Temperature-controlled graphite limiter experiments in CHS plasma

A. Sagara; T. Shoji; N. Noda; M. Fujiwara; M. Hosokawa; K. Ida; Hiroshi Idei; H. Iguchi; O. Kaneko; A. Karita; S. Kubo; K. Matsuoka; O. Motojima; S. Morita; K. Nishimura; S. Okamura; K. Okazaki; T. Ozaki; K. Sato; H. Sanuki; C. Takahasi; Y. Takeiri; Y. Takita; K. Tsuzuki; H. Yamada

doi:10.1016/0022-3115(90)90041-K

Temperature-controlled graphite limiter experiments in CHS plasma

A. Sagara, T. Shoji, N. Noda, M. Fujiwara, M. Hosokawa, K. Ida, Hiroshi Idei, H. Iguchi, O. Kaneko, A. Karita, S. Kubo, K. Matsuoka, O. Motojima, S. Morita, K. Nishimura, S. Okamura, K. Okazaki, T. Ozaki, K. Sato, H. SanukiC. Takahasi, Y. Takeiri, Y. Takita, K. Tsuzuki, H. Yamada

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Abstract

A movable graphite limiter with an internal heater has been installed in the heliotron/torsatron type compact helical system (CHS). Comparing discharges with and without the limiter the origin of major impurities and the role of the limiter are discussed. Infrared TV measurements reveal that there are two hot spots on the limiter due to heat loading and their temperatures depend on the electron density and/or the magnetic field direction. Limiter temperature dependence of measured CH/H_γ, CI, CII, OII, CH⁺₃, OV and total radiation loss is compared. From these experiments it is concluded that CH₄ molecules produced chemically on the limiter are presumed to recycle rapidly near the limiter and both carbon and oxygen impurities result probably from CO produced chemically on the limiter with oxygen which is predominant in CHS and originates mostly from the first wall. At surface temperatures above 900 ° C the limiter effect on impurities is observable in the main plasma.

Original language	English
Pages (from-to)	174-179
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	176-177
Issue number	C
DOIs	https://doi.org/10.1016/0022-3115(90)90041-K
Publication status	Published - Dec 3 1990
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Materials Science(all)
Nuclear Energy and Engineering

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10.1016/0022-3115(90)90041-K

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Sagara, A., Shoji, T., Noda, N., Fujiwara, M., Hosokawa, M., Ida, K., Idei, H., Iguchi, H., Kaneko, O., Karita, A., Kubo, S., Matsuoka, K., Motojima, O., Morita, S., Nishimura, K., Okamura, S., Okazaki, K., Ozaki, T., Sato, K., ... Yamada, H. (1990). Temperature-controlled graphite limiter experiments in CHS plasma. Journal of Nuclear Materials, 176-177(C), 174-179. https://doi.org/10.1016/0022-3115(90)90041-K

Sagara, A, Shoji, T, Noda, N, Fujiwara, M, Hosokawa, M, Ida, K, Idei, H, Iguchi, H, Kaneko, O, Karita, A, Kubo, S, Matsuoka, K, Motojima, O, Morita, S, Nishimura, K, Okamura, S, Okazaki, K, Ozaki, T, Sato, K, Sanuki, H, Takahasi, C, Takeiri, Y, Takita, Y, Tsuzuki, K & Yamada, H 1990, 'Temperature-controlled graphite limiter experiments in CHS plasma', Journal of Nuclear Materials, vol. 176-177, no. C, pp. 174-179. https://doi.org/10.1016/0022-3115(90)90041-K

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title = "Temperature-controlled graphite limiter experiments in CHS plasma",

abstract = "A movable graphite limiter with an internal heater has been installed in the heliotron/torsatron type compact helical system (CHS). Comparing discharges with and without the limiter the origin of major impurities and the role of the limiter are discussed. Infrared TV measurements reveal that there are two hot spots on the limiter due to heat loading and their temperatures depend on the electron density and/or the magnetic field direction. Limiter temperature dependence of measured CH/Hγ, CI, CII, OII, CH+3, OV and total radiation loss is compared. From these experiments it is concluded that CH4 molecules produced chemically on the limiter are presumed to recycle rapidly near the limiter and both carbon and oxygen impurities result probably from CO produced chemically on the limiter with oxygen which is predominant in CHS and originates mostly from the first wall. At surface temperatures above 900 ° C the limiter effect on impurities is observable in the main plasma.",

author = "A. Sagara and T. Shoji and N. Noda and M. Fujiwara and M. Hosokawa and K. Ida and Hiroshi Idei and H. Iguchi and O. Kaneko and A. Karita and S. Kubo and K. Matsuoka and O. Motojima and S. Morita and K. Nishimura and S. Okamura and K. Okazaki and T. Ozaki and K. Sato and H. Sanuki and C. Takahasi and Y. Takeiri and Y. Takita and K. Tsuzuki and H. Yamada",

year = "1990",

month = dec,

day = "3",

doi = "10.1016/0022-3115(90)90041-K",

language = "English",

volume = "176-177",

pages = "174--179",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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TY - JOUR

T1 - Temperature-controlled graphite limiter experiments in CHS plasma

AU - Sagara, A.

AU - Shoji, T.

AU - Noda, N.

AU - Fujiwara, M.

AU - Hosokawa, M.

AU - Ida, K.

AU - Idei, Hiroshi

AU - Iguchi, H.

AU - Kaneko, O.

AU - Karita, A.

AU - Kubo, S.

AU - Matsuoka, K.

AU - Motojima, O.

AU - Morita, S.

AU - Nishimura, K.

AU - Okamura, S.

AU - Okazaki, K.

AU - Ozaki, T.

AU - Sato, K.

AU - Sanuki, H.

AU - Takahasi, C.

AU - Takeiri, Y.

AU - Takita, Y.

AU - Tsuzuki, K.

AU - Yamada, H.

PY - 1990/12/3

Y1 - 1990/12/3

N2 - A movable graphite limiter with an internal heater has been installed in the heliotron/torsatron type compact helical system (CHS). Comparing discharges with and without the limiter the origin of major impurities and the role of the limiter are discussed. Infrared TV measurements reveal that there are two hot spots on the limiter due to heat loading and their temperatures depend on the electron density and/or the magnetic field direction. Limiter temperature dependence of measured CH/Hγ, CI, CII, OII, CH+3, OV and total radiation loss is compared. From these experiments it is concluded that CH4 molecules produced chemically on the limiter are presumed to recycle rapidly near the limiter and both carbon and oxygen impurities result probably from CO produced chemically on the limiter with oxygen which is predominant in CHS and originates mostly from the first wall. At surface temperatures above 900 ° C the limiter effect on impurities is observable in the main plasma.

AB - A movable graphite limiter with an internal heater has been installed in the heliotron/torsatron type compact helical system (CHS). Comparing discharges with and without the limiter the origin of major impurities and the role of the limiter are discussed. Infrared TV measurements reveal that there are two hot spots on the limiter due to heat loading and their temperatures depend on the electron density and/or the magnetic field direction. Limiter temperature dependence of measured CH/Hγ, CI, CII, OII, CH+3, OV and total radiation loss is compared. From these experiments it is concluded that CH4 molecules produced chemically on the limiter are presumed to recycle rapidly near the limiter and both carbon and oxygen impurities result probably from CO produced chemically on the limiter with oxygen which is predominant in CHS and originates mostly from the first wall. At surface temperatures above 900 ° C the limiter effect on impurities is observable in the main plasma.

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JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - C

ER -

Temperature-controlled graphite limiter experiments in CHS plasma

Abstract

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