Understanding JET-C quiescent phases with edge harmonic magnetohydrodynamic activity and comparison with behaviour under ITER-like wall conditioning

Brunetti, D.; Ham, C. J.; Graves, J. P.; Lazzaro, E.; Nowak, S.; Mariani, A.; Wahlberg, C.; Cooper, W. A.; Solano, E. R.; Saarelma, S.; Frassinetti, L.; Fontana, M.; Kleiner, A.; Bustos Ramirez, G.; Viezzer, E.

doi:10.1088/1361-6587/ac4d3a

Title: Understanding JET-C quiescent phases with edge harmonic magnetohydrodynamic activity and comparison with behaviour under ITER-like wall conditioning

Journal Article · 18 February 2022 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ac4d3a · OSTI ID:1869956

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Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
Ecole Polytechnique Federale Lausanne (Switzerland)
Istituto per la Scienza e Tecnologia dei Plasmi, Milan (Italy)
Univ. di Milano-Bicocca, Milan (Italy)
Uppsala Univ. (Sweden)
Swiss Alps Fusion Energy (SAFE), Vers l'Eglise (Switzerland)
Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain). Laboratorio Nacional de Fusion
KTH Royal Inst. of Technology, Stockholm (Sweden)
Ecole Polytechnique Federale Lausanne (Switzerland); Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Univ. of Seville (Spain); JET Contributors, et al.

An analysis of edge localised mode-free (quiescent) H-mode discharges exhibiting edge harmonic magnetoydrodynamic activity in the JET-carbon wall machine is presented. It is observed that the otherwise quiescent pulses with multiple-n harmonic oscillations are sustained until a threshold in pedestal electron density and collisionality is crossed. The macroscopic pedestal parameters associated with the quiescent phase are compared with those of a database of JET-ELMy discharges with both carbon and ITER-like wall (ILW). This comparison provides the identification of the existence regions in the relevant pedestal and global plasma parameters for edge harmonic oscillations (EHOs) in JET plasmas. Although the ELMy database scans pedestal collisionality and β values typical of ET-carbon quiescent operation, shaping and current are not simultaneously compatible with EHO existence. Nevertheless, ILW operation with JET-carbon quiescent-like parameters could in principle be achieved, and improved pedestal performance could be observed in more recent JET-ILW pulses.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: EUROfusion Consortium; RCUK; USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1869956

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 4 Vol. 64; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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