T{sub e}(R,t) measurements using electron Bernstein wave thermal emission on NSTX

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2235112· OSTI ID:20861285

Diem, S J; Taylor, G; Efthimion, P C; LeBlanc, B P; Carter, M; Caughman, J; Wilgen, J B; Harvey, R W; Preinhaelter, J; Urban, J ^[1]

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1. Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)

The National Spherical Torus Experiment (NSTX) routinely studies overdense plasmas with n{sub e} of (1-5)x10{sup 19} m{sup -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 T{sub e} 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.

• OSTI ID: 20861285
• Journal Information: Review of Scientific Instruments, Vol. 77, Issue 10; Other Information: DOI: 10.1063/1.2235112; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANTENNAS
BERNSTEIN MODE
CYCLOTRON HARMONICS
ELECTRON TEMPERATURE
ELECTRONS
EMISSION
GHZ RANGE 01-100
ION TEMPERATURE
MAGNETIC FIELDS
MODE CONVERSION
NSTX DEVICE
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA WAVES
POLARIZATION
RADIOMETERS
SPHERICAL CONFIGURATION