Open AccessModeling of Lyman-α line polarization in fusion plasma due to anisotropic electron collisions
Author(s) -
M. Goto,
N. Ramaiya
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1289/1/012011
Subject(s) - plasma , anisotropy , polarization (electrochemistry) , electron , physics , atomic physics , magnetic field , electron density , population , perpendicular , electron temperature , condensed matter physics , chemistry , optics , quantum mechanics , geometry , demography , mathematics , sociology
We have derived a formula for calculating the polarization state of the Lyman- α line in plasma caused by anisotropy in the electron velocity distribution function. Calculation results under the condition of the magnetically confined fusion plasma show that the longitudinal alignment of 0.01 is caused by approximately 10%–20% difference in the electron temperature in the directions parallel and perpendicular to the magnetic field. It is also found that the polarization decreases with the increasing electron density, n e , due to the collisional population averaging effect over the magnetic sublevels in the range of n e > 10 18 m −3 and is virtually extinguished at n e = 10 21 m −3 .