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Abstract

The paper presents the results of the experiments carried out in JET with the Mark II divertor to study ELMy H modes at high density. In these experiments we varied the effective ion mass of the plasma, the input power, plasma current and the edge magnetic shear. The variation of density was achieved by gas fuelling.

The paper focuses on two main issues: the variation of the global energy confinement with density and the scaling of the H-mode pedestal. We find that the density dependence in the ITER97-p(y) scaling is not confirmed by the experiment when one approaches the density limit. For the high density regime in ELMy H-modes we propose a density independent scaling that includes the plasma triangularity in the regression variables. The core energy content of the plasma is correlated to the edge pedestal parameters, consistently with a mixed Bohm-gyroBohm transport model for H mode plasmas. .

Additional information

Authors: SAIBENE G, JET Joint Undertaking, Abingdon (GB);HORTON L D, JET Joint Undertaking, Abingdon (GB);SARTORI R, JET Joint Undertaking, Abingdon (GB);BALET B, JET Joint Undertaking, Abingdon (GB);CLEMENT S, JET Joint Undertaking, Abingdon (GB);CONWAY G D, JET Joint Undertaking, Abingdon (GB);CORDEY J G, JET Joint Undertaking, Abingdon (GB);ESCH H P L, JET Joint Undertaking, Abingdon (GB);INGESSON C, JET Joint Undertaking, Abingdon (GB);LINGERTAT J, JET Joint Undertaking, Abingdon (GB);MONK R D, JET Joint Undertaking, Abingdon (GB);PARAIL V, JET Joint Undertaking, Abingdon (GB);SMITH R, JET Joint Undertaking, Abingdon (GB);TARONI A, JET Joint Undertaking, Abingdon (GB);THOMSEN K, JET Joint Undertaking, Abingdon (GB);HELLERMANN M, JET Joint Undertaking, Abingdon (GB)
Bibliographic Reference: Article: JET-P(98)86
Record Number: 199910835 / Last updated on: 1999-06-11
Category: PUBLICATION
Original language: en
Available languages: en