Experimental Studies of ICRF Mode Conversion with Phase Contrast Imaging and Comparison with Full-wave Simulations

POSTER

Abstract

Mode conversion of fast wave to ion Bernstein wave and ion cyclotron wave has been observed with the phase contrast imaging diagnostic (PCI) in D(-$^3$He) plasmas in Alcator C-Mod [1, 2]. The wave electric fields are simulated for the experimentally measured equilibrium profiles using the full- wave codes TORIC [3] and AORSA [4]. Although the predictions of the two codes agree, the simulated PCI signals are larger than the measurements by at least a factor of 10. This could be partially explained by edge losses, which are not accounted for in the simulations, but is not fully understood. Predictions of direct rf flow drive for this scenario will also be presented. \\[4pt] [1] E. Nelson-Melby, et al., Phys. Rev. Lett. 90, 155004 (2003).\\[0pt] [2] Y. Lin, et al., Phys. Rev. Lett. 101, 235002 (2008).\\[0pt] [3] M. Brambilla, Plasma Phys. Control, Fusion 41, 1 (1999).\\[0pt] [4] E. F. Jaeger, et al., Phys. Plasmas 8, 1573 (2001).

Authors

  • N. Tsujii

    MIT Plasma Science and Fusion Center

  • M. Porkolab

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, MIT Plasma Science and Fusion Center, MIT-PSFC, MIT PSFC, PSFC, Massachusetts Institute of Technology

  • E.M. Edlund

    MIT Plasma Science and Fusion Center

  • Liang Lin

    MIT Plasma Science and Fusion Center, MIT/UCLA

  • Yijun Lin

    MIT PSFC, MIT Plasma Science and Fusion Center

  • S.J. Wukitch

    MIT PSFC, MIT Plasma Science and Fusion Center

  • P.T. Bonoli

    Massachusetts Institute of Technology, MIT, MIT Plasma Science and Fusion Center, PSFC-MIT, MIT-PSFC

  • J. Wright

    MIT, PSFC-MIT, MIT Plasma Science and Fusion Center, MIT-PSFC

  • E.F. Jaeger

    Oak Ridge National Laboratory, ORNL