Effect of carbon divertor plates on impurities, Zeff and density limit in Large Helical Device

被引：23

作者：

Morita, S ^{[1
]}

Goto, M ^{[1
]}

Funaba, H ^{[1
]}

Idei, H ^{[1
]}

Ikeda, K ^{[1
]}

Inagaki, S ^{[1
]}

Kaneko, O ^{[1
]}

Kawahata, K ^{[1
]}

Komori, A ^{[1
]}

Kubo, S ^{[1
]}

Kumazawa, R ^{[1
]}

Masuzaki, S ^{[1
]}

Miyazawa, J ^{[1
]}

Morisaki, T ^{[1
]}

Motojima, O ^{[1
]}

Muto, S ^{[1
]}

Mutoh, T ^{[1
]}

Nakamura, Y ^{[1
]}

Narihara, K ^{[1
]}

Nishimura, K ^{[1
]}

Noda, N ^{[1
]}

Ohdachi, S ^{[1
]}

Ohyabu, N ^{[1
]}

Oka, Y ^{[1
]}

Osakabe, M ^{[1
]}

Sagara, A ^{[1
]}

Sakakibara, S ^{[1
]}

Sakamoto, R ^{[1
]}

Seki, T ^{[1
]}

Shimozuma, T ^{[1
]}

Shoji, M ^{[1
]}

Suzuki, H ^{[1
]}

Takeiri, Y ^{[1
]}

Tanaka, K ^{[1
]}

Toi, K ^{[1
]}

Tokuzawa, T ^{[1
]}

Tsumori, K ^{[1
]}

Yamada, H ^{[1
]}

Watanabe, KY ^{[1
]}

Watari, T ^{[1
]}

机构：

[1] Natl Inst Fus Sci, Gifu 5095292, Japan

来源：

PHYSICA SCRIPTA | 2001年 / T91卷

关键词：

D O I：

10.1238/Physica.Topical.091a00048

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

LHD (Large Helical Device) has been operated during 2 years after initiating the first plasma on March of 1998. During the first year (Ist and 2nd experimental campaigns) the discharges were mainly carried out with a low magnetic field of B-t = 1.5 T. Before the 3rd experimental campaign begin in 1999. carbon divertor plates were installed in the vacuum chamber at the end of the divertor legs. These were connected to the ergodic layer for the purpose of heat removal and separation from the vacuum wall (SS316L). After the installation metal impurities decreased and high influxes of carbon and oxygen were measured. During accumulated number of discharges the metal impurities increased and returned finally to the former level. The re-deposition of metals on the carbon plates was also observed. However, discharges were successful and the impurity level did not lower critically the plasma performance. The behaviour of impurities, Z(eff) (effective charge) and density limit is discussed and results from spectroscopic measurements are presented.

引用

页码：48 / 52

页数：5

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