Abstract
The Electron Cyclotron Resonance Heating (ECRH) system is an important heating system for the reliable start-up of tokamak. The 42GHz and 82.6GHz Gyrotron based ECRH systems are used in tokomaks SST-1 and Aditya to carry out ECRH related experiments. The Gyrotrons are high power microwave tubes used as a source for ECRH systems. The Gyrotrons need to be handled with optimum care right from the installation to its Full parameter control operation. The Gyrotrons are associated with the subsystems like: High voltage power supplies (Beam voltage and anode voltage), dedicated crowbar system, magnet, filament and ion pump power supplies and cooling system. The other subsystems are transmission line, launcher and dummy load. A dedicated VME based data acquisition & control (DAC) system is developed to operate and control the Gyrotron and its associated sub system. For the safe operation of Gyrotron, two level interlocks with fail-safe logic are developed. Slow signals that are operated in scale of millisecond range are programmed through software and hardware interlock in scale of microsecond range are designed and developed indigenously. Water-cooling and the associated interlock are monitored and control by data logger with independent human machine interface.
Highlights
The electron cyclotron resonance heating (ECRH) is used for plasma start-up to MHD control in various tokamaks [1,2,3,4]
The 82.6GHz/200KW and 42GHz/500kW ECRH systems are used in tokamak SST-1 [5-6] to carry out experiments related ECRH assisted breakdown and start-up at fundamental and second harmonic
The conditioning electronics is developed to convert all parameters to common control range for central control system of data acquisition & control (DAC)
Summary
The electron cyclotron resonance heating (ECRH) is used for plasma start-up to MHD control in various tokamaks [1,2,3,4]. The 82.6GHz/200KW and 42GHz/500kW ECRH systems are used in tokamak SST-1 [5-6] to carry out experiments related ECRH assisted breakdown and start-up at fundamental and second harmonic. The 42GHz/200KW system is used for starting phase of operation of SST1 [7]. Both ECRH systems 42GHz and 82.6GHz ECRH system consists of Gyrotron, transmission line and a mirror based launcher and other auxiliary power supplies. The transmission consists of matching optic unit, bends, polarizer, DC break and mirror based launcher. The layout of 42GHz ECRH system and actual system in SST-1 tokamak hall are shown in figure and 2 respectively. 82.6GHz and 42GHz ECRH system on SST1.
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