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Reduction of pulsed particle load with dynamic pressure induced by transient recycled neutral flux

Author
Abstract
From pulsed plasma experiments focusing on neutral pressure dependence, the impacts of a transition from a low to a high recycling target on the particle load were investigated and discussed in the linear plasma device, Magnum-PSI. Time traces of the target ion flux were mitigated in high neutral pressure cases because of a plasma-neutral interaction. On the other hand, in low neutral-pressure cases, the target ion flux indicated partial suppression in the last part of the pulse. The Langmuir probe, located 200 mm upstream from the target plate, did not exhibit such a suppression. Pulse suppression can be expected from the localized interaction between recycled neutral flux and pulsed plasma in front of the target. The mean-free paths of recycled neutral particles regarding the charge exchange with pulse ions and elastic scattering with background neutral particles were compared. Modeling using a fluid code coupled with a neutral transport code was performed, and it was concluded that dynamic pressure induced by the transient recycled neutral flux caused sufficient momentum loss to stagnate the pulsed plasma toward the target plate.
Year of Publication
2022
Journal
Plasma Physics and Controlled Fusion
Volume
64
Issue
10
Number of Pages
105013
URL
https://nifs-repository.repo.nii.ac.jp/record/11563/files/13405_Plasma_Phys._Control._Fusion.pdf
DOI
10.1088/1361-6587/ac8acb
PId
f68a65c2bbdd8a81c3a032b5764f7fad
Alternate Journal
Plasma Phys. Control. Fusion
Label
OA
Journal Article
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