Title :
Improvement of power handling and operation of the LHCD system on JET
Author :
Schild, Ph ; Dobbing, J. ; Ekedahl, A. ; Goniche, M. ; Gormezano, C. ; Lennholm, M. ; Soldner, F.
Author_Institution :
JET Joint Undertaking, Abingdon, UK
Abstract :
The Lower Hybrid Current Drive (LHCD) system has been in operation since 1994. Its power handling capability and its operation have been increased by improvements and installation of feedback controls on klystron power, launcher position, plasma position, plasma internal inductance, loop voltage and gas introduction. The power is applied during the plasma formation and the current ramp-up, providing a target current profile favourable for high neutron rate performance in shear optimisation experiments. To further the design of a launcher for an ITER relevant system, high and low power tests have been carried out on a module allowing the transmission of a TE3.0 mode
Keywords :
Tokamak devices; feedback; fusion reactor design; physical instrumentation control; plasma hybrid waves; plasma radiofrequency heating; ITER relevant system; JET; LHCD system; Lower Hybrid Current Drive; current ramp-up; gas introduction; klystron power; launcher position; loop voltage; plasma formation; plasma internal inductance; plasma position; power handling; power handling capability; shear optimisation experiments; Antenna accessories; Antenna feeds; Control systems; Klystrons; Optical waveguides; Plasma measurements; Plasma waves; Power system reliability; Power transmission lines; Waveguide components;
Conference_Titel :
Fusion Engineering, 1997. 17th IEEE/NPSS Symposium
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-4226-7
DOI :
10.1109/FUSION.1997.687069
