Measurements of impurity and heat dynamics during noble gas jet-initiated fast plasma shutdown for disruption mitigation in DIII-D

E. M. Hollmann*, T. C. Jernigan, M. Groth, D. G. Whyte, D. S. Gray, M. E. Austin, B. D. Bray, D. P. Brennan, N. H. Brooks, T. E. Evans, D. A. Humphreys, C. J. Lasnier, R. A. Moyer, A. G. McLean, P. B. Parks, V. Rozhansky, D. L. Rudakov, E. J. Strait, W. P. West

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

75 Citations (Scopus)

Abstract

Impurity deposition and mixing during gas jet-initiated plasma shutdown is studied using a rapid (∼5 ms), massive (∼1022 particles) injection of neon or argon into stationary DIII-D H-mode discharges. Fast-gated camera images indicate that the neutral deposition remains fairly localized near the injection port and does not penetrate far into the plasma pedestal. Nevertheless, fast bolometry indicates that high (50-100%) thermal quench radiated power fractions are achieved; this appears to be facilitated through a combination of fast ion mixing and fast heat transport, both driven by large-scale magnetohydrodynamic activity. These experiments suggest that massive gas injection might be viable for disruption mitigation in future tokamaks even if core penetration of jet neutrals is not achieved.

Original languageEnglish
Pages (from-to)1046-1055
Number of pages10
JournalNuclear Fusion
Volume45
Issue number9
DOIs
Publication statusPublished - 22 Aug 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

Dive into the research topics of 'Measurements of impurity and heat dynamics during noble gas jet-initiated fast plasma shutdown for disruption mitigation in DIII-D'. Together they form a unique fingerprint.

Cite this