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

Yuki Hayashi (Corresponding author), Hirohiko Tanaka, Noriyasu Ohno, Shin Kajita, Thomas Morgan, Hennie van der Meiden, John Scholten, Jordy Vernimmen, Hiroki Natsume, Keiji Sawada, Shota Masuda

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Article number105013
Number of pages11
JournalPlasma Physics and Controlled Fusion
Volume64
Issue number10
DOIs
Publication statusPublished - Oct 2022
Externally publishedYes

Bibliographical note

Funding Information:
We greatly appreciate the Magnum-PSI team for their technical support with the experiments. This work was supported by JSPS KAKENHI Grant Numbers JP17KK0132, JP18KK0410, JP19K14686, JP20H00138, JP21KK0048, and JP22H01203 and NIFS/NINS under the Young Researchers Supporting Program. The Magnum-PSI facility at DIFFER was funded by the Netherlands Organization for Scientific Research (NWO) and EURATOM. DIFFER is part of the institute’s organization of NWO and a partner in the Trilateral Euregio Cluster TEC.

Keywords

  • Langmuir probe
  • Magnum-PSI
  • plasma detachment
  • pulse plasma
  • recycling

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