#45
Summary of Runaway Electrons activities during the last year of the COMPASS operation
Oral
Eva Macusova (Institute of Plasma Physics of Czech Academy of Sciences)
E. Macusova1,2, O. Ficker1,2, J. Cerovsky1,2, J. Caloud1,2, W. Bin3, O. Bogar1, P. Buratti3, C. Castaldo4, A.
Dal Molin4, F. Napoli4, G. Ghillardi4, M. Jerab1, S. Kulkov2, M. Marcisovsky2, J. Adamek1, P. Bohm1, P.
Bilkova1, J. Cavalier1, A. Casolari1, A Cardinali4, D. Carnevale5, M. Farnik1,2, A. Havranek1, M. Gobbin6,
M. Hron1, K. Kovarik1, J. Mlynar1,2, T. Markovic1,7, D. Naydenkova1, M. Nocente5, R. Panek1, E. Perelli
Cippo3, M. Tomes1,7, J. Seidl1, D. Rigamonti4, A. Selce6, M. Sos1, M. Tardocchi4, M. Varavin1, P.
Vondracek1, V. Weinzettl1, J. Zajac1, the COMPASS team# & the EUROfusion MST1 team ∗
Abstract
Two dedicated Runaway Electrons (RE) campaigns were held during the last year of the COMPASS
tokamak operation (2020). COMPASS was a compact size machine with ITER-like plasma cross-section, active RE radial feedback, and loop voltage control. Quiescent reproducible flattop RE
scenarios allowed to study the effect of various mitigation strategies and control techniques on RE
dynamics and the termination phase.
A brief overview of the set of RE relevant diagnostics (HXR spectrometer, synchrotron radiation
detector, and set of loop antennas) were prepared and utilized within the international collaboration
for the last two RE campaigns. The observations of kinetic instabilities and their interplay with RE as
well as the effect of resonant magnetic perturbations on the level of RE losses will be described in
great detail. Newly observed unexplained features will be presented as possible topics for
discussions.