Design and commissioning of the RIKEN cryogenic electrostatic ring (RICE)
Design and commissioning of the RIKEN cryogenic electrostatic ring (RICE)
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DOI：
10.1063/1.4978454
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发表时间：
2017-03-01
影响因子：
1.6
通讯作者：
Azuma, T.
中科院分区：
文献类型：
--
作者：
Nakano, Y.;Enomoto, Y.;Azuma, T.
一种新的静电离子储存环，RIKEN低温静电环，已经在低温条件下投入使用了15 kev的离子束。该环设计了一个封闭的离子束轨道，轨道长度约为2.9 m，离子束完全由静电分量引导。环的真空室使用无he液冷却系统冷却到4.2 K，校准硅二极管传感器测量的所有位置的温差最多为0.4 K。2014年8月，首次使用15 kev的Ne+束流进行了低温手术。在测量过程中，Ne+束被储存在4.2 K的环温下，剩余气体寿命超过10 min。这样可以估计残余气体密度在10(4)cm（-3）左右，这对应于室温等效压力约为1 x 10(-10) Pa。通过对拾取光束探测器的监测，可以清楚地识别出环中聚束腔的纵向脉冲压缩效应。介绍了储水环的详细设计和机械结构，以及试运行结果。
A new electrostatic ion storage ring, the RIKEN cryogenic electrostatic ring, has been commissioned with a 15-keV ion beam under cryogenic conditions. The ring was designed with a closed ion beam orbit of about 2.9 m, where the ion beam is guided entirely by electrostatic components. The vacuum chamber of the ring is cooled using a liquid-He-free cooling system to 4.2 K with a temperature difference of 0.4 K at most within all the positions measured by calibrated silicon diode sensors. The first cryogenic operation with a 15-keV Ne+ beam was successfully performed in August 2014. During the measurement, the Ne+ beam was stored under a ring temperature of 4.2 K with a residual gas lifetime of more than 10 min. This permits an estimation of the residual gas density at a few 10(4) cm(-3), which corresponds to a room-temperature-equivalent pressure of around 1 x 10(-10) Pa. An effect of longitudinal pulse compression at the bunching cavity in the ring was clearly identified by monitoring the pick-up beam detector. The detailed design and mechanical structure of the storage ring, as well as the results from the commissioning run, are reported.