JET NEUTRON EMISSION PROFILES AND FAST ION REDISTRIBUTION DURING SAWTOOTH CRASHES

被引:47
作者
MARCUS, FB [1 ]
ADAMS, JM [1 ]
CHEETHAM, AD [1 ]
CONROY, S [1 ]
CORE, WGF [1 ]
JARVIS, ON [1 ]
LOUGHLIN, MJ [1 ]
OLSSON, M [1 ]
SADLER, G [1 ]
SMEULDERS, P [1 ]
VANBELLE, P [1 ]
WATKINS, N [1 ]
机构
[1] HARWELL LAB,AEA IND TECHNOL,DIDCOT OX11 ORA,ENGLAND
关键词
D O I
10.1088/0741-3335/33/4/001
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
Measurements from the JET neutron profile monitor are analyzed tomographically to deduce the 2-D spatial distribution of neutron emissivity during NBI heating both before and after sawtooth crashes. In a discharge where the global neutron emission decreases slightly to 5/6 of the pre-crash rate of nearly 10(16) n s-1, the axial emissivity drops much more to only 1/6 of the pre-crash value. The sources of neutron emissivity are analyzed with an analytic Fokker-Planck formulation. The main change in neutron emissivity is due to fast ion redistribution during a sawtooth crash and a decrease in beam-beam-produced emissivity. The deduced fast ion redistribution is consistent with other observations of sawtooth behaviour in JET.
引用
收藏
页码:277 / 287
页数:11
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