CALCULATION OF AN UPPER LIMIT FOR AN EFFECTIVE FAST-ELECTRON DIFFUSION CONSTANT USING THE HARD X-RAY-CAMERA ON PBX-M

被引:13
作者
JONES, S
VONGOELER, S
BERNABEI, S
IGNAT, D
KESNER, J
KAITA, R
LUCKHARDT, S
PAOLETTI, F
RIMINI, F
机构
[1] PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543
[2] JET JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND
关键词
D O I
10.1088/0741-3335/35/8/008
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Fast electron localization and transport are important for tokamak current profile control schemes. The hard x-ray camera on PBX-M produces two-dimensional, time resolved tangential images of fast electron bremsstrahlung, from which a fast electron diffusion constant is calculated. Assuming a radially narrow lower hybrid power absorption profile, a momentum space absorption profile and a transport model [1], a model fast electron current density profile is calculated and compared to an experimentally derived profile, and the diffusion coefficient is adjusted until a good fit is found. Using this model, we compute an upper limit for an effective diffusion constant of D* less-than-or-equal-to 1.1 m2/sec to within a factor of two.
引用
收藏
页码:1003 / 1017
页数:15
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