Runaway electron diagnostics for the COMPASS tokamak using EC emission

0531279 - ÚFP 2021 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Farník, Michal - Urban, Jakub - Zajac, Jaromír - Bogár, Ondrej - Ficker, Ondřej - Tomešová, Eva - Mlynář, Jan - Čeřovský, Jaroslav - Varavin, Mykyta - Weinzettl, Vladimír - Hron, Martin
Runaway electron diagnostics for the COMPASS tokamak using EC emission.
45th EPS Conference on Plasma Physics, EPS 2018. Mulhouse: European Physical Society, 2018, Roč. 45, July (2018), s. 217-220. ISBN 979-10-96389-08-7.
[45th European Physical Society Conference on Plasma Physiics. Praha (CZ), 02.07.2018-06.07.2018]
Grant CEP: GA MŠMT(CZ) LM2015045; GA MŠMT LG14002; GA MŠMT(CZ) 8D15001; GA ČR(CZ) GA18-02482S
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: runaway electrons * COMPASS * tokamak
Obor OECD: Fluids and plasma physics (including surface physics)
https://www.epj-conferences.org/articles/epjconf/pdf/2019/08/epjconf_ec2018_03006.pdf

An electron cyclotron emission (ECE) diagnostic of suprathermal electrons was utilised for runaway electron (RE) experiments purposes in the COMPASS tokamak. Our vertical ECE (V-ECE) system consists of a 16-channel heterodyne radiometer and an E-band horn antenna with a 76.5-88 GHz frequency range front-end. Simulations used for the design of the diagnostic showed a possibility of detecting the emission of low-energy (50-140 keV) runaway electrons. We realized measurements with both extraordinary (X-) and ordinary (O-) mode linear polarizations. The amplitudes of the X-mode and O-mode signals are similar, which can be explained by depolarised reflected radiation. V-ECE measurements in low-density flattop discharges and in discharges with massive gas injections of high-Z elements show correlations with other RE diagnostics. Our results are in the agreement with the principles of the primary runaway generation mechanisms.
Trvalý link: http://hdl.handle.net/11104/0309967