TY - JOUR
T1 - The role of the graphite divertor tiles in helium retention on the LHD wall
AU - Oya, M.
AU - Motojima, G.
AU - Tokitani, M.
AU - Tanaka, H.
AU - Masuzaki, S.
AU - Ueda, Y.
N1 - Funding Information:
This work is performed with the support of the LHD Operation Group and auspices of NIFS Collaboration Research program (NIFS13KOBF025). In addition, this work was supported by JSPS KAKENHI Grant Number JP26-839 .
PY - 2017/12
Y1 - 2017/12
N2 - 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 × 1022 He 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.
AB - 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 × 1022 He 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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U2 - 10.1016/j.nme.2017.07.006
DO - 10.1016/j.nme.2017.07.006
M3 - Article
AN - SCOPUS:85026628288
SN - 2352-1791
VL - 13
SP - 58
EP - 62
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
ER -