV 快速循环同步加速器的束流调试
DOI：
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发表时间：
2009
期刊：
Phys. Rev. 12
影响因子：
--
作者：
H. Hotchi;M. Kinsho;K. Hasegawa;N. Hayashi;Y. Hikichi;S. Hiroki;J. Kamiya;K. Kanazawa;M. Kawase;F. Noda;M. Nomura;N. Ogiwara;R. Saeki;P.K. Saha;A. Schnase;Y. Shobuda;T. Shimada;K. Suganuma;H. Suzuki;H. Takahashi;T. Takayanagi;O. Taked
通讯作者：
O. Taked