Isotope effect on the detachment onset density in JET ohmic plasmas

V. Solokha; M. Groth; S. Brezinsek; M. Brix; G. Corrigan; C. Guillemaut; D. Harting; S. Jachmich; U. Kruezi; S. Marsen; S. Wiesen

doi:10.1088/1402-4896/ab4bed

Isotope effect on the detachment onset density in JET ohmic plasmas

V. Solokha^*, M. Groth, S. Brezinsek, M. Brix, G. Corrigan, C. Guillemaut, D. Harting, S. Jachmich, U. Kruezi, S. Marsen, S. Wiesen

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › Scientific › peer-review

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Abstract

This paper investigates the dependence of the detachment onset density on the hydrogen isotope species. In JET ohmic plasmas in the ITER-like wall (JET-ILW) materials configuration, the isotope effect is approximately 10%, and it was observed at the outer target only. The heavier isotopes exhibit lower detachment onset densities and density limits. In addition, higher subdivertor molecular pressures and divertor electron densities were observed in the deuterium.(D) discharges compared to the hydrogen.(H) discharges. EDGE2D-EIRENE and standalone EIRENE simulations show that lower conductance of the pumping plenum, scaling with root m(D)/m(H) in the molecular flow regime present in the experiments, is the primary cause for the experimental observation.

Original language	English
Article number	014039
Number of pages	5
Journal	Physica Scripta
Volume	2020
Issue number	1
DOIs	https://doi.org/10.1088/1402-4896/ab4bed
Publication status	Published - 1 Jan 2020
MoE publication type	A4 Conference publication
Event	International Conference on Plasma-Facing Materials and Components for Fusion Applications - Eindhoven, Netherlands Duration: 20 May 2019 → 24 May 2019 Conference number: 17

Keywords

Divertor
Isotope effect
Jet
Neutral transport

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Solokha_Isotope_Effect.PFMC2019-VS-v13-REFAccepted author manuscript, 1.77 MB

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title = "Isotope effect on the detachment onset density in JET ohmic plasmas",

abstract = "This paper investigates the dependence of the detachment onset density on the hydrogen isotope species. In JET ohmic plasmas in the ITER-like wall (JET-ILW) materials configuration, the isotope effect is approximately 10%, and it was observed at the outer target only. The heavier isotopes exhibit lower detachment onset densities and density limits. In addition, higher subdivertor molecular pressures and divertor electron densities were observed in the deuterium.(D) discharges compared to the hydrogen.(H) discharges. EDGE2D-EIRENE and standalone EIRENE simulations show that lower conductance of the pumping plenum, scaling with root m(D)/m(H) in the molecular flow regime present in the experiments, is the primary cause for the experimental observation.",

keywords = "Divertor, Isotope effect, Jet, Neutral transport",

author = "V. Solokha and M. Groth and S. Brezinsek and M. Brix and G. Corrigan and C. Guillemaut and D. Harting and S. Jachmich and U. Kruezi and S. Marsen and S. Wiesen",

note = "| openaire: EC/H2020/633053/EU//EUROfusion ; International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC ; Conference date: 20-05-2019 Through 24-05-2019",

year = "2020",

month = jan,

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doi = "10.1088/1402-4896/ab4bed",

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TY - JOUR

T1 - Isotope effect on the detachment onset density in JET ohmic plasmas

AU - Solokha, V.

AU - Groth, M.

AU - Brezinsek, S.

AU - Brix, M.

AU - Corrigan, G.

AU - Guillemaut, C.

AU - Harting, D.

AU - Jachmich, S.

AU - Kruezi, U.

AU - Marsen, S.

AU - Wiesen, S.

N1 - Conference code: 17

PY - 2020/1/1

Y1 - 2020/1/1

N2 - This paper investigates the dependence of the detachment onset density on the hydrogen isotope species. In JET ohmic plasmas in the ITER-like wall (JET-ILW) materials configuration, the isotope effect is approximately 10%, and it was observed at the outer target only. The heavier isotopes exhibit lower detachment onset densities and density limits. In addition, higher subdivertor molecular pressures and divertor electron densities were observed in the deuterium.(D) discharges compared to the hydrogen.(H) discharges. EDGE2D-EIRENE and standalone EIRENE simulations show that lower conductance of the pumping plenum, scaling with root m(D)/m(H) in the molecular flow regime present in the experiments, is the primary cause for the experimental observation.

AB - This paper investigates the dependence of the detachment onset density on the hydrogen isotope species. In JET ohmic plasmas in the ITER-like wall (JET-ILW) materials configuration, the isotope effect is approximately 10%, and it was observed at the outer target only. The heavier isotopes exhibit lower detachment onset densities and density limits. In addition, higher subdivertor molecular pressures and divertor electron densities were observed in the deuterium.(D) discharges compared to the hydrogen.(H) discharges. EDGE2D-EIRENE and standalone EIRENE simulations show that lower conductance of the pumping plenum, scaling with root m(D)/m(H) in the molecular flow regime present in the experiments, is the primary cause for the experimental observation.

KW - Divertor

KW - Isotope effect

KW - Jet

KW - Neutral transport

UR - http://www.scopus.com/inward/record.url?scp=85084654966&partnerID=8YFLogxK

U2 - 10.1088/1402-4896/ab4bed

DO - 10.1088/1402-4896/ab4bed

M3 - Conference article

AN - SCOPUS:85084654966

SN - 0031-8949

VL - 2020

JO - Physica Scripta

JF - Physica Scripta

IS - 1

M1 - 014039

T2 - International Conference on Plasma-Facing Materials and Components for Fusion Applications

Y2 - 20 May 2019 through 24 May 2019

ER -

Isotope effect on the detachment onset density in JET ohmic plasmas

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Keywords

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