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Title: PHYSICS PROCESSES IN DISRUPTION MITIGATION USING MASSIVE NOBLE GAS INJECTION

Abstract

Methods for detecting imminent disruptions and mitigating disruption effects using massive injection of noble gases (He, Ne, or Ar) have been demonstrated on the DIII-D tokamak [1]. A jet of high injected gas density (> 10{sup 24} m{sup -3}) and pressure (> 20 kPa) penetrates the target plasma at the gas sound speed ({approx}300-500 m/s) and increases the atom/ion content of the plasma by a factor of > 50 in several milliseconds. UV line radiation from the impurity species distributes the plasma energy uniformly on the first wall, reducing the thermal load to the divertor by a factor of 10. Runaway electrons are almost completely eliminated by the large density of free and bound electrons supplied by the gas injection. The small vertical plasma displacement before current quench and high ratio of current decay rate to vertical growth rate result in a 75% reduction in peak halo current amplitude and attendant forces.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
GENERAL ATOMICS (US)
Sponsoring Org.:
(US)
OSTI Identifier:
804705
DOE Contract Number:  
AC03-99ER54463
Resource Type:
Conference
Resource Relation:
Conference: 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, Montreux (CH), 06/17/2002--06/21/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 29TH EUROPEAN PHYSICAL SOCIETY CONFERENCE ON PLASMA PHYSICS AND CONTROLLED FUSION, JUNE 17-21,2002, IN MONTREUX SWITZERLAND, AND TO BE PBLISHED IN THE ''PROCEEDINGS''; PBD: 1 Jul 2002
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; DECAY; DIVERTORS; DOUBLET-3 DEVICE; ELECTRONS; FIRST WALL; GAS INJECTION; MITIGATION; PHYSICS; RADIATIONS; RARE GASES; RUNAWAY ELECTRONS; TARGETS; VELOCITY

Citation Formats

HUMPHREYS, D A, WHYTE, D G, JERNIGAN, T C, EVANS, T E, GRAY, D S, HOLLMANN, E M, HYATT, A W, KELLMAN, A G, LASNIER, C J, PARKS, P B, and TAYLOR, P L. PHYSICS PROCESSES IN DISRUPTION MITIGATION USING MASSIVE NOBLE GAS INJECTION. United States: N. p., 2002. Web.
HUMPHREYS, D A, WHYTE, D G, JERNIGAN, T C, EVANS, T E, GRAY, D S, HOLLMANN, E M, HYATT, A W, KELLMAN, A G, LASNIER, C J, PARKS, P B, & TAYLOR, P L. PHYSICS PROCESSES IN DISRUPTION MITIGATION USING MASSIVE NOBLE GAS INJECTION. United States.
HUMPHREYS, D A, WHYTE, D G, JERNIGAN, T C, EVANS, T E, GRAY, D S, HOLLMANN, E M, HYATT, A W, KELLMAN, A G, LASNIER, C J, PARKS, P B, and TAYLOR, P L. Mon . "PHYSICS PROCESSES IN DISRUPTION MITIGATION USING MASSIVE NOBLE GAS INJECTION". United States. https://www.osti.gov/servlets/purl/804705.
@article{osti_804705,
title = {PHYSICS PROCESSES IN DISRUPTION MITIGATION USING MASSIVE NOBLE GAS INJECTION},
author = {HUMPHREYS, D A and WHYTE, D G and JERNIGAN, T C and EVANS, T E and GRAY, D S and HOLLMANN, E M and HYATT, A W and KELLMAN, A G and LASNIER, C J and PARKS, P B and TAYLOR, P L},
abstractNote = {Methods for detecting imminent disruptions and mitigating disruption effects using massive injection of noble gases (He, Ne, or Ar) have been demonstrated on the DIII-D tokamak [1]. A jet of high injected gas density (> 10{sup 24} m{sup -3}) and pressure (> 20 kPa) penetrates the target plasma at the gas sound speed ({approx}300-500 m/s) and increases the atom/ion content of the plasma by a factor of > 50 in several milliseconds. UV line radiation from the impurity species distributes the plasma energy uniformly on the first wall, reducing the thermal load to the divertor by a factor of 10. Runaway electrons are almost completely eliminated by the large density of free and bound electrons supplied by the gas injection. The small vertical plasma displacement before current quench and high ratio of current decay rate to vertical growth rate result in a 75% reduction in peak halo current amplitude and attendant forces.},
doi = {},
url = {https://www.osti.gov/biblio/804705}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {7}
}

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