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
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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
S. Masuzaki and Y. Ueda
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Oya;G. Motojima;M. Tokitani;H. Tanaka;S. Masuzaki and Y. Ueda

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在这项研究中,全球粒子平衡的氦(He)长脉冲放电与石墨偏滤器在大螺旋装置(LHD)的实验室规模的实验室实验中,以确定的作用,石墨偏滤器在LHD壁的He保留进行了比较。对仅采用涡轮分子泵的铲运机长脉冲放电进行了He粒子平衡分析。分析表明,静态He滞留量为102.9 × 1022 He,滞留率为104.5%。在实验室规模的研究中,通过热脱附光谱(TDS)测量离子辐照或等离子体暴露后的He保留。在所有条件下,He的保留率为0.1 ~ 0.5%,这与LHD结果很好地一致。因此,可以得出结论,石墨偏滤器瓦片在放电的初始阶段在LHD壁中的He吸收中具有重要作用。
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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