Toroidal transport measurement of laser injected lithium in TEXTOR
In order to study the transport properties of lithium atoms and Li(+) ions, lithium was injected into the TEXTOR tokamak using the laser blow-off method. At different toroidal positions of the tokamak, spectroscopic diagnostics with high temporal and spatial resolution were employed in the detection of line radiation from the injected particles. In the first 100-200 microseconds of the injection, the injected beam was found to consist mainly of atoms, and a simple transport model can be used. Ambipolar diffusion or expansion of the lithium ions seems to explain this result. At later times, some of the injected atoms penetrate deeper into the plasma than the calculated penetration depth. It is suggested that either the injected beam contains some pellets, which would naturally penetrate deeper than atoms, or the injected atomic beam causes a local perturbation and cooling of the plasma.
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. II (1993) pp. 675-678
Record Number: 199311158 / Last updated on: 1994-11-29
Original language: en
Available languages: en