SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Poster I

P 11.28: Poster

Wednesday, March 22, 2023, 14:00–15:30, HSZ EG

Study of fast electrons population in the TJ-K stellarator. — •EdgardO Villalobos Granados and Alf Köhn-Seemann — IGVP, University of Stuttgart, Germany

Microwaves provide one of the most widely used methods for heating plasmas. If the plasma density becomes too high, the microwave is in cut-off, it cannot propagate any further and is reflected. Such plasmas are often referred to as over-dense. The stellarator TJ-K is typically operated with over-dense plasmas. Preliminary studies in TJ-K have shown that during these kinds of scenarios a component of fast electrons can be detected.

In this work, a pulse-height analyzer including a semiconductor detector being sensible in the soft X-ray range was used to measure the spectral distribution of the soft X-rays emitted by the plasma. Part of this radiation is generated by a hot electron component whose energy can be determined after calibrating the diagnostic against known X-ray sources. The occurrence of the hot electron component is studied under different discharge conditions to identify their generation mechanism.