Radiometry for the vertical electron cyclotron emission from the runaway electrons at the COMPASS tokamak

0519305 - ÚFP 2020 RIV US eng J - Journal Article
Farník, Michal - Urban, Jakub - Zajac, Jaromír - Bogár, Ondrej - Varavin, Mykyta - Casolari, Andrea - Čeřovský, Jaroslav - Ficker, Ondřej - Mlynář, Jan - Tomešová, Eva - Weinzettl, Vladimír - Hron, Martin
Radiometry for the vertical electron cyclotron emission from the runaway electrons at the COMPASS tokamak.
Review of Scientific Instruments. Roč. 90, č. 11 (2019), č. článku 113501. ISSN 0034-6748. E-ISSN 1089-7623
R&D Projects: GA MŠMT(CZ) 8D15001
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : COMPASS * tokamak * runaway electrons
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 1.480, year: 2019
Method of publishing: Limited access
https://aip.scitation.org/doi/10.1063/1.5099463

Due to an increased interest in runaway electron (RE) phenomena in tokamak research, the need for diagnostics of runaway electron population in plasma has emerged. A novel diagnostic of the nonthermal electron cyclotron emission from runaway electrons can be utilized for this purpose. It was designed and installed at the COMPASS tokamak based on the available heterodyne radiometer. The vertical ECE (V-ECE) system uses a 16-channel heterodyne radiometer with a vertically placed E2-band horn antenna with a 76.5-90 GHz frequency range front-end. Simulations with the ray-tracing SPECE code have shown a measurement feasibility of the runaway electrons with energies up to 1 MeV. Due to a low optical depth of the plasma in COMPASS during RE discharges, reflected waves from the tokamak wall can be detected as well. First results show strong connection with other RE diagnostics at COMPASS. The V-ECE can obtain important information about RE population evolution and primary generation mechanism.
Permanent Link: http://hdl.handle.net/11104/0304307