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Home / Publications / Journals / Fusion Science and Technology / Volume 50 / Number 2

Up-Down and In-Out Asymmetry Monitoring Based on Broadband Radiation Detectors

M. A. Ochando, F. Medina, B. Zurro, A. Baciero, K. J. McCarthy, M. A. Pedrosa, C. Hidalgo, E. Sánchez, J. Vega, A. B. Portas, L. M. Martínez-Fresno, HIBP Group, ECRH Group, NBI Group, TJ-II Team

Fusion Science and Technology / Volume 50 / Number 2 / August 2006 / Pages 313-319

Technical Paper / Stellarators /

Understanding the origin of asymmetries, either in plasma flows reaching the divertor region or in plasma emissivity from the confined volume, is a question of great interest in magnetic confined plasma research.

In the TJ-II stellarator, a set of bolometer systems distributed around the vacuum chamber has been installed to monitor up-down and in-out radiation asymmetries that are observed in transitions to different confinement regimes. Although plasma emissivity is a complex magnitude, a comparison of signals from twin detectors placed at selected positions may be of help to distinguish between the different causes of asymmetry. Moreover, this is a nonperturbing method that is especially appropriate when plasma wall clearance is small.

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