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This article is cited in 7 scientific papers (total in 7 papers)
Electron temperature distribution measurements in clouds of polystyrene pellets ablating in LHD heliotron plasma
I. A. Sharova, V. Yu. Sergeeva, I. V. Miroshnikovb, B. V. Kuteevc, N. Tamurad, S. Sudoe a Peter the Great St. Petersburg Polytechnic University
b Ioffe Institute, St. Petersburg
c National Research Centre "Kurchatov Institute", Moscow
d National Institute for Fusion Science, Toki City, GIFU Prefecture, Japan
e Chubu University, Kasugai, Aichi, Japan
Abstract:
Two methods for measuring the spatial distribution of the temperature of electrons in a cloud near a polystyrene pellet that ablates in LHD heliotron plasma are described. The first method is based on measuring the ratio of the local emission-coefficient values at wavelengths of 486 $\pm$ 5 nm (the H$_\beta$ line) and 630 $\pm$ 5 nm (continuum). The second (new) method is based on the measurement of radiation distributions of the H$_\beta$ line in the direction along the magnetic field. Both the methods use an assumption about the partial local thermodynamic equilibrium in the cloud and show close results. It is shown for the first time that the temperature of cloud electrons increases from 0.8 eV in the immediate vicinity of the pellet surface to 6.0–7.0 eV at a distance of 6–8 mm from the pellet in the direction along the magnetic field, which agrees with the experimentally observed longitudinal distribution of the H$_\beta$ radiation in the cloud.
Received: 10.01.2018
Citation:
I. A. Sharov, V. Yu. Sergeev, I. V. Miroshnikov, B. V. Kuteev, N. Tamura, S. Sudo, “Electron temperature distribution measurements in clouds of polystyrene pellets ablating in LHD heliotron plasma”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 44:9 (2018), 41–48; Tech. Phys. Lett., 44:5 (2018), 384–387
Linking options:
https://www.mathnet.ru/eng/pjtf5817 https://www.mathnet.ru/eng/pjtf/v44/i9/p41
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