2024-03-28T12:17:54Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00028647
2023-01-16T04:45:46Z
673:674:675
Effect of cross-field transport on H^− density profile in magnetized plasmas: Comparison between measurement and simulation
Kajita, Shin
94047
Kado, Shinichiro
94048
Ohno, Noriyasu
94049
Takamura, Shuichi
94050
Kurihara, Kiminori
94051
Kuwahara, Yosuke
94052
The radial density profile of negative hydrogen ions in magnetized plasma is investigated in the divertor simulator MAP (Material and plasma)-II [S. Kado et al., J. Plasma Fusion Res. 71, 810 (2005)] by measurement and numerical simulation. The laser photodetachment method is used to evaluate the H^− density by considering the influence of the magnetic field. The density of H^− has a hollow profile and exhibits a peak in the peripheral region, though the electron density and temperature exhibit a peak at the center of the plasma column. The density profile of H− does not agree with the calculation result obtained from the rate equation, in which the local production and extinction rates are balanced, under the present experimental condition. To understand the behavior of negative ions, their trajectories are calculated by numerically solving the equation of motion by considering the effect of collisions. The negative ion density profile calculated from the particle simulation agrees well with the measured negative ion density profile. It is shown that the cross-field H− transport due to the radial electric field with the assistance of the elastic collisions plays an important role in enhancing the negative ion density in the peripheral region.
journal article
AIP Publishing
2007-10
application/pdf
Physics of Plasmas
10
14
103503
1070-664X
https://nagoya.repo.nii.ac.jp/record/28647/files/1_2789559.pdf
eng
https://doi.org/10.1063/1.2789559
Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Physics of Plasmas. v.14, n.10, 2007, p.103503) and may be found at (http://dx.doi.org/10.1063/1.2789559).