Performance of the beam pulsing system of the 15 UD Pelletron accelerator at Nuclear Science Centre

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 travelling wave deflector (TWD) and a buncher. The chopper is used to chop the dc beam into small portions at the repetition rate of 4 MHz. The function of TWD is to achieve the eleven different repetition rates other than 4 MHz and the buncher finally bunches the chopped beam from the chopper. The performance of this beam pulsing system improved considerably after incorporating a line voltage stabilizer to the system electronics and modifying the feedback loop of the system. The performance of TWD was also improved after some modification in its operation and adding an interlock circuit to TWD electronics. A spiral cavity is now installed in the vault area after the analyzing magnet for the efficient measurement of time resolution of the pulsed beam. (author). 2 refs., 4 figs., 1 tab