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newbonoli_sherwood_2017_poster_v1.pdf2018-01-21 09:59:55Paul Bonoli

Abstracts

Author: Paul T. Bonoli
Requested Type: Poster
Submitted: 2017-03-17 13:19:13

Co-authors: J. P. Lee, J. C. Wright, S. Shiraiwa, B. Ding, C. Yang

Contact Info:
Massachusetts Institute of Technology
167 Albany Street, Room 240
Cambridge, MA   02139
USA

Abstract Text:
Coupled full-wave / Fokker Planck simulations of lower hybrid wave propagation and absorption in the EAST tokamak*
P. T. Bonoli, J. P. Lee, J. C. Wright, and S. Shiraiwa, MIT-PSFC, Cambridge, MA 02139 and B. Ding, C. Yang, CAS-IPP, Hefei, China
Studies of lower hybrid (LH) wave propagation have been conducted in the EAST tokamak where electron Landau damping (ELD) of the wave is typically weak, resulting in multiple passes of the wave front prior to its being absorbed. Under these conditions full-wave effects can become important at the wave cut-off at the plasma edge, as well as at caustic surfaces in the core. High fidelity LH full-wave simulations have been performed for EAST using the TorLH field solver [1] coupled with the CQL3D Fokker Planck code [3]. These simulations used sufficient poloidal mode resolution to resolve the perpendicular wavelengths associated with electron Landau damping of the LH wave at the plasma periphery, thus achieving fully converged electric field solutions at all radii of the plasma. Coupling between the full-wave and Fokker Planck calculations is achieved through a quasilinear RF diffusion coefficient evaluated using the Kennel-Engelmann form [4]. The full-wave and Fokker Planck calculations are iterated until a converged nonthermal electron distribution is obtained. Results will be presented demonstrating the effect of electron temperature on the rate of solution convergence with poloidal mode number.
[1] J. C. Wright et al, Physics of Plasmas 16, 072502 (2009).
[2] C. Yang et al, Plasma Physics and Controlled Fusion 56 125003 (2014).
[3] R. W. Harvey and M. G. McCoy, “The CQL3D Fokker-Planck Code”, in Proceedings of the IAEA Technical Committee Meeting on Advances in Simulation and Modeling of Thermonuclear Plasmas, Montreal, 1992, p. 527, IAEA, Vienna (1993).
[4] C. F. Kennel and F. Engelmann, The Physics of Fluids 9, 2377 (1966).
*Work supported by the US DOE under Contract No. DE-SC0010492 and DE-FC02-01ER54648.

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