Abstract
This article describes the study of low pressure helium plasma with magnetic confinement at the experimental test setup at the Moscow Power Engineering Institute: plasma linear multicusp (PLM). This facility is intended for testing refractory materials and prototypes of elements of the first wall within the framework of development of the national fusion reactor (DEMO–FNS) and the International Thermonuclear Experimental Reactor (ITER). The facility provides the conditions of plasma impact on the surface of tested sample close to the parameters and regime of operation of tokamak divertor plates. The facility is a magnetic trap with minimum magnetic field on the axis, where the plasma is created by the flow of electrons moving from the directly heated tantalum cathode toward the anode. It is possible to create stationary helium plasma in the facility and to maintain it for several hours under constant discharge parameters: helium pressure in the chamber of 10–3–10–1 Torr, discharge current of 4–30 A, plasma column diameter of 35–40 mm, voltage drop across the discharge gap of 100–200 V. The thermal load on the surface of target introduced into the axial region of plasma column has reached 5 MW/m2. Optical emission spectroscopy is the main diagnostic tool in this work. The procedure for determining atomic concentrations from the data on the relative intensities of atomic spectral lines of metallic impurities is proposed in this work.
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Funding
The spectroscopic study was supported by the Russian Science Foundation, grant no. 21-79-10281, “High-resolution spectroscopy for near-surface plasma diagnostics in the interaction of powerful flows of nonequilibrium magnetized plasma with a wall”; the works on plasma generation in PLM were supported by project no. 223 EOTP-UTP.
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Translated by I. Moshkin
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Kavyrshin, D.I., Budaev, V.P., Fedorovich, S.D. et al. Measuring Impurity Concentration in Near Wall Plasma During Tests of Prototypes of the First Wall of Fusion Reactor in PLM Facility. Phys. Atom. Nuclei 86, 1667–1672 (2023). https://doi.org/10.1134/S1063778823070104
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DOI: https://doi.org/10.1134/S1063778823070104