APS injector synchrotron low-level RF system design and test
We describe the control of the RF system for the injector synchrotron (booster) of the 7-GeV Advanced Photon Source. The rf system consists of one klystron and four 5-cell cavities of the LEP type. A block diagram of the system is shown and the low power rf circuitry is described. Voltage and phase feedback are discussed, along with accelerating the beam to 7 GeV. The accelerating voltage is programmed with a waveform generator. Although the acceleration is constant, the power at injection is almost zero and at extraction it is near 600 kW. The power increases with beam energy to replace synchrotron radiation losses. Stability of the rf phase between the two sides of the ring are discussed. Control signals are described which synchronize the bunch during injection from an accumulator ring and for extraction to the 352-MHz bucket in the storage ring. Timing for injection into any bucket in the Storage Ring is accomplished in the rf controls interface located on the VM cards. There is only one bunch accelerated in the booster at a time, so the beam loading of the cavities is negligible. Operating experience during early commissioning efforts will also be outlined.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 90245
- Report Number(s):
- ANL/ASD/CP--83556; CONF-940618--121; ON: DE95015835
- Country of Publication:
- United States
- Language:
- English
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