PERFORMANCE OF 5MW MICROWAVE SYSTEM FOR 20MeV PREINJECTOR MICROTRON FOR INDUS-I SRS

At Centre for Advanced Technology, CAT, Indore a 450MeV Synchrotron Radiation Source INDUS-I is in operation. A 20 MeV Microtron has been used as a preinjector for a 450/700 MeV Synchrotron for the 450MeV Storage Ring. Present paper describes the performance review of the 5MW S-Band Microwave System developed at CAT for the microtron. The microwave system has completed over 7years(more than 30,000- hours) of continuous and successful operation. A 5MW klystron is used as the final amplifier and a line type pulse modulator has been developed to supply up to 130kV peak anode voltage to the klystron. The drive signal to the high power klystron is supplied by a stabilized microwave source followed by a driver amplifier chain. The high power microwave to the microtron cavity is supplied from the output of the klystron by means of a pressurised wave- guide line(WR 284) incorporating a four port circulator, dual directional coupler, flexible wave-guide and microwave vacuum window. The paper describes various efforts exercised to shape the pulse output of the klystron modulator as well as other efforts to improve the overall system performance to suit the accelerator demand. Final results of the microwave system and the microtron are discussed