Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW hydrogen and deuterium plasmas

Horvath, Laslo; Maggi, Costanza F.; Chankin, A.; Saarelma, S.; Field, Anthony R.; Aleiferis, S.; Belonohy, E.; Boboc, A.; Corrigan, G.; Delabie, Ephram G.; Flanagan, J.; Frassinetti, L.; Giroud, C.; Harting, D.; Keeling, D.; King, Damian; Maslov, M.; Matthews, G. F.; Menmuir, S.; Silburn, S. A.; Simpson, J.; Sips, A. C.C.; Weisen, H.; Gibson, K. J.

doi:10.1088/1741-4326/abdd77

Title: Isotope dependence of the type I ELMy H-mode pedestal in JET-ILW hydrogen and deuterium plasmas

Journal Article · Tue Mar 09 00:00:00 EST 2021 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abdd77· OSTI ID:1844839

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^[3]; Saarelma, S. ^[2];

^[2]; Aleiferis, S. ^[4];

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^[2]; Corrigan, G. ^[2]; Delabie, Ephram G. ^[5]; Flanagan, J. ^[2];

^[6]; Giroud, C. ^[2]; Harting, D. ^[2]; Keeling, D. ^[2]; King, Damian ^[2]; Maslov, M. ^[2]; Matthews, G. F. ^[2]; Menmuir, S. ^[2]; Silburn, S. A. ^[2] more »

Culham Science Centre, Abingdon (United Kingdom). EUROfusion Consortium; Univ. of York (United Kingdom). York Plasma Institute
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
Max Planck Society, Garching (Germany). Max Planck Institute for Plasma Physics
Institute of Nuclear & Radiological Sciences and Technology, Energy & Safety, Athens (Greece)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
KTH Royal Inst. of Technology, Stockholm (Sweden)
Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE); Aalto Univ., Otaniemi (Finland)
Culham Science Centre, Abingdon (United Kingdom). Jet Exploitation Centre; European Commission, Brussels (Belgium)
Ecole Polytechnique Federale Lausanne (Switzerland)
Univ. of York (United Kingdom). York Plasma Institute

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; Engineering and Physical Sciences Research Council; EUROfusion Consorium

Contributing Organization:: JET Contributors

Grant/Contract Number:: AC05-00OR22725; EP/L01663X/1

OSTI ID:: 1844839

Journal Information:: Nuclear Fusion, Vol. 61, Issue 4; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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