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Influence of impurities on the transition from minority to mode conversion heating in (3He)–H plasmas

Yevgen O. Kazakov (Institutionen för teknisk fysik, Nukleär teknik) ; Tünde Fülöp (Institutionen för teknisk fysik, Nukleär teknik) ; Dirk Van Eester
AIP Conference Proceedings Vol. 1580 (2014), p. 302-305.
[Konferensbidrag, refereegranskat]

Ion cyclotron resonance heating (ICRH) is one of the main auxiliary heating systems used in present-day tokamaks and is planned to be installed in ITER. In the initial full-field phase of ITER operating with hydrogen majority plasmas, fundamental resonance heating of helium-3 ions is one of a few ICRH schemes available. Past JET experiments with the carbon wall revealed a significant impact of impurities on the ICRH performance in (3He)–H plasmas. A significant reduction of the helium-3 concentration, at which the transition from minority ion to mode conversion heating occurs, was found to be due to a high plasma contamination with carbon ions. In this paper we discuss the effect of Be and another impurity species present at JET after the installation of a new ITER-like wall on the transition helium-3 concentration in (3He)–H plasmas. We suggest a potential method for controlling helium-3 level needed for a specific ICRH regime by puffing an extra helium-4 gas to the plasma.

Nyckelord: ICRH, tokamak, minority heating, mode conversion, impurities



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Denna post skapades 2014-02-19. Senast ändrad 2014-09-02.
CPL Pubid: 193977

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)

Ämnesområden

Energi
Hållbar utveckling
Plasmafysik
Fusion

Chalmers infrastruktur