Neutral Particle Analyzer Vertically Scanning Measurements of MHD-induced Fast Ion Redistribution or Loss in NSTX

POSTER

Abstract

Observations of MHD-induced redistribution or loss of energetic ions measured using the vertically scanning capability of the Neutral Particle Analyzer diagnostic on the National Spherical Torus Experiment (NSTX) are presented along with TRANSP analysis. Although redistribution or loss of energetic ions due to low-f $\sim $ 10 kHz continuous kink-type MHD was reported previously [1,2], here the primary goal is to study redistribution or loss due to continuous Alfv\'{e}nic (f $\sim $ 20 -- 150 kHz) modes. Initial indications are that the former drive energetic ion loss whereas the continuous Alfv\'{e}nic modes at most only cause redistribution and the energetic ions remain confined. \newline [1] S. S. Medley\textit{, et al}., Nucl. Fusion \textbf{44}, (2004) 1158 \newline [2] J. E. Menard, \textit{et al.}, Phys. Rev. Lett. \textbf{97}, (2006) 095022

*Research supported by U.S. DOE contract DE-AC02-76-CH03073.

Authors

  • J.E. Menard

    • PPPL
    • Princeton Plasma Physics Laboratory
    • Princeton University

  • S.S. Medley

    • Princeton University

  • R. Andre

    • PPPL
    • Princeton University

  • R.E. Bell

    • Princeton University
    • Princeton Plasma Physics Laboratory
    • PPPL

  • D. Darrow

    • Princeton University
    • PPPL
    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory, Princeton, New Jersey

  • C.W. Domier

    • UC Davis

  • Eric Fredrickson

    • Princeton University
    • Princeton Plasma Physics Laboratory, Princeton, New Jersey

  • N.N. Gorelenkov

    • Princeton University
    • PPPL
    • Princeton Plasma Physics Laboratory, Princeton, New Jersey

  • Stanley Kaye

    • Princeton University
    • Princeton Plasma Physics Laboratory

  • B.P. LeBlanc

    • Princeton University
    • PPPL

  • K.C. Lee

    • Princeton University

  • Fred Levinton

    • Nova Photonics
    • Nova Photonics, Inc.

  • N.C. Luhmann, Jr.

    • UC Davis

  • D. Liu

    • UC Irvine

  • H.K. Park

    • Princeton University
    • Princeton Plasma Physics Laboratory

  • D. Stutman

    • Princeton University

  • L. Roquemore

    • PPPL
    • Princeton University

  • K. Tritz

    • Johns Hopkins University

  • Howard Yuh

    • Nova Photonics
    • Nova Photonics, Inc.
    • Nova Photonics, Inc., NJ, USA