Characterization of Electron Bernstein Wave Emission from the TJ-II Stellarator

Journal Article · Thu Nov 26 00:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3273792· OSTI ID:21335768

Caughman, J B. O.; Rasmussen, D A; Wilgen, J B ^[1]; Cappa, A; Garcia-Regana, J M; Castejon, F; Fernandez, A ^[2]

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1. Oak Ridge National Laboratory, Oak Ridge, TN (United States)
2. Laboratory National de Fusion, EUROTOM-CIEMAT, Madrid (Spain)

Thermal electron emission at 28 GHz has been measured on the TJ-II Stellarator. The microwave emission from over-dense neutral beam heated plasmas, where the plasma density is greater than the ordinary-mode (O-mode) cutoff density (>1.2x10{sup 19} m{sup -3}), is consistent with electron thermal emission from mode-converted electron Bernstein waves (EBW) via the Bernstein wave to extraordinary mode to ordinary mode scenario (B-X-O). Electron Bernstein wave emission (EBE) measurements are being made to determine the optimum launch angle for planned EBW heating experiments and also to provide an indication of electron temperature evolution in over-dense plasma. A movable focusing mirror located inside the vacuum vessel is used to measure the emission as a function of viewing angle, and measurements are compared with ray-tracing calculations using the TRUBAcode.

• OSTI ID: 21335768
• Journal Information: AIP Conference Proceedings, Vol. 1187, Issue 1; Conference: 18. topical conference on radio frequency power in plasmas, Gent (Belgium), 24-26 Jun 2009; Other Information: DOI: 10.1063/1.3273792; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION HEATING
BERNSTEIN MODE
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
ELECTRON EMISSION
ELECTRON TEMPERATURE
ELECTRONS
GHZ RANGE
MICROWAVE RADIATION
MIRRORS
NEUTRAL ATOM BEAM INJECTION
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA SIMULATION
PLASMA WAVES
T CODES
TJ-II HELIAC