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000028021 084__ $$2WoS$$aPhysics, Fluids & Plasmas
000028021 084__ $$2WoS$$aPhysics, Nuclear
000028021 1001_ $$0P:(DE-HGF)0$$aMaddison, G. P.$$b0
000028021 245__ $$aImpurity-seeded plasma experiments on JET
000028021 260__ $$aVienna$$bIAEA$$c2003
000028021 300__ $$a49 - 62
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000028021 440_0 $$04641$$aNuclear Fusion$$v43$$x0029-5515
000028021 500__ $$aRecord converted from VDB: 12.11.2012
000028021 520__ $$aScaling to larger tokamaks of high confinement plasmas with radiating edges, induced by impurities, is being studied through internationally collaborative experiments on JET. In campaigns till the end of 2000, three different regimes have been explored. A small number of limiter L-mode discharges seeded with neon have most closely repeated the approach used on TEXTOR-94, but different collisionality and particle transport in JET impede central peaking of the density associated with improved confinement. Divertor L-modes at intermediate density, again with neon injection, have pursued transiently enhanced states found on DIII-D. Confinement up to H-mode quality, together with radiation fractions of approximate to40%, have briefly been obtained, though central Z(eff) quickly increases. Most effectively, neon and argon seeding of higher density ELMy H-modes formed mainly at low triangularity on the septum of the MkIIGB divertor, resembling a pumped-limiter arrangement, have been examined. Good confinement has been sustained at densities close to the Greenwald level in 'afterpuff' (AP) phases following the end of main gas fuelling, for little change of central Z(eff) but up to approximate to60% radiation. Outstanding normalized properties up to H-97 = 0.99 at f(Gwd) = 0.94 have thus been achieved, above the conventional H-mode density limit for diverted plasmas. Stationarity of states has also been extended to many energy confinement times by including low, extra gas inputs in the 'AP', suggestive of an optimized fuelling scheme. Further development in 2001 is reported separately in [1]. Accompanying ELMs are generally reduced in frequency though not evidently in size, electron pedestal pressure being almost unchanged from unseeded behaviour. There are indications of the most favourable impurity species scaling with plasma parameters, performance, radiation and its concentration within a mantle all increasing with argon compared to neon in JET. These benefits in terms of integrated properties are just as required for long burning pulses in ITER, supporting its use of a radiating mantle to assist not only power exhaust but performance too. Impurity-seeded H-modes can therefore contribute directly to next-step scenario development.
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000028021 7001_ $$0P:(DE-HGF)0$$aCoffey, I. H.$$b4
000028021 7001_ $$0P:(DE-HGF)0$$aCordey, J. G.$$b5
000028021 7001_ $$0P:(DE-HGF)0$$aDumortier, P.$$b6
000028021 7001_ $$0P:(DE-HGF)0$$aErents, S. K.$$b7
000028021 7001_ $$0P:(DE-HGF)0$$aHawkes, N. C.$$b8
000028021 7001_ $$0P:(DE-HGF)0$$avon Hellermann, M.$$b9
000028021 7001_ $$0P:(DE-HGF)0$$aHillis, D. L.$$b10
000028021 7001_ $$0P:(DE-HGF)0$$aHogan, J.$$b11
000028021 7001_ $$0P:(DE-HGF)0$$aHorton, L. D.$$b12
000028021 7001_ $$0P:(DE-HGF)0$$aIngesson, L. C.$$b13
000028021 7001_ $$0P:(DE-HGF)0$$aJachmich, S.$$b14
000028021 7001_ $$0P:(DE-HGF)0$$aJackson, G. L.$$b15
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000028021 7001_ $$0P:(DE-HGF)0$$aLawson, K. D.$$b18
000028021 7001_ $$0P:(DE-HGF)0$$aLoarte, A.$$b19
000028021 7001_ $$0P:(DE-HGF)0$$aMatthews, G. F.$$b20
000028021 7001_ $$0P:(DE-HGF)0$$aMcKee, G. R.$$b21
000028021 7001_ $$0P:(DE-HGF)0$$aMeigs, A. G.$$b22
000028021 7001_ $$0P:(DE-HGF)0$$aMessiaen, A. M.$$b23
000028021 7001_ $$0P:(DE-HGF)0$$aMilani, F.$$b24
000028021 7001_ $$0P:(DE-HGF)0$$aMonier-Garbet, P.$$b25
000028021 7001_ $$0P:(DE-HGF)0$$aMurakami, M.$$b26
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000028021 7001_ $$0P:(DE-HGF)0$$aStrachan, J. D.$$b35
000028021 7001_ $$0P:(DE-HGF)0$$aTelesca, V. M.$$b36
000028021 7001_ $$0P:(DE-Juel1)5089$$aTokar, M. Z.$$b37$$uFZJ
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000028021 7001_ $$0P:(DE-HGF)0$$aValisa, M.$$b39
000028021 7001_ $$0P:(DE-HGF)0$$aZastrow, S. A.$$b40
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