Measurements of poloidal rotation velocity using charge exchange spectroscopy in a large helical device
- 1 June 2000
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 71 (6), 2360-2366
- https://doi.org/10.1063/1.1150621
Abstract
Absolute measurements of poloidal rotation velocity with the accuracy up to 1 km/s (2 pm in wavelength) were done using charge exchangespectroscopy in a large helical device. Radial profiles of the absolute Doppler shift of charge exchange emission with a beam are obtained from spectra measured with four sets of optical fiber arrays that view downward and upward at the poloidal cross section with and without neutral beam injection. By arranging the optical fiber from four arrays close to each other at the entrance slit, the apparent Doppler shift due to aberrations of the spectrometer and due to interference of the cold component (the charge exchange between He-like oxygen and thermal neutrals 8 pm from the charge exchange emission with a beam) can be eliminated from the measurements. The measured poloidal rotation velocity is 1–3 km/s in the electron diamagnetic direction at half of the plasma minor radius.Keywords
This publication has 15 references indexed in Scilit:
- An overview of charge-exchange spectroscopy as a plasma diagnosticPlasma Physics and Controlled Fusion, 1994
- Role of edge electric field and poloidal rotation in theL-HtransitionPhysical Review Letters, 1990
- Improvement of angular momentum confinement with density peaking on ASDEXNuclear Fusion, 1990
- Charge exchange spectroscopy measurements of ion temperature and toroidal rotation in JETNuclear Fusion, 1989
- Space- and time-resolved measurements of ion temperature with the CVI 5292-Å charge-exchange recombination line after subtracting background radiationReview of Scientific Instruments, 1989
- Multichordal charge exchange recombination spectroscopy on the Doublet III tokamakReview of Scientific Instruments, 1986
- Determination of plasma-ion velocity distribution via charge-exchange recombination spectroscopyPhysical Review A, 1984
- Measurements of plasma ion temperature and rotation velocity using the He II 4686-Å line produced by charge transferApplied Physics Letters, 1983
- Spatially Resolved Measurements of Fully Ionized Low-Impurities in the PDX TokamakPhysical Review Letters, 1982
- Charge-exchange excitation and recombination of oxygen in thetokamakPhysical Review A, 1981