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Measurements of Impurity and Heat Dynamics During Noble Gas Jet-Initiated Fast Plasma Shutdown for Disruption Mitigation in DIII-D.

D. S. GrayD. A. HumphreysT. E. EvansW. P. WestP. B. ParksC. J. LasnierD. L. RudakovR. A. MoyerD. G. WhyteN. H. BrooksM. GrothE. M. HollmannT. C. JerniganD. P. BrennanA. McCleanV. RozhanskyE. J. Strait

出版	United States. Department of Energy, 2004
URL	http://books.google.com.hk/books?id=my3cjwEACAAJ&hl=&source=gbs_api

註釋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.