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

doi:10.1088/0741-3335/33/4/001

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 journal › Article › peer-review

48 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 language	English
Article number	001
Pages (from-to)	277-287
Number of pages	11
Journal	Plasma Physics and Controlled Fusion
Volume	33
Issue number	4
DOIs	https://doi.org/10.1088/0741-3335/33/4/001
State	Published - 1991
Externally published	Yes

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Marcus, F. B., Adams, J. M., Cheetham, A. D., Conroy, S., Core, W. G. F., Jarvis, O. N., Loughlin, M. J., Olsson, M., Sadler, G., Smeulders, P., Van Belle, P., & Watkins, N. (1991). JET neutron emission profiles and fast ion redistribution during sawtooth crashes. Plasma Physics and Controlled Fusion, 33(4), 277-287. Article 001. https://doi.org/10.1088/0741-3335/33/4/001

@article{268bcfbe2d0f46f4b9e25f9ee4d43ffa,

title = "JET neutron emission profiles and fast ion redistribution during sawtooth crashes",

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.",

author = "Marcus, \{F. B.\} and Adams, \{J. M.\} and Cheetham, \{A. D.\} and S. Conroy and Core, \{W. G.F.\} and Jarvis, \{O. N.\} and Loughlin, \{M. J.\} and M. Olsson and G. Sadler and P. Smeulders and \{Van Belle\}, P. and N. Watkins",

year = "1991",

doi = "10.1088/0741-3335/33/4/001",

language = "English",

volume = "33",

pages = "277--287",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

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TY - JOUR

T1 - JET neutron emission profiles and fast ion redistribution during sawtooth crashes

AU - Marcus, F. B.

AU - Adams, J. M.

AU - Cheetham, A. D.

AU - Conroy, S.

AU - Core, W. G.F.

AU - Jarvis, O. N.

AU - Loughlin, M. J.

AU - Olsson, M.

AU - Sadler, G.

AU - Smeulders, P.

AU - Van Belle, P.

AU - Watkins, N.

PY - 1991

Y1 - 1991

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/0012708866

U2 - 10.1088/0741-3335/33/4/001

DO - 10.1088/0741-3335/33/4/001

M3 - Article

AN - SCOPUS:0012708866

SN - 0741-3335

VL - 33

SP - 277

EP - 287

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 4

M1 - 001

ER -

JET neutron emission profiles and fast ion redistribution during sawtooth crashes

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