Speaker
Description
With the commissioning and operation of the Advanced Photon Source Upgrade storage ring, higher charge is demanded from the injectors including the particle accumulator ring (PAR). Increased charge leads to a growth in PAR bunch length which can lead to inefficient injection into the booster synchrotron. Reduction in the extracted PAR bunch duration has been observed after modifications including reduced impedance kicker chambers and higher 12th harmonic amplitude rf. Recent PAR charge requirements for storage-ring operations are 5-6 nC per bunch for 216 many-bunch mode at 200 mA and 14-15 nC per bunch for 48-bunch timing mode at 130-140 mA. At these charge levels, extracted RMS bunch durations of 400 ps and 490 ps, respectively have been measured. 20 nC is required for 200-mA timing mode. PAR bunch length has been obtained from a fast light detector diagnostic known as the bunch duration monitor (BDM). We have recommissioned the Hamamatsu C5680 streak camera with a M5677 slow vertical sweep scan unit for comparison with the BDM. Bunch length and calibration data from the streak camera have been obtained and will be discussed as will longitudinal modulations observed in the bunch.
Funding Agency
Work supported byby the U.S. D.O.E.,Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02- 06CH11357.
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