Multipurpose Beam Pulsing System for the 12UD Pelletron Tandem Accelerator at the University of Tsukuba
Abstract
A beam pulsing system has been developed for a 12 MV tandem accelerator. The system consists of a pre-acceleration chopper, a klystron buncher and a post-acceleration chopper. The pre-acceleration chopper comprises a slow chopper and a fast travelling-wave chopper. Pulsed beams with widths in the range from 10 μs to ∼ 2 s are obtained with the slow chopper, and the repetition periods can be varied from 70 μs to 4 s. The fast chopper produces ion bursts having widths between 0.05 and 0.8 μs with a duty factor of ∼ 10%. The buncher is operated with the two choppers to obtain beam pulses as narrow as a few nanoseconds. Time-of-flight measurements yielded pulse widths 2-4 ns (FWHM) wide for ions in the mass range 1{≤q}A{≤q}28. The ratio of the dark to peak ion current was usually of the order of 10-4.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- October 1983
- DOI:
- 10.1143/JJAP.22.1592
- Bibcode:
- 1983JaJAP..22.1592F