Up-Down and In-Out Asymmetry Monitoring Based on Broadband Radiation Detectors
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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,M. A. Ochando Laboratorio Nacional De Fusión Euratom-Ciemat Madrid Spain;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;M. A. Ochando Laboratorio Nacional De Fusión Euratom-Ciemat Madrid Spain;
fusion science and technology 2006 Vol. 50 pp. 313-319
151
spain2006fusionup-down

Abstract

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.

Keywords

detectors asymmetries plasma emissivity plasma flows divertor region plasma wall confined volume confinement regimes

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DOI:
10.13182/fst06-a1252
URL:
https://sciprofiles.com/publication/view/50c513cc6...

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ID: 270770
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