Studies of runaway electrons via Cherenkov effect in tokamaks

J. Zebrowski, L. Jakubowski, M. Rabinski, M.J. Sadowski, M.J. Jakubowski, R. Kwiatkowski, K. Malinowski, R. Mirowski, J. Mlynar, O. Ficker, V. Weinzettl, F. Causa

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Abstract

The paper concerns measurements of runaway electrons (REs) which are generated during discharges in tokamaks. The control of REs is an important task in experimental studies within the ITER-physics program. The NCBJ team proposed to study REs by means of Cherenkov-type detectors several years ago. The Cherenkov radiation, induced by REs in appropriate radiators, makes it possible to identify fast electron beams and to determine their spatial- and temporal-characteristics. The results of recent experimental studies of REs, performed in two tokamaks - COMPASS in Prague and FTU in Frascati, are summarized and discussed in this paper. Examples of the electron-induced signals, as recorded at different experimental conditions and scenarios, are presented. Measurements performed with a three-channel Cherenkov-probe in COMPASS showed that the first fast electron peaks can be observed already during the current ramp-up phase. A strong dependence of RE-signals on the radial position of the Cherenkov probe was observed. The most distinct electron peaks were recorded during the plasma disruption. The Cherenkov signals confirmed the appearance of post-disruptive RE beams in circular-plasma discharges with massive Ar-puffing. During experiments at FTU a clear correlation between the Cherenkov detector signals and the rotation of magnetic islands was identified.
Original languageEnglish
DOIs
Publication statusPublished - 7 Feb 2018
Externally publishedYes
Event2017 International Conferences on Research and Applications of Plasmas, PLASMA 2017 - Warsaw, Poland
Duration: 7 Feb 2018 → …

Conference

Conference2017 International Conferences on Research and Applications of Plasmas, PLASMA 2017
CountryPoland
CityWarsaw
Period7/2/18 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zebrowski, J., Jakubowski, L., Rabinski, M., Sadowski, M. J., Jakubowski, M. J., Kwiatkowski, R., Malinowski, K., Mirowski, R., Mlynar, J., Ficker, O., Weinzettl, V., & Causa, F. (2018). Studies of runaway electrons via Cherenkov effect in tokamaks. Paper presented at 2017 International Conferences on Research and Applications of Plasmas, PLASMA 2017, Warsaw, Poland. https://doi.org/10.1088/1742-6596/959/1/012002