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Global and pedestal...
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Beurskens, M. N. A.
(author)
Global and pedestal confinement in JET with a Be/W metallic wall
- Article/chapterEnglish2014
Publisher, publication year, extent ...
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2014-03-10
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IOP Publishing,2014
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-144936
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-144936URI
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https://doi.org/10.1088/0029-5515/54/4/043001DOI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20140508
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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.
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Frassinetti, LorenzoKTH,Fusionsplasmafysik(Swepub:kth)u1sfgalb
(author)
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Challis, C.
(author)
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Giroud, C.
(author)
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Saarelma, S.
(author)
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Alper, B.
(author)
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Angioni, C.
(author)
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Bilkova, P.
(author)
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Bourdelle, C.
(author)
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Brezinsek, S.
(author)
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Buratti, P.
(author)
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Calabro, G.
(author)
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Eich, T.
(author)
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Flanagan, J.
(author)
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Giovannozzi, E.
(author)
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Groth, M.
(author)
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Hobirk, J.
(author)
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Joffrin, E.
(author)
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Leyland, M. J.
(author)
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Lomas, P.
(author)
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de la Luna, E.
(author)
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Kempenaars, M.
(author)
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Maddison, G.
(author)
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Maggi, C.
(author)
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Mantica, P.
(author)
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Maslov, M.
(author)
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Matthews, G.
(author)
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Mayoral, M-L
(author)
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Neu, R.
(author)
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Nunes, I.
(author)
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Osborne, T.
(author)
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Rimini, F.
(author)
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Scannell, R.
(author)
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Solano, E. R.
(author)
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Snyder, P. B.
(author)
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Voitsekhovitch, I.
(author)
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de Vries, Peter
(author)
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KTHFusionsplasmafysik
(creator_code:org_t)
Related titles
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In:Nuclear Fusion: IOP Publishing54:4, s. 043001-0029-55151741-4326
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Beurskens, M. N. ...
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Frassinetti, Lor ...
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Challis, C.
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Giroud, C.
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Saarelma, S.
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Alper, B.
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Angioni, C.
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Bilkova, P.
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Bourdelle, C.
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Brezinsek, S.
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Buratti, P.
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Calabro, G.
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Eich, T.
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Flanagan, J.
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Giovannozzi, E.
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Groth, M.
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Hobirk, J.
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Joffrin, E.
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Leyland, M. J.
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Lomas, P.
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de la Luna, E.
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Kempenaars, M.
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Maddison, G.
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Maggi, C.
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Mantica, P.
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Maslov, M.
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Matthews, G.
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Mayoral, M-L
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Neu, R.
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Nunes, I.
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Osborne, T.
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Rimini, F.
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Scannell, R.
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Solano, E. R.
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Snyder, P. B.
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Voitsekhovitch, ...
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de Vries, Peter
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