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

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

doi:10.1088/1361-6587/ac8acb

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 journal › Article › Academic › peer-review

3 Citations (Scopus)

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 language	English
Article number	105013
Number of pages	11
Journal	Plasma Physics and Controlled Fusion
Volume	64
Issue number	10
DOIs	https://doi.org/10.1088/1361-6587/ac8acb
Publication status	Published - Oct 2022
Externally published	Yes

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.

Funding

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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10.1088/1361-6587/ac8acb

Cite this

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title = "Reduction of pulsed particle load with dynamic pressure induced by transient recycled neutral flux",

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.",

keywords = "Langmuir probe, Magnum-PSI, plasma detachment, pulse plasma, recycling",

author = "Yuki Hayashi and Hirohiko Tanaka and Noriyasu Ohno and Shin Kajita and Thomas Morgan and \{van der Meiden\}, Hennie and John Scholten and Jordy Vernimmen and Hiroki Natsume and Keiji Sawada and Shota Masuda",

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{\textquoteright}s organization of NWO and a partner in the Trilateral Euregio Cluster TEC. ",

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doi = "10.1088/1361-6587/ac8acb",

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T1 - Reduction of pulsed particle load with dynamic pressure induced by transient recycled neutral flux

AU - Hayashi, Yuki

AU - Tanaka, Hirohiko

AU - Ohno, Noriyasu

AU - Kajita, Shin

AU - Morgan, Thomas

AU - van der Meiden, Hennie

AU - Scholten, John

AU - Vernimmen, Jordy

AU - Natsume, Hiroki

AU - Sawada, Keiji

AU - Masuda, Shota

N1 - 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.

PY - 2022/10

Y1 - 2022/10

N2 - 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.

AB - 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.

KW - Langmuir probe

KW - Magnum-PSI

KW - plasma detachment

KW - pulse plasma

KW - recycling

UR - https://www.scopus.com/pages/publications/85138162564

U2 - 10.1088/1361-6587/ac8acb

DO - 10.1088/1361-6587/ac8acb

M3 - Article

AN - SCOPUS:85138162564

SN - 0741-3335

VL - 64

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 10

M1 - 105013

ER -

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

Abstract

Bibliographical note

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Keywords

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