Performance of X-wave ECH/ECCD on current ramp-up plasmas in fusion tokamaks
Abstract
Heating locality and current drive efficiency of X-wave and O-wave ECH/ECCD from the lower field side are theoretically investigated for tokamak plasmas in the range of the electron temperature -22.5 keV and the density n e = 1.0- m-3, corresponding to the plasmas in the current ramp-up phase in fusion tokamaks. Performance of X-waves is better than that of O-waves up to keV, above which O-wave performance still improves with T e, while X-wave performance deteriorates with T e due to the absorption via second harmonic resonance before the waves penetrate into the fundamental absorption area at the plasma core. When T e increases to 10 keV, the cutoff density for X-waves increases by 15% beyond the cold plasma cutoff density.
- Publication:
-
Nuclear Fusion
- Pub Date:
- October 2018
- DOI:
- 10.1088/1741-4326/aad4c7
- Bibcode:
- 2018NucFu..58j6020M