Europhys. Lett., 63 (1) , pp. 49-55 (2003)
Results of an experiment relating apparent Doppler ion temperatures with non-thermal velocities in hot-fusion plasmasK. J. McCarthy, B. Zurro, R. Balbín, A. Baciero, J. Herranz and I. Pastor
Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT - E-28040 Madrid, Spain
(Received 3 April 2003; accepted 5 May 2003)
We present the results of an experiment carried out in the core of a hot magnetically confined plasma to substantiate a claimed relationship between apparent ion temperatures and non-thermal velocities. For this, the heaviest ions were injected into the plasma by laser ablation and localised ion temperatures were obtained from Doppler line-widths and energy spectra of escaped charge-exchange neutrals. Strong collisional coupling between majority ( ) and impurity ions ensures that these should be well thermalised. However, the linear dependence found between apparent ion temperature and mass ( , , , ) permits one to relate apparent Doppler ion temperatures to non-thermal velocities. The implications for the physics and diagnosis of thermonuclear plasmas are addressed.
52.25.Vy - Impurities in plasmas.
52.35.Ra - Plasma turbulence.
52.55.Hc - Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices.
© EDP Sciences 2003