ASPECTS OF COMBINED ICRF AND NEUTRAL BEAM HEATING AND CURRENT DRIVE
We have studied a specific example of combined ICRF wave plus beam heating and current-drive in which the resonance is to the inside of the magnetic axis and the beam is used as a minority species. Even in the central regions of the plasma the current-drive efficiency of the combined scheme is lower than for the beams by a factor sim 2--3. Furthermore, the rapid decline in efficiency with minor radius leads to very much lower overall efficiency and the conclusion that combined schemes are of little interest for bulk current-drive. As in previous calculations of ICRF heating and current- drive, the results presented here do not calculate the wave field in a self-consistent manner since no allowance is made for changes in polarisation or absorption due to the presence of non-Maxwellian distributions. Initial results presented here suggest that the inclusion of a self-consistent wave field would not cause qualitative changes to the predictions.
Bibliographic Reference: REPORT JET-P(87)34, 1987, AVAILABILITY: JET, ABINGDON, UK
Record Number: 1989126085600 / Last updated on: 1989-05-01
Available languages: en