Research, design and development activities on high power pulsed RF/Microwave systems and test facilities for particle accelerators

Shrivastava, Purushottam; Wanmode, Yashwant D.; Baxy, Deodatta; Rajput, Vikas; Mohania, Praveen; Mahawar, Ashish; Acharya, M.; Mulchandani, J.; Singh, Harishchandra

doi:10.1109/ivec.2011.5746871

2011 IEEE International Vacuum Electronics Conference (IVEC) 2011

DOI: 10.1109/ivec.2011.5746871

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Research, design and development activities on high power pulsed RF/Microwave systems and test facilities for particle accelerators

Purushottam Shrivastava

Yashwant D. Wanmode

Deodatta Baxy

et al.

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Design and development of a prototype 25 kV, 10 A long pulse Marx modulator for high power klystron

Acharya

Shrivastava

2016

Review of Scientific Instruments

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Research, design, and development of high average power modulators for the proposed Indian Spallation Neutron Source are in progress at Raja Ramanna Centre for Advanced Technology. With this objective, a prototype of 25 kV, 10 A, 1 ms Marx modulator at repetition rate of 1 Hz has been designed and developed which serves as a proof of principle and technology assessment stage for further development of high repetition rate high voltage high average power modulators. Insulated Gate Bipolar Transistor (IGBT) based modules of 2.8 kV switching capability have been used as main modules. The modulator had 8.2% droop in output voltage pulse without any droop compensation circuit. A droop compensation involving 15 corrector modules has been used to reduce the droop up to 1%. We have used IGBT based 250 V switches to realize the corrector module. A microcontroller based control unit was designed and developed for triggering the main and corrector modules. With this control unit, programmable output pulse has been achieved. Electrical isolation between high voltage circuits and control circuit has been achieved by the use of fiber optic based control signal transmission. Output pulses of 1 ms pulse width, 800 ns rise time, and 5 μs fall time have been achieved. The modulator has advantages of modular design, adjustable pulse width, adjustable rise time, and fall time.

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Design and development of a prototype 25 kV, 10 A long pulse Marx modulator for high power klystron

Acharya

Shrivastava

2016

Review of Scientific Instruments

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Compact high voltage, high peak power, high frequency transformer for converter type modulator applications

Reghu

Mandloi

Shrivastava

2016

Review of Scientific Instruments

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The design and development of a compact high voltage, high peak power, high frequency transformer for a converter type modulator of klystron amplifiers is presented. The transformer has been designed to operate at a frequency of 20 kHz and at a flux swing of ±0.6 T. Iron (Fe) based nanocrystalline material has been selected as a core for the construction of the transformer. The transformer employs a specially designed solid Teflon bobbin having 120 kV insulation for winding the high voltage secondary windings. The flux swing of the core has been experimentally found by plotting the hysteresis loop at actual operating conditions. Based on the design, a prototype transformer has been built which is per se a unique combination of high voltage, high frequency, and peak power specifications. The transformer was able to provide 58 kV (pk-pk) at the secondary with a peak power handling capability of 700 kVA. The transformation ratio was 1:17. The performance of the transformer is also presented and discussed.

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Low Loss Voltage Equalization Scheme for Series-Connected BiMOSFETs for Pulsed Power Applications

Acharya

Harini

Reghu

et al. 2021

IETE Journal of Research

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Research, design and development activities on high power pulsed RF/Microwave systems and test facilities for particle accelerators

Cited by 4 publications

References 0 publications

Design and development of a prototype 25 kV, 10 A long pulse Marx modulator for high power klystron

Design and development of a prototype 25 kV, 10 A long pulse Marx modulator for high power klystron

Compact high voltage, high peak power, high frequency transformer for converter type modulator applications

Low Loss Voltage Equalization Scheme for Series-Connected BiMOSFETs for Pulsed Power Applications

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