Abstract
The shape of soft X-ray spectra and energy confinement dynamics is studied in experiments on central ECR heating with a power to 1 MW using the L-2M stellarator. It is shown that the spectra remain two-temperature with increasing heating power. In this case, the average electron energy in the epithermal spectral region increases reaching 25% of the average energy over the entire spectrum at an ECR heating power of 950 kW. It is shown that the plasma confinement energy in the L-2M stellarator gradually decreases at heating powers above 700 kW, which is associated with an increase in the plasma radiative loss power, caused by impurity accumulation.
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This study was supported by the Russian Foundation for Basic Research, project no. 02-18-00609.
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Translated by A. Kazantsev
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Meshcheryakov, A.I., Vafin, I.Y. & Grishina, I.A. Energy Confinement Dynamics and Soft X-Ray Spectra in Experiments on ECR Plasma Heating in the L-2M Stellarator at Heating Powers to 1 MW. Bull. Lebedev Phys. Inst. 47, 10–15 (2020). https://doi.org/10.3103/S1068335620010042
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DOI: https://doi.org/10.3103/S1068335620010042