Title :
The Alcator C-Mod lower hybrid current drive experiment low power microwave and active control system
Author :
Terry, D. ; Burke, W. ; Grimes, M. ; Gwinn, D. ; Irby, J. ; Kambouchev, N. ; Parker, R. ; Woskov, P.
Author_Institution :
Plasma Sci. & Fusion Center, MIT, Cambridge, MA, USA
Abstract :
A 3 MW (upgradeable to 4 MW) 4.6 GHz Lower Hybrid Current Drive (LHCD) system is being implemented on Alcator C-Mod to control and sustain current profile evolution. The LHCD low-power microwave and active control system, using fast vector modulators, will provide a phase and amplitude controlled driver for each of twelve 4.6 GHz, 250 kW klystrons. Resulting phase and power outputs of each klystron will be monitored by I-Q detectors and made available for closed-loop control of the klystron phase and amplitude during plasma shots. Synchronized digital controllers will be implemented for each control loop and operation will be coordinated with external fast protection circuitry provided in the LHCD transmitter and coupler protection systems.
Keywords :
Tokamak devices; digital control; fusion reactor design; physical instrumentation control; plasma toroidal confinement; plasma transport processes; synchronisation; 250 kW; 3 MW; 4 MW; 4.6 GHz; Alcator C-Mod lower hybrid current drive; I-Q detectors; LHCD; active control system; closed-loop control; coupler protection systems; current profile evolution; digital controllers; fast vector modulators; klystrons; low power microwave; plasma shots; transmitter; Amplitude modulation; Control systems; Detectors; Digital control; Gunshot detection systems; Klystrons; Monitoring; Phase detection; Phase modulation; Plasmas;
Conference_Titel :
Fusion Engineering, 2002. 19th Symposium on
Print_ISBN :
0-7803-7073-2
DOI :
10.1109/FUSION.2002.1027633
