Beam pulsing system for the 4.5 MV electrostatic accelerator

Abstract

A single state 4.5 MV electrostatic accelerator was designed and constructed at Peking University, P.R. China. In order to measure the neutron energy with time of flight method, it is necessary to compress the continuous ion beams into pulses. Therefore, a beam pulsing system has been incorporated in this machine. This paper describes the 9 MHz rf bunching system, the 1.5 MHz rf chopping system, the relevant electronics, the simulations of particle longitudinal motions, the requirements for the transverse focusing system and the experimental results. A duration of the beam pulse width (FWHM) of 1.8 ns was observed.