[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7836
Streak-Camera Measurements of the PEP-II High Energy Ring
Abstract
The third commissioning run of the PEP-II High-Energy Ring (HER, the
9-GeV electron ring), in January 1998, included extensive measurements
of single-bunch and multibunch fills using LBNL's dual-axis streak
camera combined with Argonne's 119.0-MHz synchroscan plug-in. For
single bunches, the dependence of bunch length on charge and RF
voltage was studied from 0.5 to 2.5 mA and from 9.5 to 15 MV; the
measured values ranged from 38 to 49 ps rms. The multibunch work
focused on longitudinal instabilities as the current in the ring was
raised to 500 mA, and the length of the bunch train was varied from
100 bunches (with 4.2-ns spacing) to a full ring. Large oscillations
of up to 180 ps peak to peak were observed for bunches half a ring
turn away from the start of the train, especially at higher currents
and for trains filling roughly half the ring. These observations led
to a new fill pattern with more gaps that allowed us to raise the
current to 750 mA by the end of the run.
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