Ion temperature measurements in the tokamak scrape-off layer with high temporal resolution

0555703 - ÚFP 2022 RIV AT eng J - Journal Article
Adámek, Jiří - Cipciar, A. - Devitre, A. - Horáček, Jan - Cavalier, Jordan - Komm, Michael - Krbec, Jaroslav - Tichý, M. - Trunec, D. - Böhm, Petr - Pánek, Radomír
Ion temperature measurements in the tokamak scrape-off layer with high temporal resolution.
Nuclear Fusion. Roč. 61, č. 3 (2021), č. článku 036023. ISSN 0029-5515. E-ISSN 1741-4326
R&D Projects: GA MŠMT(CZ) EF16_019/0000768; GA ČR(CZ) GA20-28161S; GA ČR GA19-00579S
Institutional support: RVO:61389021
Keywords : ion temperature * L-mode * magnetic-confinement fusion * plasma
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 4.215, year: 2021
Method of publishing: Limited access
https://iopscience.iop.org/article/10.1088/1741-4326/abd41d

We present a uniquely fast (10 μs) ion temperature measurements in the tokamak edge plasma. Our approach is based on the sweeping of a ball-pen probe, where the ion temperature is obtained by fitting the electron branch of the corresponding I-V characteristic. We have performed measurements on the COMPASS tokamak during L-mode discharge. The temperature histograms reveal a non-Gaussian shape with a high-temperature tail peaking at low values. The fitted values of fast I-V measurements can be used to reconstruct (emulate) the slow swept I-V characteristic of a retarding field analyzer. The resulting ion temperature profile is nearly flat and provides a ratio of ion to electron temperature close to 1-2 in the vicinity of the last closed flux surface during L-mode discharges, as observed on other tokamaks.
Permanent Link: http://hdl.handle.net/11104/0330167