Observations of x-ray spectra from highly charged tungsten ions in tokamak plasmas

被引:71
作者
Neu, R
Fournier, KB
Schlogl, D
Rice, J
机构
[1] LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550
[2] MIT,PLASMA SCI & FUS CTR,CAMBRIDGE,MA 02139
关键词
D O I
10.1088/0953-4075/30/21/036
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
X-ray spectra in the range 7-10 Angstrom from highly charged tungsten (Z = 74) ions were observed in the tokamak ASDEX Upgrade. Lines emitted from W37+ to W47+ were identified by comparison with ab initio calculations and with the expected ionization equilibrium charge-state distribution. Most of the features in the observed spectra coincide with predicted lines. A spectral line of As I-like W41+ could be identified as the predominant one for plasmas with 2.5-3 keV central electron temperature. The calculations predict clearly separated spectral lines for Kr I-like W at about 18.4 Angstrom and strong lines between 5.6 and 6.0 Angstrom for all charge states under consideration that can be used for monitoring W densities in the soft x-ray region. Tungsten concentrations in the range of 10(-4) were extracted from the emissivities of spectral lines from W40+ and W41+.
引用
收藏
页码:5057 / 5067
页数:11
相关论文
共 35 条
[1]  
ARUNASALAM V, 1978, P 8 C EPS PRAG 1977, V2, P17
[2]  
ASMUSSEN K, 1997, UNPUB NUCL FUSION
[3]  
ASMUSSEN K, 1995, 102 IPP TU
[4]   NJGRAF - AN EFFICIENT PROGRAM FOR CALCULATION OF GENERAL RECOUPLING COEFFICIENTS BY GRAPHICAL ANALYSIS, COMPATIBLE WITH NJS']JSYM [J].
BARSHALOM, A ;
KLAPISCH, M .
COMPUTER PHYSICS COMMUNICATIONS, 1988, 50 (03) :375-393
[5]   ELECTRON COLLISION EXCITATIONS IN COMPLEX SPECTRA OF IONIZED HEAVY-ATOMS [J].
BARSHALOM, A ;
KLAPISCH, M ;
OREG, J .
PHYSICAL REVIEW A, 1988, 38 (04) :1773-1784
[6]  
Behringer K., 1988, Description of the impurity transport code `STRAHL'
[7]  
BRETON C, 1978, 948 EURATOMCEAFC
[8]  
DEPENAHEMPEL S, 1997, 108 IPP
[9]   MEASUREMENTS OF LINE OVERLAP FOR RESONANT SPOILING OF X-RAY LASING TRANSITIONS IN NICKEL-LIKE TUNGSTEN [J].
ELLIOTT, SR ;
BEIERSDORFER, P ;
MACGOWAN, BJ ;
NILSEN, J .
PHYSICAL REVIEW A, 1995, 52 (04) :2689-2692
[10]   SOFT-X-RAY BANDS OF HIGHLY IONIZED TUNGSTEN, GOLD AND LEAD EMITTED BY THE TEXT TOKAMAK PLASMA [J].
FINKENTHAL, M ;
HUANG, LK ;
LIPPMANN, S ;
MOOS, HW ;
MANDELBAUM, P ;
SCHWOB, JL ;
KLAPISCH, M .
PHYSICS LETTERS A, 1988, 127 (05) :255-258