Soledge2D-Eirene simulations of the Pilot-PSI linear plasma device compared to experimental data

K. Jesko, Y. Marandet, H. Bufferand, J.P. Gunn, H.J. van der Meiden, G. Ciraolo

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

Predictions for the operation of tokamak divertors are reliant on edge plasma simulations typically utilizing a fluid plasma code in combination with a Monte Carlo code for neutral species. Pilot-PSI is a linear device operating with a cascaded arc plasma source that produces plasmas comparable to those expected in the ITER divertor (Te∼1eV, ne∼1021 m-3). In this study, plasma discharges in Pilot-PSI are modelled using the Soledge2D fluid plasma code coupled to the Eirene neutral Monte Carlo code. The plasma is generated using an external source of plasma density and power. These input parameters are tuned in order to match Thomson scattering (TS) measurements close to the cascaded arc source nozzle. The sensitivity of the simulations to different atomic physics models is explored. It is found that elastic collisions between ions and hydrogen molecules have a strong influence on calculated profiles. Without their inclusion, supersonic flow regimes are obtained with M∼2 close to the target plate. Simulation results are compared with experimental findings using TS close to the target and, in the case of Pilot-PSI, a Langmuir probe embedded in the target. Comparison between experimental trends observed in a background pressure scan and the simulations show that the inclusion of the elastic collision is mandatory for the trends to be reproduced.

Original languageEnglish
Pages (from-to)798-804
Number of pages7
JournalContributions to Plasma Physics
Volume58
Issue number6-8
DOIs
Publication statusPublished - 1 Jul 2018
Event16th International Workshop on Plasma Edge Theory in Fusion Devices - Marseill, France
Duration: 27 Sep 201729 Sep 2017

Keywords

  • Detachment
  • Divertor
  • Linear plasma device
  • Soledge2D-Eirene
  • detachment
  • linear plasma device
  • divertor

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