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Improved confinemen...
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Challis, C. D.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England;Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England
(author)
Improved confinement in JET high beta plasmas with an ITER-like wall
- Article/chapterEnglish2015
Publisher, publication year, extent ...
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2015-04-23
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IOP PUBLISHING LTD,2015
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:uu-424807
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-424807URI
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https://doi.org/10.1088/0029-5515/55/5/053031DOI
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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For complete list of authors see http://dx.doi.org/10.1088/0029-5515/55/5/053031
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The replacement of the JET carbon wall (C-wall) by a Be/W ITER-like wall (ILW) has affected the plasma energy confinement. To investigate this, experiments have been performed with both the C-wall and ILW to vary the heating power over a wide range for plasmas with different shapes. It was found that the power degradation of thermal energy confinement was weak with the ILW; much weaker than the IPB98(y,2) scaling and resulting in an increase in normalized confinement from H-98 similar to 0.9 at beta(N) similar to 1.5 to H-98 similar to 1.2 - 1.3 at beta(N) similar to 2.5 - 3.0 as the power was increased (where H-98 = tau(E)/tau(IPB98(y, 2)) and beta(N) = beta B-T(T)/aI(P) in %T/mMA). This reproduces the general trend in JET of higher normalized confinement in the so-called 'hybrid' domain, where normalized beta is typically above 2.5, compared with 'baseline' ELMy H-mode plasmas with beta(N) similar to 1.5-2.0. This weak power degradation of confinement, which was also seen with the C-wall experiments at low triangularity, is due to both increased edge pedestal pressure and core pressure peaking at high power. By contrast, the high triangularity C-wall plasmas exhibited elevated H-98 over a wide power range with strong, IPB98(y,2)-like, power degradation. This strong power degradation of confinement appears to be linked to an increase in the source of neutral particles from the wall as the power increased, an effect that was not reproduced with the ILW. The reason for the loss of improved confinement domain at low power with the ILW is yet to be clarified, but contributing factors may include changes in the rate of gas injection, wall recycling, plasma composition and radiation. The results presented in this paper show that the choice of wall materials can strongly affect plasma performance, even changing confinement scalings that are relied upon for extrapolation to future devices.
Subject headings and genre
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Andersson Sundén, ErikUppsala universitet,Tillämpad kärnfysik(Swepub:uu)erasu959
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Militello Asp, ElinaUppsala universitet,Institutionen för fysik och astronomi
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Binda, Federico,1987-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)frebi774
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Cecconello, MarcoUppsala universitet,Tillämpad kärnfysik(Swepub:uu)marce924
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Conroy, SeanUppsala universitet,Tillämpad kärnfysik(Swepub:uu)sco17122
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Dzysiuk, NataliaUppsala universitet,Institutionen för fysik och astronomi
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Ericsson, GöranUppsala universitet,Tillämpad kärnfysik(Swepub:uu)ger17122
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Eriksson, Jacob,Dr,1985-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)jacer352
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Hellesen, Carl,1980-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)cahel173
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Hjalmarsson, AndersUppsala universitet,Tillämpad kärnfysik(Swepub:uu)ahj25356
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Possnert, Göran,1951-Uppsala universitet,Tillämpad kärnfysik,Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden(Swepub:uu)gpo27116
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Sjöstrand, Henrik,1978-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)hesjo677
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Skiba, Mateusz,1985-Uppsala universitet,Tillämpad kärnfysik(Swepub:uu)matsk428
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Weiszflog, MatthiasUppsala universitet,Tillämpad kärnfysik(Swepub:uu)mwe25666
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Zychor, I.Inst Plasma Phys & Laser Microfus, PL-01497 Warsaw, Poland
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Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England;Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, EnglandTillämpad kärnfysik
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In:Nuclear Fusion: IOP PUBLISHING LTD55:50029-55151741-4326
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