authors
- HAPPEL, T.
- ESTRADA, T.
- BLANCO, E.
- TRIBALDOS MACIA, VICTOR
- CAPPA, A.
- BUSTOS, A.
Doppler Reflectometer System in the Stellarator TJ-II
Articles
Overview
published in
- REVIEW OF SCIENTIFIC INSTRUMENTS Journal
publication date
- July 2009
start page
- 73502
issue
- 7
volume
- 80
Digital Object Identifier (DOI)
International Standard Serial Number (ISSN)
- 0034-6748
Electronic International Standard Serial Number (EISSN)
- 1089-7623
abstract
- A Doppler reflectometer system has recently been installed in the stellarator TJ-II. The system is optimized for the Q-band (33&-50 GHz) and the high-curvature plasmas produced in TJ-II. The launch angle of the microwave beam can be controlled by a steerable mirror to obtain angles between ±20° enabling the measurement of perpendicular wave numbers in the range of 3&-15 cm−1. The available angular range allows for comparisons between positive and negative values and additionally for calibration of the system. Localization and k⊥-estimation is done via the three-dimensional ray/beam-tracing code TRUBA. First measured spectra and radial profiles of the perpendicular velocity of plasma density fluctuations are presented.