cockcroft institute february 2008 low level rf for crab cavities (the ilc in particular) amos...
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DESCRIPTION
Cockcroft Institute February 2008 ILC Layout Phase error in the crab cavity systems causes unwanted kicks. Differential phase errors between the systems causes bunches to miss each other. Crab cavity zero crossings need synchronisation to 90 fs for the 2% luminosity loss budget (for x = m, z = 0.3 mm at 500GeV). One degree r.m.s. crab system to system phase error reduces luminosity by 37%. Not using crab cavities reduces luminosity by