Measurements of impurity and heat dynamics during noble gas jet-initiated fast plasma shutdown for disruption mitigation in DIII-D
Year: 2005
Type: article
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. Finally, 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.
Source: Nuclear Fusion
Institutions: University of California San Diego, Oak Ridge National Laboratory, Lawrence Livermore National Laboratory, University of Wisconsin–Madison, The University of Texas at Austin, General Atomics (United States), Massachusetts Institute of Technology, University of Toronto, Peter the Great St. Petersburg Polytechnic University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: U.S. Department of Energy
Awards: G1702950523, G222768804, G2596126017, G2988778103, G660437508, DIII-D EDGE PLASMA DISRUPTIONS AND RADIATIVE PROCESSES, THE DIII-D NATIONAL FUSION PROGRAM AND ADVANCED FUSION TECHNOLOGY RESEARCH AND DEVELOPMENT, G8527315880, THE DIII-D FUSION RESEARCH PROGRAM AND ADVANCED FUSION TECHNOLOGY RESEARCH AND DEVELOPMENT, MEASUREMENTS AND ACTIVE CONTROL OF TOKAMAK EDGE AND DIVERTORPLASMAS, DISRUPTION MITIGATION USING HIGH PRESSURE GAS JETS: EXTRAPOLATION TO BURNING PLASMA EXPERIMENTS
OpenAlex ID: W2020793970