Friday, August 14, 2009, 10:00 am — NSLS-II Seminar Room, Bldg. 817
A proposed high-brightness synchrotron light source (PEP-X) is under design at SLAC. The 4.5-GeV PEP-X storage ring has four theoretical minimum emittance (TME) cells to achieve the very low emittance and two double-bend achromat (DBA) cells to provide spaces for IDs. Damping wigglers will be installed in zero-dispersion straights to reduce the emittance below 0.1 nm. The Touschek lifetime is short due to the small beam’s emittance. High Harmonic Cavity (HHC) can be used to lengthen the bunch in order to improve the Touschek lifetime. Transient beam loading in the main cavities and harminic cavities with a uneven beam filling pattern can cause significant variation of the bunch synchrotron phase and bunch length along the bunch train. We studied the impact of HHC on beam dynamics of a bunch train with a gap. The beam loading effect is anaylized based on the linear theory. We also simulated the phase shift, bunch lengthening and beam instability for various options of the cavities.
Hosted by: Samuel Krinsky
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