Fast lithium-beam spectroscopy of tokamak edge plasmas
Li-beam plasma spectroscopy gives access not only to edge plasma density profiles from the collisionally excited Li atoms, but also to the impurity concentration and temperature profiles via line emission induced by electron capture from the injected Li atoms by the impurity ions. The most recent methodological improvement permits a fully consistent determination of absolute edge plasma density profiles by measuring only relative LiI line emission profiles. This is of special interest for investigating rapid edge plasma density fluctuations in connection with ELMs, L-H mode transition, turbulence or edge cooling by impurity injection. This paper describes the capabilities of Li-beam edge plasma spectroscopy by way of illustrative examples from measurements at the tokamak experiment TEXTOR.
Bibliographic Reference: Article: Review of Scientific Instruments, Vol. 64 (1993) No. 8, pp. 2285-2292
Record Number: 199311377 / Last updated on: 1994-11-28
Original language: en
Available languages: en