ECR discharge cleaning and followed He GDC on HT-7 tokamak

Y. W. Yu; X. Gao; J. S. Hu; J. G. Li; J. F. Shan

doi:10.1016/j.jnucmat.2009.01.287

ECR discharge cleaning and followed He GDC on HT-7 tokamak

Y. W. Yu
, X. Gao
, J. S. Hu
, J. G. Li
, J. F. Shan

School of Electrical Engineering

CAS - Institute of Plasma Physics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

A study of ECR discharge cleaning is conducted on HT-7. Radio frequency (RF) waves of 2.45 GHz were used under toroidal field of 0.088-0.066 T. Toroidally symmetric ECR plasmas were obtained, and the resonance layers were scanned by toroidal field. RF powers, neutral pressures and working gas species were investigated as parameters of cleaning. And ECR was compared with ICR discharge cleaning. After the cleaning, the enhancement of wall recycling and the increase of carbon and oxygen impurities were observed in the followed shots. Another ECR discharge cleaning was followed by He GDC, it was shown that the intensity of H_α radiation was much lower than that before cleaning. This indicates that D₂ ECR discharge cleaning followed by He GDC is effective for wall conditioning.

Original language	English
Pages (from-to)	1051-1054
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	390-391
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.287
State	Published - 15 Jun 2009

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title = "ECR discharge cleaning and followed He GDC on HT-7 tokamak",

abstract = "A study of ECR discharge cleaning is conducted on HT-7. Radio frequency (RF) waves of 2.45 GHz were used under toroidal field of 0.088-0.066 T. Toroidally symmetric ECR plasmas were obtained, and the resonance layers were scanned by toroidal field. RF powers, neutral pressures and working gas species were investigated as parameters of cleaning. And ECR was compared with ICR discharge cleaning. After the cleaning, the enhancement of wall recycling and the increase of carbon and oxygen impurities were observed in the followed shots. Another ECR discharge cleaning was followed by He GDC, it was shown that the intensity of Hα radiation was much lower than that before cleaning. This indicates that D2 ECR discharge cleaning followed by He GDC is effective for wall conditioning.",

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T1 - ECR discharge cleaning and followed He GDC on HT-7 tokamak

AU - Yu, Y. W.

AU - Gao, X.

AU - Hu, J. S.

AU - Li, J. G.

AU - Shan, J. F.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - A study of ECR discharge cleaning is conducted on HT-7. Radio frequency (RF) waves of 2.45 GHz were used under toroidal field of 0.088-0.066 T. Toroidally symmetric ECR plasmas were obtained, and the resonance layers were scanned by toroidal field. RF powers, neutral pressures and working gas species were investigated as parameters of cleaning. And ECR was compared with ICR discharge cleaning. After the cleaning, the enhancement of wall recycling and the increase of carbon and oxygen impurities were observed in the followed shots. Another ECR discharge cleaning was followed by He GDC, it was shown that the intensity of Hα radiation was much lower than that before cleaning. This indicates that D2 ECR discharge cleaning followed by He GDC is effective for wall conditioning.

AB - A study of ECR discharge cleaning is conducted on HT-7. Radio frequency (RF) waves of 2.45 GHz were used under toroidal field of 0.088-0.066 T. Toroidally symmetric ECR plasmas were obtained, and the resonance layers were scanned by toroidal field. RF powers, neutral pressures and working gas species were investigated as parameters of cleaning. And ECR was compared with ICR discharge cleaning. After the cleaning, the enhancement of wall recycling and the increase of carbon and oxygen impurities were observed in the followed shots. Another ECR discharge cleaning was followed by He GDC, it was shown that the intensity of Hα radiation was much lower than that before cleaning. This indicates that D2 ECR discharge cleaning followed by He GDC is effective for wall conditioning.

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DO - 10.1016/j.jnucmat.2009.01.287

M3 - 文章

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VL - 390-391

SP - 1051

EP - 1054

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1

ER -

ECR discharge cleaning and followed He GDC on HT-7 tokamak

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