Open AccessИзмерение пространственных распределений температуры электронов в облаках полистироловых пеллетов, испаряющихся в плазме гелиотрона LHD
Author(s) -
И.А. Шаров,
В.Ю. Сергеев,
И.В. Мирошников,
Б.В. Кутеев,
N. Tamura,
S. Sudo
Publication year - 2018
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2018.09.46064.17203
Subject(s) - plasma , large helical device , electron , radiation , atomic physics , magnetic field , wavelength , pellet , electron temperature , physics , computational physics , materials science , optics , nuclear physics , quantum mechanics , composite material
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 ± 5 nm (the H _β line) and 630 ± 5 nm (continuum). The second (new) method is based on the measurement of radiation distributions of the H _β 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 _β radiation in the cloud.