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Author: Calvin K Lau
Requested Type: Poster
Submitted: 2016-02-15 22:02:58

Co-authors: D.P.Fulton,I.Holod,Z.Lin,M.Binderbauer,T.Tajima,L.Schmitz

Contact Info:
University of California, Irvine
4129 Frederick Reines Hall
Irvine, CA   92697-4
United States of Ame

Abstract Text:
Recent progress in the C-2 advanced beam-driven field-reversed configuration (FRC) experiment [Binderbauer 2015] at Tri Alpha Energy has led to consistently reproducible plasma lifetimes of 5+ ms, i.e. transport regimes. To understand the transport mechanisms, gyrokinetic particle simulations of drift-wave instabilities have been carried out for the FRC [Fulton 2016]. The realistic magnetic geometry of FRC is represented in Boozer coordinates in the upgraded gyrokinetic toroidal code (GTC) [Lin 1998]. Radially local simulations find the FRC core to be stable to ion scale modes for realistic pressure gradients. Outside of the separatrix, however, the scrape-off layer (SOL) is unstable to both ion and electron scale modes. These findings and linear instability thresholds found in simulation are consistent with the C-2 experimental measurements of density fluctuations [Schmitz 2015]. Driving mechanisms and stabilizing effects will also be discussed.