The plasma–sheath transition and Bohm criterion in a high recycling divertor

Li, Yuzhi; Srinivasan, Bhuvana; Zhang, Yanzeng; Tang, Xian-Zhu

doi:10.1063/5.0147580

The plasma–sheath transition and Bohm criterion in a high recycling divertor

Journal Article · Tue Jun 06 00:00:00 EDT 2023 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0147580· OSTI ID:1993236

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Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

The high recycling regime of a divertor is characterized by high plasma particle fluxes and low temperature at the target, where a strong hydrogen recirculation loop exists. Atomic processes in the high recycling regime, such as ion–neutral friction and radiation, can affect the plasma momentum and energy transport in the sheath transition region. Here, in this work, the plasma–sheath transition near a high recycling wall is investigated. The Bohm speed, which constraints the ion exit flow speed, is evaluated from a transport model that accounts for the effect of the anisotropic transport and atomic collisions in the transition layer. A first principles kinetic code vector particle-in-cell with the atomic collision package is used to investigate a 1D self-consistent slab plasma with a high recycling boundary for the tungsten and carbon divertors. The results demonstrate the accuracy of the Bohm speed model in predicting the ion exit flow speed in the transition region, as well as the reduction of the Bohm speed due to the ion–neutral friction. The effect of different wall materials, tungsten, and carbon, on the Bohm speed and near-wall plasma profile is shown.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: 89233218CNA000001; AC02-05CH11231; SC0018276

OSTI ID:: 1993236

Alternate ID(s):: OSTI ID: 2228513

Report Number(s):: LA-UR--23-21846

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 30; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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