Design and development of high power pulsed technologies and systems for H- and proton accelerators

For energizing the 3 MeV RFQ, under development at RRCAT, a 1 MW pulsed RF system operating at 352.2 MHz is required. The characteristics of the pulsed RF delivered to RFQ are important for its correct operation. Keeping in view these requirements, in house design and development of crucial technologies like high voltage solid state pulse modulators, WR 2300 waveguide components, solid state high voltage switches, high voltage high power pulse transformers, advanced solid state Marx modulator, high power RF/Microwave test facilities etc has been initiated. A 1 MW pulsed test stand at 352.21 MHz has been developed and tested using TH 2089 klystrons provided by CERN. A solid state bouncer modulator with 500 microsecs pulse duration, 25 Hz pulse repetition rate, giving output voltage upto 100 kV for energizing klystron for pulsed RFQ has been designed, integrated and testing has been started. Design and prototype development of advanced solid state Marx modulator has also been carried out. The WR 2300 waveguide components have also been developed and tested at low power as well as 1 MW pulsed power at the test stand. The WR 2300 waveguide transmission line with full height dual directional coupler, harmonic filter, three port junction circulator, full height to half height transition, half height waveguide sections, E and H bends, power dividers, flexible waveguides, phase shifter, 45 deg E plane bends, RF loads etc. was assembled and tested at 1 MW pulsed power. Utilizing the experience gathered, design of WR 2300 waveguide transmission system for LEHIPA project of BARC was also done. Development of 1.3 GHz RF systems and cavity test set ups for characterizing the superconducting cavities is in advanced stage. A solid state bouncer compensated long pulse modulator operating at 100 kV, 20 A with 800 microsecs pulse duration at 2 Hz PRR, was successfully designed, developed and supplied to CERN for LINAC 4 proton accelerator project under DAE CERN collaboration in Novel Accelerator Technologies. In this paper, recent developments test results of the high power pulsed systems and wave guide components are presented. (author)