000028021 001__ 28021 000028021 005__ 20240711113836.0 000028021 017__ $$aThis version is available at the following URL: http://dx.doi.org/10.1088/0029-5515/43/1/306 000028021 0247_ $$2DOI$$a10.1088/0029-5515/43/1/306 000028021 0247_ $$2WOS$$aWOS:000180953100006 000028021 0247_ $$2Handle$$a2128/1787 000028021 037__ $$aPreJuSER-28021 000028021 041__ $$aeng 000028021 082__ $$a530 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 000028021 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article 000028021 3367_ $$2DataCite$$aOutput Types/Journal article 000028021 3367_ $$00$$2EndNote$$aJournal Article 000028021 3367_ $$2BibTeX$$aARTICLE 000028021 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000028021 3367_ $$2DRIVER$$aarticle 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. 000028021 536__ $$0G:(DE-Juel1)FUEK250$$2G:(DE-HGF)$$aKernfusion und Plasmaforschung$$cE05$$x0 000028021 588__ $$aDataset connected to Web of Science 000028021 650_7 $$2WoSType$$aJ 000028021 7001_ $$0P:(DE-Juel1)VDB3356$$aBrix, M.$$b1$$uFZJ 000028021 7001_ $$0P:(DE-HGF)0$$aBudny, R.$$b2 000028021 7001_ $$0P:(DE-HGF)0$$aCharlet, M.$$b3 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 000028021 7001_ $$0P:(DE-HGF)0$$aKallenbach, A.$$b16 000028021 7001_ $$0P:(DE-Juel1)130066$$aKoslowski, H. R.$$b17$$uFZJ 000028021 7001_ $$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 000028021 7001_ $$0P:(DE-HGF)0$$aNave, M. F. F.$$b27 000028021 7001_ $$0P:(DE-HGF)0$$aOngena, J.$$b28 000028021 7001_ $$0P:(DE-HGF)0$$aPuiatti, M. 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