Global and pedestal confinement in JET with a Be/W metallic wall (Articolo in rivista)

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  • Global and pedestal confinement in JET with a Be/W metallic wall (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/54/4/043001 (literal)
Alternative label
  • Beurskens, M. N. A.; Frassinetti, L.; Challis, C.; Giroud, C.; Saarelma, S.; Alper, B.; Angioni, C.; Bilkova, P.; Bourdelle, C.; Brezinsek, S.; Buratti, P.; Calabro, G.; Eich, T.; Flanagan, J.; Giovannozzi, E.; Groth, M.; Hobirk, J.; Joffrin, E.; Leyland, M. J.; Lomas, P.; de la Luna, E.; Kempenaars, M.; Maddison, G.; Maggi, C.; Mantica, P.; Maslov, M.; Matthews, G.; Mayoral, M-L; Neu, R.; Nunes, I.; Osborne, T.; Rimini, F.; Scannell, R.; Solano, E. R.; Snyder, P. B.; Voitsekhovitch, I.; de Vries, Peter (2014)
    Global and pedestal confinement in JET with a Be/W metallic wall
    in Nuclear fusion
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Beurskens, M. N. A.; Frassinetti, L.; Challis, C.; Giroud, C.; Saarelma, S.; Alper, B.; Angioni, C.; Bilkova, P.; Bourdelle, C.; Brezinsek, S.; Buratti, P.; Calabro, G.; Eich, T.; Flanagan, J.; Giovannozzi, E.; Groth, M.; Hobirk, J.; Joffrin, E.; Leyland, M. J.; Lomas, P.; de la Luna, E.; Kempenaars, M.; Maddison, G.; Maggi, C.; Mantica, P.; Maslov, M.; Matthews, G.; Mayoral, M-L; Neu, R.; Nunes, I.; Osborne, T.; Rimini, F.; Scannell, R.; Solano, E. R.; Snyder, P. B.; Voitsekhovitch, I.; de Vries, Peter (literal)
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  • 54 (literal)
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  • 13 (literal)
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  • 4 (literal)
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  • ISI Web of Science (WOS) (literal)
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  • JET EFDA, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England; EURATOM CCFE Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England; KTH, Assoc EURATOM VR, Div Fus Plasma Phys, SE-10044 Stockholm, Sweden; EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany; EURATOM IPP ASCR Assoc Prague, Prague, Czech Republic; Assoc Euratom CEA, IRFM, F-13108 St Paul Les Durance, France; Forschungszentrum Julich, EURATOM Assoc, D-52425 Julich, Germany; CR Frascati, Assoc EURATOM ENEA Fus, Frascati, Italy; Aalto Univ, EURATOM Assoc, Espoo 02015, Finland;Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England; Asociac EURATOM CIEMAT, Lab Nacl Fus, Madrid, Spain; Assoc Euratom ENEA CNR, Ist Fis Plasma P Caldirola, Milan, Italy; Assoc EURATOM IST, Inst Plasmas & Fusao Nucl, Lisbon, Portugal; Gen Atom Co, San Diego, CA 92186 USA; Assoc EURATOM DIFFER, NL-3430 BE Nieuwegein, Netherlands (literal)
Titolo
  • Global and pedestal confinement in JET with a Be/W metallic wall (literal)
Abstract
  • Type I ELMy H-mode operation in JET with the ITER-like Be/W wall (JET-ILW) generally occurs at lower pedestal pressures compared to those with the full carbon wall (JET-C). The pedestal density is similar but the pedestal temperature where type I ELMs occur is reduced and below to the so-called critical type I-type III transition temperature reported in JET-C experiments. Furthermore, the confinement factor H-98(y,H- 2) in type I ELMy H-mode baseline plasmas is generally lower in JET-ILWcompared to JET-C at low power fractions Ploss/P-thr,(08)< 2 (where P-loss is (P-in-dW/dt), and P-thr,(08) the L-H power threshold from Martin et al 2008 (J. Phys. Conf. Ser. 123 012033)). Higher power fractions have thus far not been achieved in the baseline plasmas. At Ploss/P-thr,P- 08 > 2, the confinement in JET-ILW hybrid plasmas is similar to that in JET-C. A reduction in pedestal pressure is the main reason for the reduced confinement in JET-ILW baseline ELMy H-mode plasmas where typically H-98((y, 2)) = 0.8 is obtained, compared to H-98((y, 2)) = 1.0 in JET-C. In JET-ILW hybrid plasmas a similarly reduced pedestal pressure is compensated by an increased peaking of the core pressure profile resulting in H-98((y, 2)) <= 1.25. The pedestal stability has significantly changed in high triangularity baseline plasmas where the confinement loss is also most apparent. Applying the same stability analysis for JET-C and JET-ILW, the measured pedestal in JET-ILW is stable with respect to the calculated peeling-ballooning stability limit and the ELM collapse time has increased to 2ms from typically 200 mu s in JET-C. This indicates that changes in the pedestal stability may have contributed to the reduced pedestal confinement in JET-ILW plasmas. A comparison of EPED1 pedestal pressure prediction with JET-ILW experimental data in over 500 JET-C and JET-ILW baseline and hybrid plasmas shows a good agreement with 0.8 < (measured p(ped))/(predicted p(ped), EPED) < 1.2, but that the role of triangularity is generally weaker in the JET-ILW experimental data than in the model predictions. (literal)
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