AN S-BAND HIGH-POWER WAVE-GUIDE SYSTEM FOR 20-MEV INJECTOR MICROTRON

An S-band waveguide system, used for coupling microwave from a 5 MW klystron (M/s Varian, model: 8262S) to TM010 cylindrical cavity of the 20 MeV microtron, being built at CAT as the injector for 450 MeV synchrotron radiation source, Indus-I, is described. The waveguide system provides an isolation better than 40 dB to the klystron thereby ensuring a stable operation. Also, it has the provision for measuring forward and reflected power flow and the reflected modulated voltage. Further, the waveguide system is pressurised with N2 at 2.5 atm to enable the system for handling 5 MW peak power. The details of the design, fabrication and performance of the waveguide sections and the components are presented. The overall insertion loss is estimated to be 1.2 dB.