Optical signature of RF arcs in the ICRH frequency range
| Autor: | G. Siegl, T. Huijser, S. Huygen, Helmut Faugel, R. D'Inca, M. Vervier, A. Onyshchenko, D. Hangan, Pierre Dumortier, A. Messiaen, N. C. J. van der Valk |
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| Rok vydání: | 2011 |
| Předmět: |
Risetimes
Materials science Optical signatures Photodetector Arc detection ICRF antennas Test benches Optoelectronic devices Stainless steel Arc (geometry) Optics Physics & Electronics Band-pass filter General Materials Science Dedicated measurements Gas pressures Emission spectrum Fusion machines ICRF system Civil and Structural Engineering Light intensity OPT - Optics TS - Technical Sciences Time evolutions Spectral signature ICRF Spectrometer business.industry Physics Mechanical Engineering Time-resolved intensity RF breakdown Bandpass filters High-speed Emission spectroscopy ICRH Emission spectrums Safety issues Steel components Nuclear Energy and Engineering Rise time Optical characterization business Pressure conditions Frequency ranges Optical arc detection |
| Zdroj: | Fusion Engineering and Design, 6-8, 86, 831-834 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2011.02.080 |
| Popis: | RF arc detection is a key operational and safety issue for ICRF systems. Dedicated measurements on a RF test-stand were made in order to characterize the optical signature of RF arcs (time and spectrum) to assess the potential of optical arc detection on ICRF systems. Time-resolved intensity measurements were carried out using high-speed Si photodetectors with different bandpass filters. The rise time of the arc emission, the light intensity and the time evolution of the arc under different pressure conditions are discussed. Spectral signature of the arcs was obtained using spectrometers in the visible and UV range. It is shown that the arc emission spectrum is independent of the gas pressure and that it is mainly dominated by the stainless steel components of the test bench. The results of the RF arc optical characterization is discussed with a view on the implementation of an optical arc detection system for an ICRF antenna on a fusion machine, both for sections viewing the plasma light as for private vacuum sections. © 2011 Pierre Dumortier Published by Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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