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Doppler reflectometer system in the stellarator TJ-II

2009; American Institute of Physics; Volume: 80; Issue: 7 Linguagem: Inglês

10.1063/1.3160106

1527-2400

T. Happel, T. Estrada, E. Blanco, V. Tribaldos, Á. Cappa, A. Bustos,

Superconducting Materials and Applications

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.