FIRST SPECTROSCOPIC CHARGE EXCHANGE MEASUREMENTS DURING NEUTRAL INJECTION ON JET
The CXRS results obtained demonstrated the potential for measurement of local ion temperature, toroidal plasma rotation and impurity concentration. The ion temperature derived from the Doppler broadened CX line profiles of oxygen, carbon and helium agree reasonably with values determined by independent ion temperature diagnostics on JET. A slight increase of derived ion temperature with increasing Z needs further investigation. A preliminary analysis of the calibrated photon fluxes making use of electron source rate data determined by the PENCIL code is based on the assumption that only the full energy component contributes to the CXR signal and that halo effects and excitation by metastables from thermal atoms can be ignored. Comparison of JET pulses with comparable NB and plasma parameters (spectrometer tuned to the spectra of O**8+ and C**6+), indicates a value n-C/n-O of 3 to 5 decreasing with increasing electron density during injection to 2, in rough agreement with results obtained by transport analysis. Further analyses in progress involve detailed modelling of the atomic physics and local neutral particle densities.
Bibliographic Reference: 13TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, SCHLIERSEE (GERMANY), APRIL 14-18, 1986 PP. 117-120 WRITE TO THE PUBLICATIONS OFFICER, JET JOINT UNDERTAKING, ABINGDON, OXON, OX14 3EA (UK) MENTIONING REPORT JET-P(86)15, 1986
Record Number: 1989125007300 / Last updated on: 1987-01-01
Available languages: en