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Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW hydrogen and deuterium plasmas
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- Horvath, L. (author)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.;Univ York, York Plasma Inst, Dept Phys, York YO10 5DD, N Yorkshire, England.
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- Maggi, C. F. (author)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
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- Chankin, A. (author)
- Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany.
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- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England;Univ York, York Plasma Inst, Dept Phys, York YO10 5DD, N Yorkshire, England. Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England. (creator_code:org_t)
- 2021-03-09
- 2021
- English.
- In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 61:4
- Journal article (peer-reviewed)
Abstract
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- The pedestal structure, edge transport and linear MHD stability have been analyzed in a series of JET with the ITER-like wall hydrogen (H) and deuterium (D) type I ELMy H-mode plasmas. The pedestal pressure is typically higher in D than in H at the same input power and gas rate, with the difference mainly due to lower density in H than in D (Maggi et al (JET Contributors) 2018 Plasma Phys. Control. Fusion 60 014045). A power balance analysis of the pedestal has shown that higher inter-ELM separatrix loss power is required in H than in D to maintain a similar pedestal top pressure. This is qualitatively consistent with a set of interpretative EDGE2D-EIRENE simulations for H and D plasmas, showing that higher edge particle and heat transport coefficients are needed in H than in D to match the experimental profiles. It has also been concluded that the difference in neutral penetration between H and D leads only to minor changes in the upstream density profiles and with trends opposite to experimental observations. This implies that neutral penetration has a minor role in setting the difference between H and D pedestals, but higher ELM and/or inter-ELM transport are likely to be the main players. The interpretative EDGE2D-EIRENE simulations, with simultaneous upstream and outer divertor target profile constraints, have indicated higher separatrix electron temperature in H than in D for a pair of discharges at low fueling gas rate and similar stored energy (which required higher input power in H than in D at the same gas rate). The isotope dependence of linear MHD pedestal stability has been found to be small, but if a higher separatrix temperature is considered in H than in D, this could lead to destabilization of peeling-ballooning modes and shrinking of the stability boundary, qualitatively consistent with the reduced pedestal confinement in H.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- tokamak
- isotope effect
- H-mode
- pedestal
- confinement
- JET-ILW
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Horvath, L.
- Maggi, C. F.
- Chankin, A.
- Saarelma, S.
- Field, A. R.
- Aleiferis, S.
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- Belonohy, E.
- Boboc, A.
- Corrigan, G.
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- Matthews, G. F.
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- Gibson, K. J.
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