The role of the graphite divertor tiles in helium retention on the LHD wall
The role of the graphite divertor tiles in helium retention on the LHD wall
复制标题
石墨偏滤器瓦在 LHD 壁上保留氦气方面的作用
DOI:
10.1016/j.nme.2017.07.006
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发表时间:
2017
影响因子:
2.6
通讯作者:
S. Masuzaki and Y. Ueda
中科院分区:
文献类型:
--
作者:
M. Oya;G. Motojima;M. Tokitani;H. Tanaka;S. Masuzaki and Y. Ueda
In this study, global particle balance of helium (He) long pulse discharge with graphite divertor in the Large Helical Device (LHD) and He retention in graphite from lab-scale experiments were compared in order to determine the role of the graphite divertor in He retention on the LHD wall. Global He particle balance analysis was conducted in long-pulse discharges in LHD with only turbo molecular pump. The analysis showed that static He retention was ∼2.9 × 1022He and the ratio of retained He (= retention over fluence) was ∼0.45%. In the lab-scale study, He retention was measured by Thermal Desorption Spectroscopy (TDS) after ion irradiation or plasma exposure. The ratio of retained He were 0.1 ∼ 0.5% in all conditions, which was well consistent with LHD results. Therefore, it may be concluded that graphite divertor tiles have an important role in He absorption in the LHD wall at the initial phase of discharges.
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