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On Impurity Handling in High Performance Stellarator/Heliotron Plasmas
http://hdl.handle.net/10655/2909
http://hdl.handle.net/10655/2909edd29d0a-6f8a-4bb1-b1b1-80b4b7fc88b9
| Item type | 研究報告書 / Research Paper(1) | |||||||||||||||||||||||||||||||||||||
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| 公開日 | 2010-02-05 | |||||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||||
| タイトル | On Impurity Handling in High Performance Stellarator/Heliotron Plasmas | |||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||||||||||||||||
| 言語 | eng | |||||||||||||||||||||||||||||||||||||
| 資源タイプ | ||||||||||||||||||||||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||||||||||||||||||||||||||||||||||
| 資源タイプ | research report | |||||||||||||||||||||||||||||||||||||
| アクセス権 | ||||||||||||||||||||||||||||||||||||||
| アクセス権 | metadata only access | |||||||||||||||||||||||||||||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||||||||||||||||||||||||||||||||
| 著者 |
Burhenn, R.
× Burhenn, R.
× Feng, Y.
× Ida, K.
× Kalinina, D.
× Maassberg, H.
× McCarthy, K.J.
× Morita, S.
× Nakamura, Y.
× Nozato, H.
× Okamura, S.
× Sudo, S.
× Suzuki, C.
× Tamura, N.
× Weller, A.
× Yoshinuma, M.
× Zurro, B.
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| 抄録 | ||||||||||||||||||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||||||||||||||||||
| 内容記述 | The Large Helical Device (LHD) and Wendelstein 7-X (W7-X, under construction) are experiments specially designed to demonstrate long pulse (quasi steady-state) operation, which is an intrinsic property of Stellarators and Heliotrons. Significant progress was made in establishment of high performance plasmas. A crucial point is the increasing impurity confinement towards high density as observed at several machines (TJ-II, W7-AS, LHD) which can lead to impurity accumulation and early pulse termination by radiation collapse at high density. In addition, theoretical predictions for non-axisymmetric configurations prognosticate the absence of impurity screening by ion temperature gradients in standard ion root plasmas. Nevertheless, scenarios were found where impurity accumulation was successfully avoided in LHD and/or W7-AS by the onset of drag forces in the high density and low temperature scrape-off-layer, the generation of magnetic islands at the plasma boundary and to a certain degree also by ELMs, flushing out impurities and reducing the net-impurity influx into the core. Additionally, a reduction of impurity core confinement was observed in the W7-AS High Density Hmode (HDH) regime and by application of sufficient ECRH heating power. The exploration of such purification mechanisms is a demanding task for successful steady-state operation. The impurity transport at the plasma edge/SOL was identified to play a major role for the global impurity behaviour in addition to the core confinement. | |||||||||||||||||||||||||||||||||||||
| 書誌情報 |
en : Research Report NIFS-Series 発行日 2008-10-01 |
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| 報告書番号 | ||||||||||||||||||||||||||||||||||||||
| NIFS-945 | ||||||||||||||||||||||||||||||||||||||
| ISSN | ||||||||||||||||||||||||||||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||||||||||||||||||||||||||||
| 収録物識別子 | 0915-633X | |||||||||||||||||||||||||||||||||||||
