42-GHz 0.5-MW ECRH System for Tokamaks SST-1 and Aditya

Shukla, B. K.; Bora, D.; Goswami, Rajiv; Babu, Rajan; Patel, Jatin; Chattopadhyay, P. K.; Srinivasan, R.; Patel, Hriday; Dhorajia, Pragnesh

doi:10.1109/tps.2012.2187075

Cited by 14 publications

(5 citation statements)

References 7 publications

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“…The first switch connected in the line facilitates to operate the gyrotron on dummy load or to launch the power in the tokamak, while the second switch gives an option to launch power either in tokamak SST-1 or in tokamak Aditya [10,13]. The total length of line for ECRH system on SST-1 is ~20 meters and total transmission loss of line is less than 1.1dB.…”

Section: Transmission Linementioning

confidence: 99%

“…There are two ECRH systems 42GHz-500kW [10] and 82.6GHz-200kW [11,12] used used in SST-1 to carry out ECRH experiments at 0.75T, 1.5T and 3.0T magnetic fields. A composite launcher with four mirrors has been designned and fabricated to connect both the systems.…”

Section: Launchermentioning

confidence: 99%

“…The 42GHz/500kW ECRH system is used in tokamak SST-1 [10] to carry out experiments related ECRH assisted breakdown and start-up at fundamental and second harmonic. The SST-1 [11,12] is a steady-state superconducting tokamak.…”

Section: Introductionmentioning

confidence: 99%

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42GHz ECRH assisted Plasma Breakdown in tokamak SST-1

Shukla

Pradhan

Patel

et al. 2015

EPJ Web of Conferences

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Abstract. In SST-1, 42GHz ECRH system has been commissioned to carry out breakdown and heating experiments at 0.75T and 1.5T operating toroidal magnetic fields. The 42GHz ECRH system consists of high power microwave source Gyrotron capable to deliver 500kW microwave power for 500ms duration, approximately 20 meter long transmission line and a mirror based launcher. The ECRH power in fundamental O-mode & second harmonic X-mode is launched from low field side (radial port) of the tokamak. At 0.75T operation, approximately 300 kW ECH power is launched in second harmonic X-mode and successful ECRH assisted breakdown is achieved at low loop_voltage ~ 3V. The ECRH power is launched around 45ms prior to loop voltage. The hydrogen pressure in tokamak is maintained ~ 1x10 -5 mbar and the pre-ionized density is ~ 4x10 12 /cc. At 1.5T operating toroidal magnetic field, the ECH power is launched in fundamental Omode. The ECH power at fundamental harmonic is varied from 100 kW to 250 kW and successful breakdown is achieved in all ECRH shots. In fundamental harmonic there is no delay in breakdown while at second harmonic ~ 40ms delay is observed, which is normal in case of second harmonic ECRH assisted breakdown.

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Section: Transmission Linementioning

confidence: 99%

Section: Launchermentioning

confidence: 99%

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42GHz ECRH assisted Plasma Breakdown in tokamak SST-1

Shukla

Pradhan

Patel

et al. 2015

EPJ Web of Conferences

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“…The operating toroidal magnetic field of SST-1 is 0.75T, 1.5T and 3.0T, however in the beginning phase of tokamak, it is operated at 0.75T and 1.5T magnetic fields. 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.…”

Section: Introductionmentioning

confidence: 99%

Instrumentation and control system architecture of ECRH SST1

Patel

Purohit

et al. 2017

EPJ Web Conf.

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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.

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“…Its schematic is shown in Figure 1 (3,4). Multi identical 87 PSM modules and 1 pulse-width modulation (PWM) module made up a PSM power supply system.…”

Section: Introductionmentioning

confidence: 99%

Design and application of a new control system for tokamak ECRH power supply

Zhang

Huang

2016

Radiation Effects and Defects in Solids

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The biggest challenge of designing and building tokamak electron cyclotron resonance heating (ECRH) pulse step modulation (PSM) power supply is satisfying its required output voltage rising time to be less than 100 µs while suppressing the voltage overshoot to be no more than 1%. To fulfill the two requirements, a new control strategy with startup time in microsecond range is proposed in this paper, and a new control system to realize the control strategy is introduced. The control system was built and tested on 60 kV/50 A ECRH power supply. The experimental results indicate that the control system can restrain the overshoot effectively, increase response speed, and obviously improve the dynamic characteristics of the PSM power supply system. Thus, the proposed control system helps the PSM power supply to meet the design specifications. ARTICLE HISTORY

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42-GHz 0.5-MW ECRH System for Tokamaks SST-1 and Aditya

Cited by 14 publications

References 7 publications

42GHz ECRH assisted Plasma Breakdown in tokamak SST-1

42GHz ECRH assisted Plasma Breakdown in tokamak SST-1

Instrumentation and control system architecture of ECRH SST1

Design and application of a new control system for tokamak ECRH power supply

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