Radial temperature distributions of C6+ions in the TEXTOR edge plasma measured with lithium beam activated charge exchange spectroscopy
- 1 March 1992
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 32 (3) , 351-359
- https://doi.org/10.1088/0029-5515/32/3/i01
Abstract
A new method of obtaining the temperature of highly charged carbon ions in the boundary layer of tokamak discharges is described. Lithium beam activated charge exchange spectroscopy (Li-CXS) has been employed to measure the spectral profiles of the optical radiation following the electron transfer between impurity ions and a neutral lithium diagnostic beam. By assuming a Maxwellian velocity distribution, ion temperatures are deduced fitting a Gaussian profile to Doppler broadened charge emission lines. Additional line broadening caused by magnetic fields (Zeeman effect) and collisional l-level mixing of the upper electronic state, which may both give rise to several overlapping transitions of slightly different wavelengths, is discussed. The method does not depend on the presence of neutral injection heating beams and is therefore useful for investigating various heating situations, such as Ohmic discharges, beam heated plasmas and high frequency heated plasmas, as well as combinations thereof. The authors present measurements of ohmically heated and beam heated discharges and discusses their implications with regard to the determination of the plasma D+ temperature and the amount of carbon removed from limiter surfaces owing to C6+ to C self-sputteringKeywords
This publication has 12 references indexed in Scilit:
- Absolute concentrations of light impurity ions in tokamak discharges measured with lithium-beam-activated charge-exchange spectroscopyApplied Physics B Laser and Optics, 1991
- High temperature erosion of graphite during extreme limiter loads in TEXTORJournal of Nuclear Materials, 1990
- Unity yield conditions for sputtering of graphite by carbon ionsJournal of Nuclear Materials, 1989
- Impurity production and transport at limitersJournal of Nuclear Materials, 1989
- The dynamic behaviour of the electron temperature profile in the TEXTOR Tokamak plasmaPlasma Physics and Controlled Fusion, 1989
- Density determination in the TEXTOR boundary layer by laser-ablated fast lithium atomsReview of Scientific Instruments, 1988
- Radiative Gaunt factorsMonthly Notices of the Royal Astronomical Society, 1987
- Determination of plasma-ion velocity distribution via charge-exchange recombination spectroscopyPhysical Review A, 1984
- Evaluated Theoretical Cross Section Data for Charge Exchange of Multiply Charged Ions with Atoms. I. Hydrogen Atom-Fully Stripped Ion SystemsJournal of Physical and Chemical Reference Data, 1983
- Excited States Created in Charge Transfer Collisions Between Atoms and Highly Charged IonsPhysica Scripta, 1983