Neutral Beam Heating Of Reversed Field Pinch Plasmas In MST

POSTER

Abstract

Thomson scattering measurements detect statistically significant heating of electrons due to neutral beam injection (NBI) in enhanced confinement plasmas in the MST. Heating is observed to be approximately 100$\pm 50$eV in the core of 200 kA plasmas with a line-averaged electron density of ~0.5 x 10$^{13}$ cm$^{-3}$. This is the first definitive measurement of auxiliary (non-Ohmic) heating of an RFP. This heating is consistent with a 1-D classical model that calculates changes in thermal conductivity and Ohmic input power profiles during enhanced confinement (PPCD), and can calculate NBI deposition and classical fast ion diffusion and slowing down. The model is consistent with measured beam heating both during enhanced confinement and after. This is consistent with previous research, which found that fast ions were well-confined on MST and dominated by classical dynamics. Work supported by the USDOE

Authors

  • J. Waksman

    University of Wisconsin-Madison

  • J.K. Anderson

    UW - Madison and CMSO, University of Wisconsin- Madison, University of Wisconsin Madison, University of Wisconsin-Madison, UW Madison, University of Wisconsin, University of Wisconsin, Madison, WI

  • M. Nornberg

    UW-Madison, University of Wisconsin-Madison, UW Madison, University of Wisconsin, Madison, WI

  • D. Liu

    UC Irvine, Univ. of California, Irvine, University of California-Irvine

  • G. Fiksel

    University of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, Univ. Rochester

  • H. Sakakita

    National Institute of Advanced Industrial Science and Technology

  • V.I. Davydenko

    Institute of Nuclear Physics, Novosibirsk, Russia

  • A.A. Ivanov

    Institute of Nuclear Physics, Novosibirsk, Russia

  • N. Stupishin

    Institute of Nuclear Physics, Novosibirsk, Russia