SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.28: Poster

Mittwoch, 22. März 2023, 17:30–19:00, HSZ EG

Measurement and Modeling of radiation losses in the stellarator TJ-K — •Izel Gediz and Alf Köhn-Seemann — IGVP, University of Stuttgart, Germany

In the stellarator TJ-K cold plasmas of up to 20 eV are routinely produced. An 8-channel gold-foil bolometer is used to observe the radiation emitted by the plasma. Following the principle of a "camera obscura" the 8 channels observe the plasma through a small slit, allowing for reconstruction of the spatial profile of the emitted radiation. In this manner line integrated power profiles can be recorded, giving information about the absolute numbers of radiated power as well as the relative spatial distribution of the radiation. This diagnostic was recently reestablished and newly calibrated to aid parameter studies, including plasma density and temperature measurements. Line radiation is the major contributor to the radiation losses of typical plasmas in TJ-K. Information about the absolute loss term due to radiation will give further insights in the efficiency of confined plasmas as well as increase the accuracy with which other loss-terms (e.g. diffusion terms) in energy- and particle-balance equations can be estimated. Furthermore the spatial radiation profiles can reveal interesting parameter regimes where e.g. fast electrons in the plasmas edge regions could be observed. The radiation profiles are also being calculated and compared with the measurements, enabling adjustments of the model used to estimate the radiative loss term so far.