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Electron Pressure Profiles in High-Density Neutral Beam Heated Plasmas in the Large Helical Device
http://hdl.handle.net/10655/5373
http://hdl.handle.net/10655/5373e976eb8a-8950-4339-8e49-4ab579ee4882
名前 / ファイル | ライセンス | アクション |
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142.pdf (392.3 kB)
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Item type | 学術雑誌論文 / Journal Article_02(1) | |||||
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公開日 | 2011-01-31 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Electron Pressure Profiles in High-Density Neutral Beam Heated Plasmas in the Large Helical Device | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | LHD | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | high-density | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | plateau regime | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | frozen profile | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | stiffness | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | energy confinement | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
MIYAZAWA, Junichii
× MIYAZAWA, Junichii× YAMADA, Hiroshi× PETERSON, Byron J.× MURAKAMI, Sadayoshi× FUNABA, Hisamichi× OSAKABE, Masaki× TANAKA, Kenji× SAKAKIBARA, Satoru× LHD, Experimental Group |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | In the Large Helical Device (LHD), electron pressure profiles in gas-fueled high-density discharges tend to have a similar shape, as if these were frozen. This frozen profile is insensitive to variations in the magnetic field strength and moderate changes in the neutral beam heat deposition profile. At the same time, however, the absolute value of the electron pressure itself increases with the heating power, the electron density, and the magnetic field strength. In this study, a reference model for the electron pressure is proposed which consists of the frozen profile and parametric dependences derived from experimental observations. It is possible to define an operational regime where this typical profile appears by comparing the electron pressure profiles with this model. In the standard configuration, at which the maximum plasma stored energy in LHD has been obtained, the frozen profile appears in the plateau to the Pfirsh-Schl?ter regimes. As the collisionality decreases to the collisionless regime, the electron pressure becomes smaller than the prediction of the model and the deterioration is significant in the plasma core region. This tendency is enhanced in the configuration with the outward-shifted magnetic axis. The global energy confinement time, τE, in the high-collisionality regime has a weaker density dependence together with the mitigated power degradation, scaling as τE∝nebar0.28P-0.43 (nebar and P are the line-averaged density and the heating power, respectively), compared with the International Stellarator Scaling 95, where τE∝nebar0.51P-0.59. | |||||
書誌情報 |
en : プラズマ・核融合学会誌 巻 Vol. 81, p. No. 4 pp.302-311, 発行日 2005-04-01 |
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出版者 | ||||||
出版者 | プラズマ・核融合学会 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1585/jspf.81.302 |