Modelling of deuterium emission in high density divertor plasmas in JET

被引：23
|
作者：
Maggi, CF [1 ]
Horton, LD
Corrigan, G
Jäckel, HJ
Loarte, A
Monk, RD
Simonini, R
Stamp, M
Taroni, A
机构：
[1] Jet Joint Undertaking, Abingdon OX14 3EA, Oxon, England
[2] Max Planck Inst Plasmaphys, Net Team, D-85748 Garching, Germany
来源：
JOURNAL OF NUCLEAR MATERIALS | 1999年 / 266卷
关键词：
JET; deuterium emission; divertor modeling;
D O I：
10.1016/S0022-3115(98)00845-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Simulations of neutral deuterium emission from high density Ohmic and L-mode JET divertor discharges with the EDGE2D/NIMBUS codes are presented. At high density the codes fail to reproduce quantitatively the steady increase of divertor D-0 emission with rising plasma density observed in the experiment. However, good agreement is obtained with the measured D-gamma/D-alpha ratio in inner and outer divertor despite the total plasma volume recombination being small in the simulations. The asymmetry between inner and outer divertor detachment is found to depend on the strength of the charge exchange momentum losses. Recombination alone is not sufficient to obtain strong detachment in the inner divertor. Measurements of Ly(beta)/D-alpha emission profiles across the JET divertor show signs of Lyman radiation reabsorption in the inner divertor at high density. The first attempt at including divertor plasma opacity corrections self-consistently in EDGE2D/NIMBUS simulations of high density JET L-mode discharges is presented. The effect of opacity on the simulated deuterium emission and on the 2D plasma solution is discussed. (C) 1999 JET Joint Undertaking, published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码：867 / 872
页数：6
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