Simulation of the impact of particle recycling on the plasma in MPS-LD device based on the BOUT++ LPD module

Wang, Yue; Sun, Changjiang; Sang, Chaofeng; Li, Nami; Bian, Yu; Wu, Jintao; Zhang, Mingzhou; Peng, Yao; Zhang, Yanjie; Gao, Shuaishuai; Wang, Dezhen

doi:10.1002/ctpp.202300132

Title: Simulation of the impact of particle recycling on the plasma in MPS-LD device based on the BOUT++ LPD module

Journal Article · 05 January 2024 · Contributions to Plasma Physics

DOI: https://doi.org/10.1002/ctpp.202300132 · OSTI ID:2282844

^[1]; Sun, Changjiang ^[1];

^[1];

^[2];

^[1]; Wu, Jintao ^[1];

^[1]; Peng, Yao ^[1];

^[1]; Gao, Shuaishuai ^[1]; Wang, Dezhen ^[3]

Dalian University of Technology (China)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics Dalian University of Technology Dalian China

A linear plasma device (LPD) module has been developed under the BOUT++ framework to simulate plasma transport in the MPS-LD. However, previously, the LPD module used a simplistic neutral particle model that only includes particle density and velocity, which prevents the full understanding of the plasma-neutrals interactions. In this work, we further optimize the neutral model by using a more complete neutral fluid model containing the continuity equation, momentum equation, and energy equation. The reactions such as charge exchange, excitation, and radiation collisions are included. Since the neutral particle source is mainly provided by particle recycling from the target, a particle recycling model is employed, which includes both fast reflection and slow thermal release. The upgraded LPD module is applied to simulate the argon (Ar) discharge experiment of MPS-LD, and the benchmark against experiment measurement and SOLPS-ITER simulation results are presented. Good agreements are obtained, showing the validation of the upgraded module. After that, the impact of particle recycling on Ar plasma is investigated. It is found that a higher recycling coefficient (R) promotes the achievement of high-density plasma at the target. In conclusion, the recycled Ar atoms change target plasma pressure as well as plasma-neutral collisions, which both contribute to plasma momentum loss, thus promoting the rollover of ion flux to the target.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2282844

Alternate ID(s):: OSTI ID: 2281065

Report Number(s):: LLNL--JRNL-858522; {1089087,"Journal ID: ISSN 0863-1042"}

Journal Information:: Contributions to Plasma Physics, Journal Name: Contributions to Plasma Physics Journal Issue: 7-8 Vol. 64; ISSN 0863-1042

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Simulation of the impact of particle recycling on the plasma in MPS-LD device based on the BOUT++ LPD module

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