PERFORMANCE OF THE BEAM PULSING SYSTEM OF THE 15 UD PELLETRON ACCELERATOR AT NUCLEAR-SCIENCE-CENTER

The Electrostatic International Incorporation (EII), USA supplied beam pulsing system of the 15 UD Pelletron accelerator at Nuclear Science Centre consists of mainly three components viz. a chopper, a travellin g wave deflector [TWD] and a buncher. The chopper is used to chop the de beam into small portions at the repetition rate of 1 MHz. The funct ion of TWD is to achieve the eleven different repetition rates other t han 4 MHz and the buncher finally bunches the chopped beam from the ch opper. The performance of this beam pulsing system improved considerab ly after incorporating a line voltage stabilizer to the system electro nics and modifying the feedback loop of the system. The performance of TWD was also improved after some modification in it's operation and a dding an interlock circuit to TWD electronics. A spiral cavity is now installed in the vault area after the analyzing magnet for the efficie nt measurment of lime resolution of the pulsed beam.