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(EX/S2-4) Disruption Mitigation Using High-Pressure Noble Gas Injection on DIII-D

D.G. Whyte¹⁾, T.C. Jernigan²⁾, D.A. Humphreys³⁾, A.W. Hyatt³⁾, C.J. Lasnier⁴⁾, P.B. Parks³⁾, T.E. Evans³⁾, P.L. Taylor³⁾, A.G. Kellman³⁾, D.S. Gray¹⁾, E.M. Hollmann^1)
 
1) University of California, San Diego, La Jolla, USA
²⁾ Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
³⁾ General Atomics, San Diego, California, USA
⁴⁾ Lawrence Livermore National Laboratory, Livermore, California, USA

Abstract.  High-pressure gas jet injection of neon and argon is shown to be a simple and robust method to mitigate the deleterious effects of disruptions on the DIII-D tokamak. The gas jet penetrates to the central plasma at its sonic velocity. The deposited species dissipates $\sim$100% of the plasma thermal energy by radiation and substantially reduces mechanical stresses on the vessel caused by poloidal halo currents. The gas jet species charge distribution can include > 50% fraction neutral species which inhibits runaway electrons. The favorable scaling of this technique to burning fusion plasmas is discussed. *Work supported by U.S. Department of Energy under Grant No. DE-FG03-95ER54294 and Contracts DE-AC05-00OR22725, DE-AC03-99ER54463, and W-7405-ENG-48.

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