Monitoring of the Plasma Isotope Composition by Charge-Exchange Neutral Fluxes in a Rippled Toroidal Magnetic Field

Khudoleev, A. V.; Farhbach, H.-U.
February 2004
Plasma Physics Reports;Feb2004, Vol. 30 Issue 2, p178
Academic Journal
To determine the hydrogen isotope ratio in plasma from charge-exchange neutral fluxes, certain assumptions are traditionally adopted, the most restrictive of which concerns the form of the ion distribution function, which is usually assumed to be Maxwellian. For large tokamaks, however, additional analysis is required in order to determine the energy range in which distortions of the distribution function will not lead to errors in isotope ratio measurements. The possible influence of drift motion on the ion distribution function is considered. Experimental results obtained in the ASDEX-Upgrade tokamak are presented. The role this mechanism plays during the transition to the H-mode in the auxiliary heating regime is compared to that in the ohmic heating regime. � 2004 MAIK �Nauka / Interperiodica�.


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