Measurement of Plasma Displacement Due to Resonant Field Amplification in High Beta DIII-D Plasmas Using CER Spectroscopy

POSTER

Abstract

In a plasma with beta above the no-wall limit, externally applied magnetic perturbations can couple to the rotationally stabilized RWM via resonant field amplification [1]. This phenomenon is routinely exploited in the technique of active MHD spectroscopy to test the stability of the RWM [2]. We utilize measurements of the ion temperature from charge exchange recombination spectroscopy at two toroidal locations during MHD spectroscopy experiments to obtain a direct measurement of the $n=1$ plasma fluid displacement due to the RFA. The displacement profiles are compared with those expected for the stabilized RWM. \par\vskip6pt\noindent [1] A.M. Garofalo, et al., Phys. Plasmas 10, 4776 (2003).\par\noindent [2] H. Reimerdes, et al., Phys. Rev. Lett. 93, 135002 (2004).

*Supported by the US DOE under DE-FG02-89ER53297, DE-AC02-76CH03072, DE-FC02-04ER54698, and DE-FG02-03ER83657, and the Fusion Energy Science Fellowship.

Authors

  • M.J. Lanctot

  • A.M. Garofalo

    • Columbia U.

  • H. Reimerdes

    • Columbia U.

  • Gerald A. Navratil

    • Columbia U.
    • Columbia University

  • M. Okabayashi

    • PPPL

  • W.M. Solomon

    • PPPL

  • G.L. Jackson

  • R.J. La Haye

    • GA

  • E.J. Strait

    • General Atomics
    • GA

  • Y. In

    • FAR-TECH, Inc.