Evaluation of radial particle flux profile based on atomic hydrogen density measurements using laser induced fluorescence and emission at Halpha
- 1 January 1995
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 35 (1), 107-111
- https://doi.org/10.1088/0029-5515/35/1/i09
Abstract
Local atomic hydrogen densities inside plasmas of the Compact Helical System (CHS) were measured using laser induced fluorescence tuned to Hα, and the results were compared with those calculated using a neutral particle simulation code, in order to determine the penetration energy of hydrogen atoms from the chamber wall into the plasma. The results of these and supplementary measurements of Hα emission intensities using CCD cameras and photomultipliers at various toroidal positions yielded local atomic hydrogen density distributions throughout the whole plasma. The distribution of the particle source rate was evaluated from the atomic hydrogen distribution, and then the radial particle flux profile was obtained from a particle continuity equation. Estimated errors for the latter were ±30% at an absolute level and several per cent in the profile shape. The radial particle flux thus obtained is valuable for evaluations of particle diffusion coefficient and convection velocityKeywords
This publication has 10 references indexed in Scilit:
- The effect of magnetic field configuration on particle pinch velocity in compact helical system (CHS)Plasma Physics and Controlled Fusion, 1994
- Measurements of the electron source distribution and particle transport coefficients in JETPlasma Physics and Controlled Fusion, 1993
- Understanding atomic hydrogen behaviour in pumped divertor plasmasJournal of Nuclear Materials, 1992
- Atomic hydrogen behaviour in Heliotron EJournal of Nuclear Materials, 1990
- Compact Helical System Physics and Engineering DesignFusion Technology, 1990
- Recycling and neutral transport in the DIII-D tokamakJournal of Nuclear Materials, 1989
- A measurement of hydrogen ion transport parameters in Tokamak dischargesPlasma Physics and Controlled Fusion, 1987
- Global particle confinement in the Texas Experimental TokamakNuclear Fusion, 1987
- The density dependence of neutral hydrogen density and neutral hydrogen emission from PLTJournal of Nuclear Materials, 1987
- A comparison between laser induced fluorescence at Balmer-alpha and at Lyman-alpha for the measurement of neutral hydrogen densities in magnetically contained fusion plasmasPlasma Physics, 1983