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 journalConference articleScientificpeer-review

4 Citations (Scopus)
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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 languageEnglish
Article number014039
Number of pages5
JournalPhysica Scripta
Issue number1
Publication statusPublished - 1 Jan 2020
MoE publication typeA4 Conference publication
EventInternational Conference on Plasma-Facing Materials and Components for Fusion Applications - Eindhoven, Netherlands
Duration: 20 May 201924 May 2019
Conference number: 17


  • Divertor
  • Isotope effect
  • Jet
  • Neutral transport


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