Survey of energetic particle modes in the advanced FRC

R. M. Magee
Tuesday, March 12, 2019
11:00 am
FRH 4179
The advanced field-reversed configuration (FRC) plasmas produced in the C-2 [1], C-2U [2], and C-2W [3] devices at TAE Technologies provide a fast ion environment distinct from tokamaks and other low beta toroidal confinement devices.  In terms of neutral beam power density and relative fast ion orbit size, these devices are more akin to beam-injected mirror machines than tokamaks, but the closed field lines and high beta FRC core give it, and the energetic particle modes it supports, an altogether unique character.
In this presentation I will provide an experimental characterization of three modes:  a beam-driven Ion Bernstein wave that is observed to accelerate plasma ions to high energies on very short timescales [4]; a chirping mode that redistributes fast ions in space [5]; and a driven compressional Alfven wave reminiscent of compressional Alfven Eigenmodes (CAEs) in spherical tokamaks [6].  None of these modes are observed to have a deleterious effect on global plasma energy confinement or limit accumulation of fast ions. 
[1] M.W. Binderbauer et al, Physical Review Letters 105, 045003 (2010)
[2] M.W. Binderbauer et al, AIP Conference Proceedings 1721, 030003 (2016)
[3] H. Gota et al, Nuclear Fusion (in print)
[4] R.M. Magee et al, Nature Physics 15, 281-286 (2019)
[5] B.H. Deng et al, Nuclear Fusion 58,126026 (2018)
[6] R.M. Magee et al, Nuclear Fusion 58, 082011 (2018)
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