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Te(R,t) measurements using electron Bernstein wave thermal emission on NSTX

Rev. Sci. Instrum. 77, 10E919 (2006); doi:10.1063/1.2235112

Published 11 October 2006

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S. J. Diem, G. Taylor, P. C. Efthimion, and B. P. LeBlanc
Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543

M. Carter, J. Caughman, and J. B. Wilgen
Oak Ridge National Laboratory, Fusion Energy Division, P.O. Box 2008, Oak Ridge, Tennessee 37831-6169

R. W. Harvey
CompX, Del Mar, California 92014

J. Preinhaelter and J. Urban
Czech Institute of Plasma Physics, Za Slovankou 3, 18200 Prague 8, Prague, Czech Republic
The National Spherical Torus Experiment (NSTX) routinely studies overdense plasmas with ne of (1–5)×1019  m–3 and total magnetic field of <0.6  T, so that the first several electron cyclotron harmonics are overdense. The electrostatic electron Bernstein wave (EBW) can propagate in overdense plasmas, exhibits strong absorption, and is thermally emitted at electron cyclotron harmonics. These properties allow thermal EBW emission to be used for local Te measurement. A significant upgrade to the previous NSTX EBW emission diagnostic to measure thermal EBW emission via the oblique B-X-O mode conversion process has been completed. The new EBW diagnostic consists of two remotely steerable, quad-ridged horn antennas, each of which is coupled to a dual channel radiometer. Fundamental (8–18  GHz) and second and third harmonic (18–40  GHz) thermal EBW emission and polarization measurements can be obtained simultaneously. ©2006 American Institute of Physics
History: Presented 9 May 2006; received 6 May 2006; accepted 27 June 2006; published 11 October 2006
Permalink: http://link.aip.org/link/?RSINAK/77/10E919/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.70.Gw
    Radio-frequency and microwave plasma diagnostic measurements
  • 52.25.Os
    Emission, absorption, and scattering of electromagnetic radiation from plasmas
  • 52.35.Fp
    Plasma electrostatic waves and oscillations e.g., ion-acoustic waves
  • 52.55.Fa
    Tokamaks
  • 52.40.Fd
    Plasma interactions with antennas; plasma-filled waveguides
  • YEAR: 2006

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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