Positron accumulator ring (PAR) rf system design and test
We describe the rf system of the positron accumulator ring (PAR) of the 7-GeV Advanced Photon Source. Two rf systems are described: a fundamental frequency system at 9.8 MHz, and a twelfth harmonic system at 117.3 MHz. A block diagram of an accelerating unit is shown and descriptions of various amplifier subsystems are given (including amplifier design, power coupling, VSWR protection, and cavity tuning control). We describe beam accumulation of 24 macropulses from the linac and the 9.8-MHz system used to both accumulate and bunch the beam during the 400-mS injection time. Further bunching of the beam is done during the 100-mS bunching time by the twelfth harmonic system, so that the bunch fits in the 352-MHz bucket in the booster (injector synchrotron). Both tuning angle and cavity voltage of the twelfth harmonic system are preset with a feedforward system using a signal from the beam current monitor. Control signals which synchronize PAR with the linac and booster are described. Operating experience during the PAR commissioning will also be discussed.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10184739
- Report Number(s):
- ANL/ASD/CP-84168; CONF-940618-80; ON: DE94019258; TRN: 94:020194
- Resource Relation:
- Conference: EPAC 94 - 4. European particle accelerator conference,London (United Kingdom),27 Jun - 1 Jul 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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