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Dimensionless scalings of confinement, heat transport and pedestal stability in JET-ILW and comparison with JET-C
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-9546-4494
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2017 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 59, no 1, 014014Article in journal (Refereed) Published
Abstract [en]

Three dimensionless scans in the normalized Larmor radius rho*, normalized collisionality nu* and normalized plasma pressure beta have been performed in JET with the ITER-like wall (JET-ILW). The normalized energy confinement and the thermal diffusivity exhibit a scaling with rho* consistent with the earlier results obtained in the carbon wall JET (JET-C) and with a gyro-Bohm scaling. In the pedestal, experimental results show that the stability is not dependent on rho*, qualitatively in agreement with the peeling-ballooning (P-B) model. The nu* dimensionless scaling shows that JET-ILW normalized confinement has a stronger dependence on collisionality than JET-C. This leads to a reduction of the difference in the confinement between JET-ILW and JET-C to approximate to 10% at low nu*. The pedestal stability shows an improvement with decreasing nu*. This is ascribed to the increase of the bootstrap current, to the reduction of the pedestal width and to the reduction of the relative shift between pedestal density and temperature position. The beta dimensionless scan shows that, at low collisionality, JET-ILW normalized confinement has no clear dependence with beta, in agreement with part of the earlier scalings. At high collisionality, a reduction of the normalized confinement with increasing beta is observed. This behaviour is driven mainly by the pedestal where the stability is reduced with increasing beta. The P-B analysis shows that the stability reduction with increasing beta at high nu* is due to the destabilizing effect of the increased relative shift.

Place, publisher, year, edition, pages
Culham Sci Ctr, EUROfus Consortium, JET, Abingdon OX14 3DB, Oxon, England. [Frassinetti, L.; Stefanikova, E.] KTH Royal Inst Technol, Div Fus Plasma Phys, SE-10691 Stockholm, Sweden. [Saarelma, S.; Lomas, P.; Rimini, F.; Drewelow, P.; Flanagan, J.; Garzotti, L.; Giroud, C.; Hawks, N.; Joffrin, E.; Kempenaars, M.; Kim, Hyun-Tae; Kruezi, U.; Lupelli, I.; Maggi, C. F.; Menmuir, S.; Romanelli, M.] Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England. [Nunes, I.; Meneses, L.] Univ Lisbon, Inst Plasmas & Fusao Nucl, IST, P-1049001 Lisbon, Portugal. [Beurskens, M. N. A.] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany. [Boom, J. E.] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany. [de la Luna, E.] CIEMAT, Lab Nacl Fus, Madrid 28040, Spain. [Delabie, E.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Loarte, A.] ITER Org, Plasma Operat Directorate, F-13115 St Paul Les Durance, France. [Lomanowski, B.] Aalto Univ, TEKES, Espoo, Finland. [Bilkova, P.; Peterka, M.] AS CR, Vvi, Inst Plasma Phys, Prague, Czech Republic. [Rachlew, E.] KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden., 2017. Vol. 59, no 1, 014014
Keyword [en]
JET-ILW, dimensionless scaling, pedestal, confinement, pedestal stability, heat transport
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-196967DOI: 10.1088/0741-3335/59/1/014014ISI: 000386594300014OAI: diva2:1056023

QC 20161213

Available from: 2016-12-13 Created: 2016-11-28 Last updated: 2016-12-13Bibliographically approved

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Frassinetti, LorenzoRachlew, ElisabethStefanikova, E.
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