TH1AA01
RIKEN Nishina Center, Wako, Japan
* RIKEN Accel. Prog. Rep. 52 (2019) p.14
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TH1AA01 |
Nitrogen Gas-Jet Curtain for Windowless Helium Gas Cell Equipped With Differential Pumping Systems | |
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Windowless helium gas cells are used for heavy ion beam charge strippers, high intensity beam targets, and GARIS (GAs-filled Recoil Ion Separator) for nuclear physics experiments. They are usually accompanied by a differential pumping system, but due to the high diffusion rate of helium gas, helium gas diffuses into the region where a high vacuum is required, and as a result, it is difficult to increase the helium gas pressure. To solve this problem, we invented the "nitrogen gas curtain". This not only prevents helium gas from leaking out to the high vacuum side, but also allows nitrogen to leak out instead of helium, making it easier to increase the vacuum level. This system has been incorporated into the gas stripper and the GARIS-3 apparatus at the RIKEN RIBF and continues to operate stably. In this talk, the concept, design method, utility, and performance of the nitrogen gas curtain will be explained in detail*.
* RIKEN Accel. Prog. Rep. 52 (2019) p.14 |
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