Klystron voltage pulse timing experiment

Technical Report · Tue Jun 21 00:00:00 EDT 1983

DOI:https://doi.org/10.2172/7118340· OSTI ID:7118340

Hogg, H; Deruyter, H; Bernstein, J

SLAC has always operated with the voltage pulse applied to each klystron having a flat-top at least 2.5 ..mu..s long. In this region, the voltage is held constant to +-0.5%, limiting the klystron contribution to beam energy spectrum broadening caused by phase and amplitude modulation of the rf wave travelling along the accelerator sections. Since the section filling time is 0.83 ..mu..s and the maximum beam pulse length is 1.6 ..mu..s, a minimum flat-top duration of 2.43 ..mu..s is required, which when rounded up to 2.5 ..mu..s allows for some timing error. The advent of single-bunch beam opertions for SLC, coupled with the use of the SLED pulse compression system (which produces an rf output to the accelerator which changes drastically in one section filling time) and the rapidly rising cost of electrical power experienced in recent years, have made it desirable to review the specifications of the voltage pulse supplied by the modulator to the klystron. Neglecting the possibilities of increasing modulator efficency, which are being studied by others, one can ask whether some use can be made of the energy contained in the skirts of the voltage pulse on each side of the flat top region. Results are reported from an experiment performed as a first step towards finding what penalties are paid for reducing the voltage pulse width so that the skirts encroach upon the time that the rf drive pulse is on.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 7118340
• Report Number(s): SLAC-CN-233; ON: DE84011753
• Resource Relation: Other Information: Paper copy only, copy does not permit microfiche production
• Country of Publication: United States
• Language: English

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