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Overview of JET res...
Overview of JET results
- Artikel/kapitelEngelska2003
Förlag, utgivningsår, omfång ...
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2003-12-02
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IOP Publishing,2003
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:kth-12481
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12481URI
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https://doi.org/10.1088/0029-5515/43/12/002DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Artikeln har flera hundra författare. Enbart de två första och samtliga KTH-författare registrerade.
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Scientific and technical activities on JET focus on the issues likely to affect the ITER design and operation. Our understanding of the ITER reference mode of operation, the ELMy H-mode, has progressed significantly. The extrapolation of ELM size to ITER has been re-evaluated. Neoclassical tearing modes have been shown to be meta-stable in JET, and their beta limits can be raised by destabilization (modification) of sawteeth by ion cyclotron radio frequency heating (ICRH). Alpha simulation experiments with ICRH accelerated injected 4 (He) beam ions provide a new tool for fast particle and magnetohydrodynamic studies, with up to 80-90% of plasma heating by fast 4 He ions. With or without impurity seeding, a quasi-steady-state high confinement (H-98 = 1), high density(n(e)/n(GW) = 0.9-1) and high beta (betaN = 2) ELMy H-mode has been achieved by operating near the ITER triangularity ( similar to 0.40-0.5) and safety factor (q(95) similar to 3), at Z(eff) similar to 1.5-2. In advanced tokamak (AT) scenarios, internal transport barriers (ITBs) are now characterized in real time with a new criterion, rhoT(*). Tailoring of the current profile with T lower hybrid current drive provides reliable access to a variety of q profiles, lowering access power for barrier formation. Rational q surfaces appear to be associated with ITB formation. Alfven cascades were observed in reversed shear plasmas, providing identification of q profile evolution. Plasmas with 'current holes' were observed and modelled. Transient high confinement AT regimes with H-89 = 3.3, beta(N) = 2.4 and ITER-relevant q < 5 were achieved with reversed magnetic shear. Quasi-stationary ITBs are developed with full non-inductive current drive, including similar to 50% bootstrap current. A record duration of ITBs was achieved, up to 11 s, approaching the resistive time. For the first time, pressure and current profiles of AT regimes are controlled by a real-time feedback system, in separate experiments. Erosion and co-deposition studies with a quartz micro-balance show reduced co-deposition. Measured divertor thermal loads during disruptions in JET could modify ITER assumptions.
Ämnesord och genrebeteckningar
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elmy h-modes internal transport barriers joint european torus current drive interaction issues tritium recovery plasma rotation high-density confinement shear
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Solano, E.R.
(författare)
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Brzozowski, JerzyKTH,Alfvénlaboratoriet
(författare)
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Hellsten, TorbjörnKTH,Alfvénlaboratoriet(Swepub:kth)u16w7v9f
(författare)
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Laxåback, MartinKTH,Alfvénlaboratoriet(Swepub:kth)u1oieq86
(författare)
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Rachlew, ElisabethKTH,Fysik(Swepub:kth)u12i3o9i
(författare)
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Rubel, MarekKTH,Alfvénlaboratoriet(Swepub:kth)u1vrej8y
(författare)
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KTHAlfvénlaboratoriet
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Nuclear Fusion: IOP Publishing43:12, s. 1540-15540029-55151741-4326
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