M A Van Zeeland et al 2008 Plasma Phys. Control. Fusion 50 035009 doi:10.1088/0741-3335/50/3/035009
M A Van Zeeland1, W W Heidbrink2, R Nazikian3, W M Solomon3, M E Austin4, H L Berk5, N N Gorelenkov3, C T Holcomb6, A W Hyatt1, G J Kramer3, J Lohr1, M A Makowski6, G R McKee7, C C Petty1, S E Sharapov8 and T L Rhodes9
Show affiliationsReversed shear Alfvén eigenmode (RSAE) activity in DIII-D is stabilized by electron cyclotron heating (ECH) applied near the minimum of the magnetic safety factor (qmin) in neutral beam heated discharges with reversed-magnetic shear. The degree of RSAE stabilization, fast ion density and the volume averaged neutron production (Sn) are highly dependent on ECH deposition location relative to qmin. While discharges with ECH stabilization of RSAEs have higher Sn and more peaked fast ion profiles than discharges with significant RSAE activity, neutron production remains strongly reduced (up to 60% relative to TRANSP predictions assuming classical fast ion transport) even when RSAEs are stabilized.
52.55.Fa Tokamaks, spherical tokamaks
52.50.Sw Plasma heating by microwaves; ECR, LH, collisional heating
52.35.Bj Magnetohydrodynamic waves (e.g., Alfven waves)
52.50.Gj Plasma heating by particle beams
52.55.Pi Fusion products effects (e.g., alpha-particles, etc.), fast particle effects
Issue 3 (March 2008)
Received 17 October 2007, in final form 8 January 2008
Published 7 February 2008
M A Van Zeeland et al 2008 Plasma Phys. Control. Fusion 50 035009
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