Ion temperature measurements in the tokamak scrape-off layer with high temporal resolution
| Authors | |
|---|---|
| Year of publication | 2021 |
| Type | Article in Periodical |
| Magazine / Source | Nuclear Fusion |
| MU Faculty or unit | |
| 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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