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

L. Horvath*, C. F. Maggi, A. Chankin, S. Saarelma, A. R. Field, S. Aleiferis, E. Belonohy, A. Boboc, G. Corrigan, E. G. Delabie, J. Flanagan, L. Frassinetti, C. Giroud, D. Harting, D. Keeling, D. King, M. Maslov, G. F. Matthews, S. Menmuir, S. A. SilburnJ. Simpson, A. C.C. Sips, H. Weisen, K. J. Gibson, JET Contributors

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

3 Sitaatiot (Scopus)

Abstrakti

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.

AlkuperäiskieliEnglanti
Artikkeli046015
Sivumäärä17
JulkaisuNuclear Fusion
Vuosikerta61
Numero4
DOI - pysyväislinkit
TilaJulkaistu - huhtikuuta 2021
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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