Te (R,t) Measurements using Electron Bernstein Wave Thermal Emission on NSTX

Technical Report · Fri Jun 09 00:00:00 EDT 2006

DOI:https://doi.org/10.2172/963548· OSTI ID:963548

Diem, S J; Efthimion, P C; LeBlanc, B P; Carter, M; Caughman, J; Wilgen, J B; Harvey, R W; Preinhaelter, J

The National Spherical Torus Experiment (NSTX) routinely studies overdense plasmas with ne of (1–5) X 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.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-ACO2-76CHO3073
• OSTI ID: 963548
• Report Number(s): PPPL-4244; TRN: US0903632
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
ANTENNAS
CYCLOTRON HARMONICS
ELECTRONS
ELECTROSTATICS
HARMONICS
MAGNETIC FIELDS
MODE CONVERSION
POLARIZATION
NSTX