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

Autor:	Adam McLean, Dmitry Rudakov, D.G. Whyte, P. B. Parks, W.P. West, David Humphreys, M. Groth, N.H. Brooks, C.J. Lasnier, E. J. Strait, E. M. Hollmann, D. P. Brennan, R.A. Moyer, D. S. Gray, Max E Austin, T.C. Jernigan, V. A. Rozhansky, B.D. Bray, Todd Evans
Rok vydání:	2005
Předmět:	Nuclear and High Energy Physics Tokamak Materials science Argon DIII-D Magnetic confinement fusion chemistry.chemical_element Noble gas Plasma Condensed Matter Physics law.invention Neon chemistry Physics::Plasma Physics law Plasma diagnostics Atomic physics
Zdroj:	Nuclear Fusion. 45:1046-1055
ISSN:	1741-4326 0029-5515
Popis:	Impurity deposition and mixing during gas jet-initiated plasma shutdown is studied using a rapid ({approx}2 ms), massive ({approx}10{sup 22} particles) injection of neon or argon into stationary DIII-D H-mode discharges. Fast-gated camera images indicate that the bulk of the jet neutrals do not penetrate far into the plasma pedestal. Nevertheless, high ({approx}90%) 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 MHD activity. Also, runaway electron suppression is achieved for sufficiently high gas jet pressures. These experiments suggest that massive gas injection could be viable for disruption mitigation in future tokamaks even if core penetration of jet neutrals is not achieved.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0de15e7f016c8f833a99b80a832fcaf7 https://doi.org/10.1088/0029-5515/45/9/003 Zobrazit plný text záznamu