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Comparison between dominant NB and dominant IC heated ELMy H-mode discharges in JET
FOM Institute Rijnhuizen, Association EURATOM-FOM, Nieuwegein, Nederländerna.
Fusion for Energy Joint Undertaking, Barcelona, Spanien.
JET-EFDA Close Support Unit, Culham Science Centre, Abingdon, UK.
FOM Institute Rijnhuizen, Association EURATOM-FOM, Nieuwegein, Nederländerna.
Vise andre og tillknytning
2011 (engelsk)Inngår i: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 51, nr 10, s. 103033-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The experiment described in this paper is aimed at characterization of ELMy H-mode discharges with varying momentum input, rotation, power deposition profiles and ion to electron heating ratio obtained by varying the proportion between ion cyclotron (IC) and neutral beam (NB) heating. The motivation for the experiment was to verify if the basic confinement and transport properties of the baseline ITER H-mode are robust to these changes, and similar to those derived mostly from dominant NB heated H-modes. No significant difference in the density and temperature profiles or in the global confinement were found. Although ion temperature profiles were seen to be globally stiff, some variation of stiffness was obtained in the experiment by varying the deposition profiles, but not one that could significantly affect the profiles in terms of global confinement. This analysis shows the thermal plasma energy confinement enhancement factor to be independent of the heating mix, for the range of conditions explored. Moreover, the response of the global confinement to changes in density and power were also independent of heating mix, reflecting the changes in the pedestal, which is in agreement with globally stiff profiles. Consistently, the pedestal characteristics (pressure and width) and their dependences on global parameters such as density and power were the same during NB only or with predominant IC heating.

sted, utgiver, år, opplag, sider
2011. Vol. 51, nr 10, s. 103033-
HSV kategori
Forskningsprogram
Teknisk fysik med inriktning mot elektricitetslära
Identifikatorer
URN: urn:nbn:se:uu:diva-162711DOI: 10.1088/0029-5515/51/10/103033ISI: 000296603800035OAI: oai:DiVA.org:uu-162711DiVA: diva2:462104
Tilgjengelig fra: 2011-12-06 Laget: 2011-12-05 Sist oppdatert: 2017-12-08bibliografisk kontrollert

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