Volume 63, Number 1, July 2003
|Page(s)||49 - 55|
|Section||Physics of gases, plasmas and electric discharges|
|Published online||01 June 2003|
Results of an experiment relating apparent Doppler ion temperatures with non-thermal velocities in hot-fusion plasmas
Laboratorio Nacional de Fusión, Asociación Euratom-CIEMAT - E-28040 Madrid, Spain
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.
PACS: 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
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