Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI

R. Chandra, G. R.A. Akkermans, I. G.J. Classen, R. Perillo, H. J. de Blank, P. Diomede, E. Westerhof

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Sufficient decrease of plasma pressure, ion and heat flux along the scrape-off layer of a tokamak fusion reactor are imperative to ensure the survival of the divertor tiles. This specific condition, defined as detachment, occurs within low temperature, high density, highly recycling
plasma that can also be realized in linear plasma devices such as Magnum-PSI [1]. In MagnumPSI, high recycling is achieved by utilizing differential pumping across three vacuum chambers. Experiments have been conducted to mimic detachment in the Magnum-PSI linear device by
varying the neutral background pressure at the chamber of the recycling target via H2 gas puffing [2], while the hydrogen plasma source parameters are kept constant across the experiments. Numerical modelling is carried out to help gain further insights regarding the physics behind detachment. The experiments are benchmarked with a coupled fluid-kinetic approach using the B2.5- EUNOMIA code package [3]. EUNOMIA is a Monte Carlo neutral simulation optimized for linear
geometry. Thomson scattering measurements without gas puffing are used as a plasma boundary condition at the source in the simulation, and the gas pressure in the target chamber will be varied. The resulting electron density and temperature simulated profiles near the target are
compared with profiles measured in experiments. This paper presents the result of the benchmark tests, and identifies the collisional processes and other physical effects relevant to the detached plasma state
LanguageEnglish
Title of host publication45th EPS Conference on Plasma Physics, EPS 2018
EditorsJ. Berndt, S. Coda, G. Lapenta, C. Michaut, S. Weber, M. Mantsinen
Place of PublicationMulhouse
PublisherEuropean Physical Society (EPS)
Pages257-260
Number of pages4
ISBN (Electronic)9781510868441
StatePublished - 1 Jan 2018
Event45th European Physical Society Conference on Plasma Physics, (EPS 2018) - Prague, Czech Republic
Duration: 2 Jul 20186 Jul 2018
https://eps2018.eli-beams.eu/en/

Conference

Conference45th European Physical Society Conference on Plasma Physics, (EPS 2018)
Abbreviated titleEPS 2018
CountryCzech Republic
CityPrague
Period2/07/186/07/18
Internet address

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pumping
recycling
detachment
chambers
plasma pressure
fusion reactors
Thomson scattering
tiles
hydrogen plasma
vacuum chambers
profiles
gases
gas pressure
heat flux
simulation
electron energy
boundary conditions
physics
fluids
kinetics

Cite this

Chandra, R., Akkermans, G. R. A., Classen, I. G. J., Perillo, R., de Blank, H. J., Diomede, P., & Westerhof, E. (2018). Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI. In J. Berndt, S. Coda, G. Lapenta, C. Michaut, S. Weber, & M. Mantsinen (Eds.), 45th EPS Conference on Plasma Physics, EPS 2018 (pp. 257-260). Mulhouse: European Physical Society (EPS).
Chandra, R. ; Akkermans, G. R.A. ; Classen, I. G.J. ; Perillo, R. ; de Blank, H. J. ; Diomede, P. ; Westerhof, E./ Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI. 45th EPS Conference on Plasma Physics, EPS 2018. editor / J. Berndt ; S. Coda ; G. Lapenta ; C. Michaut ; S. Weber ; M. Mantsinen. Mulhouse : European Physical Society (EPS), 2018. pp. 257-260
@inproceedings{fdd7ce8a97af49b7814ffcc56051ad89,
title = "Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI",
abstract = "Sufficient decrease of plasma pressure, ion and heat flux along the scrape-off layer of a tokamak fusion reactor are imperative to ensure the survival of the divertor tiles. This specific condition, defined as detachment, occurs within low temperature, high density, highly recyclingplasma that can also be realized in linear plasma devices such as Magnum-PSI [1]. In MagnumPSI, high recycling is achieved by utilizing differential pumping across three vacuum chambers. Experiments have been conducted to mimic detachment in the Magnum-PSI linear device byvarying the neutral background pressure at the chamber of the recycling target via H2 gas puffing [2], while the hydrogen plasma source parameters are kept constant across the experiments. Numerical modelling is carried out to help gain further insights regarding the physics behind detachment. The experiments are benchmarked with a coupled fluid-kinetic approach using the B2.5- EUNOMIA code package [3]. EUNOMIA is a Monte Carlo neutral simulation optimized for lineargeometry. Thomson scattering measurements without gas puffing are used as a plasma boundary condition at the source in the simulation, and the gas pressure in the target chamber will be varied. The resulting electron density and temperature simulated profiles near the target arecompared with profiles measured in experiments. This paper presents the result of the benchmark tests, and identifies the collisional processes and other physical effects relevant to the detached plasma state",
author = "R. Chandra and Akkermans, {G. R.A.} and Classen, {I. G.J.} and R. Perillo and {de Blank}, {H. J.} and P. Diomede and E. Westerhof",
year = "2018",
month = "1",
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language = "English",
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Chandra, R, Akkermans, GRA, Classen, IGJ, Perillo, R, de Blank, HJ, Diomede, P & Westerhof, E 2018, Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI. in J Berndt, S Coda, G Lapenta, C Michaut, S Weber & M Mantsinen (eds), 45th EPS Conference on Plasma Physics, EPS 2018. European Physical Society (EPS), Mulhouse, pp. 257-260, 45th European Physical Society Conference on Plasma Physics, (EPS 2018), Prague, Czech Republic, 2/07/18.

Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI. / Chandra, R.; Akkermans, G. R.A.; Classen, I. G.J.; Perillo, R.; de Blank, H. J.; Diomede, P.; Westerhof, E.

45th EPS Conference on Plasma Physics, EPS 2018. ed. / J. Berndt; S. Coda; G. Lapenta; C. Michaut; S. Weber; M. Mantsinen. Mulhouse : European Physical Society (EPS), 2018. p. 257-260.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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M3 - Conference contribution

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EP - 260

BT - 45th EPS Conference on Plasma Physics, EPS 2018

PB - European Physical Society (EPS)

CY - Mulhouse

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Chandra R, Akkermans GRA, Classen IGJ, Perillo R, de Blank HJ, Diomede P et al. Numerical modelling of detached plasma experiments with differential pumping in Magnum-PSI. In Berndt J, Coda S, Lapenta G, Michaut C, Weber S, Mantsinen M, editors, 45th EPS Conference on Plasma Physics, EPS 2018. Mulhouse: European Physical Society (EPS). 2018. p. 257-260.