Indigenous development of   microwave tubes like 2MW S-Band pulsed magnetrons, 5MW S-Band pulsed klystron, 3MW S-Band pulsed magnetrons and 40kV, 3kA high voltage thyratrons was taken up by, to have self reliance in the field of microwave devices and to have their consistent supply for the Indian accelerator programme RRCAT in collaboration with CEERI, Pilani under BRNS funding., RRCAT initiated development of 2MW S-Band pulsed magnetrons in collaboration with CEERI, Pilani. The design, development and testing of the microwave test facilities for ageing, conditioning and performance testing of Indian magnetrons, was successfully done by RRCAT indigenously.  After the rigorous testing, the test facility was shifted, installed and commissioned at CEERI, Pilani by RRCAT.  Over a period of 10 years, nine prototypes were aged and tested,   two magnetrons were life tested and two magnetrons under production programme have been successfully conditioned and tested. Testing of more numbers is underway.  Under this 9 prototypes were developed and tested on the facilities developed by RRCAT and after successful development of the magnetrons in the prototype mode Pilot production of 2MW magnetrons was entrusted upon CEERI by RRCAT under BRNS project.

Pilot Production of 2MW S-Band Magnetrons: Development of prototypes of 2MW magnetron was completed and pilot production of this tube has been done at CEERI , Pilani. Seven tubes   under pilot production have been fabricated and their testing is in progress.

Table 1 Specifications of Indigenous 2MW S-Band  magnetron
Peak output power	2 MW
Average power	2 kW
Frequency range	2991-3004 MHz
RF pulse duration	4 micro sec
Repetition rate	250 Hz
Peak Anode voltage	42 kV
Peak anode current	100 amp

Indigenous development of 5 MW S-Band pulsed klystrons: RRCAT took up development of 5MW S-Band klystrons indigenously in collaboration with CEERI Pilani. The development of klystron prototype is completed. These klystrons are very crucial devices, for energizing the 10-20 MeV electron accelerators¹, which are developed in the country for various industrial, medical and scientific applications.  A test station has been developed indigenously at RRCAT for these klystrons. It   consists of a 12 MW peak power 130kV klystron pulse modulator, a 1: 10 pulse transformer, 130kV high voltage deck having high voltage pulse divider, pulse current transformer as well indigenously built klystron socket, filament supplies, klystron support structure and pulse transformer oil tank. After development /rigorous testing the test stand was shifted to CEERI and was installed and commissioned there by RRCAT. Gun collector test module and prototypes of the 5MW klystron were tested, aged and conditioned at high power using this test stand. Three prototypes of the klystron have been successfully fabricated and tested.

3MW magnetrons: Two prototypes under the project have been fabricated and testing in the test station at RRCAT is under way.

40KV Thyratrons: So far four prototypes under this project have been developed and supplied to RRCAT for partial testing. Two have been tested for limited ratings. Fifth prototype has also been fabricated at CEERI.