The detection of fast oxygen ions in neutral beam-heated plasmas of the TJ-II stellarator using spectroscopy methods

被引：10

作者：

McCarthy, Kieran J. ^{[1
]}

Tribaldos, V. ^{[2
]}

Arevalo, J. ^{[1
]}

Liniers, M. ^{[1
]}

机构：

[1] CIEMAT, Lab Nacl Fus, E-28040 Madrid, Spain

[2] Univ Carlos III Madrid, Dept Phys, Madrid, Spain

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2010年 / 43卷 / 14期

关键词：

CHARGE-EXCHANGE SPECTROSCOPY; LOSS CONE STRUCTURE; CROSS-SECTIONS; IONIZATION; CAPTURE;

D O I：

10.1088/0953-4075/43/14/144020

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

During heating, by neutral beam injection, of magnetically confined plasmas in the TJ-II stellarator broad spectral structures, that straddle intense emission lines from multiply ionized oxygen ions, are observed by a normal-incidence spectrometer viewing a plasma region well separated from the neutral beam/plasma interaction volume. These features are seen to appear and to disappear shortly after neutral beam switch-on and switch-off, respectively. After excluding other possible origins it is demonstrated that their source is fast oxygen ions that originate as accelerated H2O and H3O ions in the ion sources of the neutral beam injectors. Next, discussions on how fast multiply ionized ions can perform multiple toroidal transits about this device, thereby giving rise to the spectral structures observed, are presented. Finally, implications of these emissions for spectral analysis and interpretation of spectra in hot magnetically confined plasmas are addressed.

引用

页数：8

共 23 条

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[23] The response of a fast scintillator screen (YAP:Ce) to low energy ions (0-40 keV) and its use to detect fast-ion-loss in stellarator TJ-II
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