Publication details

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

Authors

ADAMEK Jiri CIPCIAR Dario DEVITRE Alexis HORACEK Jan CAVALIER J. KOMM Michael KRBEC Jaroslav TICHY M. TRUNEC David BÖHM P. PANEK R.

Year of publication 2021
Type Article in Periodical
Magazine / Source Nuclear Fusion
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1088/1741-4326/abd41d
Doi http://dx.doi.org/10.1088/1741-4326/abd41d
Keywords plasma; magnetic-confinement fusion; L-mode; ion temperature
Description We present a uniquely fast (10 mu s) 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.
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