Assessment Of An Oblique ECE Diagnostic For ITER

Gary Taylor and Robert W. Harvey

关键词: ANTENNAS;    CYCLOTRONS;    DESIGN;    DISTRIBUTION;    ELECTRON TEMPERATURE;    ELECTRONS;    LASERS;    PHYSICS;    PLASMA;    REFRACTION;    RESOLUTION;    THOMSON SCATTERING ITER;   

DOI  :  10.2172/958412
RP-ID  :  PPPL-4332
PID  :  OSTI ID: 958412
Others  :  TRN: US1000026

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

A systematic disagreement between the electron temperature measured by electron cyclotron emission (TECE) and laser Thomson scattering (TTS), that increases with TECE, is observed in JET and TFTR plasmas, such that TECE ~ 1.2 TTS when TECE ~ 10 keV. The disagreement is consistent with a non-Maxwellian distortion in the bulk electron momentum distribution. ITER is projected to operate with Te(0) ~ 20-40 keV so the disagreement between TECE and TTS could be > 50%, with significant physics implications. The GENRAY ray tracing code predicts that a two-view ECE system, with perpendicular and moderately oblique viewing antennas, would be sufficient to reconstruct a two-temperature bulk distribution. If the electron momentum distribution remains Maxwellian the moderately oblique view could still be used to measure Te(R). A viewing dump will not be required for the oblique view and plasma refraction will be minimal. The oblique view has a similar radial resolution to the perpendicular view, but with some reduction in radial coverage. Oblique viewing angles of up to 20o can be implemented without a major revision to the front end of the existing ITER ECE diagnostic design.