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

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