[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7934
The Dipole Wakefield for a Rounded Damped Detuned Linear Accelerator
with Optimised Cell-to-Manifold Coupling
Abstract
A redesign of the basic cell configuration of the Damped Detuned
Structure has been briefly reported in [1] where d the cells are
referred to as ellipsoidal cavities, and accelerator structures
incorporating them are designated DDS 5 and DDS 6. This new structure
type has been renamed RDDS 1, and the first of this series, RDDS 1, is
presently under design and fabrication. The carefully sculpted cell
profile (fabricated on computer controlled lathes at KEK incorporating
diamond point machining) provides a 20% increase in shunt impedance
which, when combined with other parameters, allows for a dramatic
reduction in the RF power required for the NLC (Next Linear
Collider). The detuning profile, damping manifold taper, and the cell
to manifold coupling contant profile have all been carefully optimised
so as to permit decoupling the cells at the ends of the structure from
the manifolds while still adequately minimising the transverse
wake. The decoupling is required in order to fit adequately matched
terminations into the structure. The single structure analysis has
been supplemented with studies of wake degradation arising from
systematic fabrication errors and wake improvement obtained by
combining manifold damping with structure interleaving.
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