[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7892
Longitudinal Phase Space Setup for the SLC Beams
Abstract
The longitudinal phase space distribution of the SLC beams is affected
by many different machine parameters and constraints. By using a
technique of over-compression [1] in the ring to linac transfer line,
a small energy spread of 0.12% can be achieved at the end of the linac
for a bunch length of 1.2 mm (Sigma). In the final focus a small
energy spread is desirable to reduce emittance dilution due to
chromatic effects. Optimization of the bunch length is also important
as a longer bunch of 1.2 mm can contribute up to 40% luminosity
enhancement due to disruption. If there is a correlated energy
variation along the bunch, for example due to mistuning of the optimal
rf phase with respect to the beam, the bunch will be further
compressed as it passes through the SLC Arcs. The resulting bunch can
be too short to produce the desired disruption enhancement, but will
radiate more beam-strahlung during collisions giving a false
indication of higher luminosity. This paper discusses the interplay of
these issues from the damping ring to the interaction point.
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