JET neutron emission profiles and fast ion redistribution during sawtooth crashes

F. B. Marcus, J. M. Adams, A. D. Cheetham, S. Conroy, W. G.F. Core, O. N. Jarvis, M. J. Loughlin, M. Olsson, G. Sadler, P. Smeulders, P. Van Belle, N. Watkins

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

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 1016 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.

Original languageEnglish
Article number001
Pages (from-to)277-287
Number of pages11
JournalPlasma Physics and Controlled Fusion
Volume33
Issue number4
DOIs
StatePublished - 1991
Externally publishedYes

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