Accelerator Activity
Power Supplies Division - Power Supplies Activities 


High Voltage Power Supplies

In a DC accelerator the high voltage supply is the most complex and expensive part that largely determines the equipment depreciation, accelerator efficiency and its radiation cost. In the process of achieving self-reliance and developing the expertise in this high technology area we have successfully completed following jobs.
50 kV/100 mA Rotating Anode X-ray Generator Power Supply

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This high voltage power supply, developed in 1990-91, was donated to Vikram University, Ujjain along with rotating anode x-ray generator RAX-5. The unit consists of a -50 kV/100 mA H.V. supply and 10V/10A filament power supply, floating at -50 kV. A two-stage symmetrical voltage multiplier is fed from a 5kHz/ 5kW solid-state inverter through a (9-0-9) kV ferrite core transformer for generating the high voltage.

 
 50 kV/50 mA Rotating Anode X-ray generator and its power supply

60 kV/ 100 mA Rotating Anode X-ray generator power supply

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This power supply, developed in 1992 - 93, is based on single phase, 50Hz, primary phase control scheme and presently being used by SRS utilization group in RRCAT. The unit basically combines three supplies viz., a 60 kV/ 100 mA high voltage p/s, a 10V/13A filament p/s and a 1000V/10 mA bias voltage p/s. The output parameters are stabilized with in 0.1% for the specified range of input and load variations.

15 kV/50 mA Dual Anode Soft X-ray Source Power Supply

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The dual anode soft x-ray source power supply for ESCA facility was successfully commissioned at Metallurgy Division BARC on 30th Nov. 1994. The unit consists of a zero to 15 kV (DC) thyristor controlled HV power supply and a dual port, current controlled, dc filament power supply with emission stabilization circuits for both the filaments.
The dual filament power supplies rated for 5 V/8A dc are series regulated, so as to ensure a stable emission current. Zero to 25 mA emission current of individual filaments can be set by digital reference circuits with the help of UP/Down switches.

400 kV/10mA Deuteron Accelerator Power Supply

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This power supply required by Neutron Physics Division for neutron generator project was installed in Purnima laboratory of BARC in July 1998. The power supply is developed with an eight stage balanced multiplier stack, fed from a 5kHz / 5kW sine wave inverter. Corona guard rings and HV dome of adequate size and shape are provided for stress control and guarding of internal components. HV output is controlled and regulated by varying the inverter output voltage in a closed feed back loop. The terminal voltage is sensed via a 400 kV resistive divider developed in house.

 400 kV assembly
750 kV/25mA D. C. Accelerator power supply

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 This power supply is required for 750keV industrial electron accelerator, developed at our centre. Utilizing the advantages of high frequency based multiplier schemes, the power supply is developed with a fifteen stage balanced multiplier stack, fed from a 40 kHz/ 40kW IGBT based sine wave inverter. The complete multiplier structure is housed in a pressure vessel along with acceleration column at 5 atmospheric pressure of SF6. The filament power supply required for the generation and control of the electron beam is floating at 750kv. Control of this auxiliary supply is achieved through optical fibers from a PC based control console. High voltage output is controlled and regulated by varying the inverter output voltage in a closed feed back loop. The terminal voltage is sensed via a 750 kV resistive divider developed in house.

Assembly of 750 kV multiplier stack
LabView Based Computer Control of DC Accelerator

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Initially the computer control of DC accelerator was done using GUI software written in C++ language and micro controller 8051. This system has been upgraded to make it compatible with Lab View software, which is far more superior to the previous one. A 4-channel analog and 13-channel digital input card based on parallel port has been developed for the monitoring of different signals of the machine. The control system is based on RS485 multi-drop communication link along with ADPhC 812 micro controller cards. Each card contains 8-channel analog input, 2-channel analog output and 16 digital IOs. Interfacing of these cards with PC is done using Lab-view software. A proprietary protocol for the communication purpose between cards and PC has been developed. Development of the new micro-controller card based on ADPhC 812 has been a remarkable job in this work.


4.2 kV, 5 mA Current Controlled Power Supply

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This power supply has been designed and developed for testing of fast acting vacuum valve being developed in PL&VT lab. The supply uses a current mode controller IC 3844 for regulating the output current at 5 mA in case of a short circuit at the output. The 230 V mains input is rectified and filtered to generate the dc input to the high frequency fly-back chopper circuit which generates 2 kV regulated output through a high voltage ferrite core transformer.

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