# Abstracts

## XX International Linac Conference

## TUA09 (Poster)

**Presenter: **Roger Jones (SLAC)

** email: **rmj@slac.stanford.edu

**Status: **Complete

**FullText: **
pdf

**Eprint:** physics/0008211
# Local and Fundamental Mode Coupler Damping of the
Transverse Wakefield in RDDS1 Linacs* **

R.M. JONES* (SLAC), T. HIGO, Y. HIGASHI (KEK), N.M. KROLL*
**, (UCSD & SLAC), R.H. MILLER*, J.W. WANG (SLAC)

In fabricating the first X-Band RDDS (Rounded Damped Detuned Structure)
linac measurements are made on short groups of cells prior to bonding the cells. The
design dispersion curves are compared with the frequency measurements. The theory
utilised is based on a circuit model with boundary conditions appropriate to a short
stack of non-uniform cells (the iris radius for example is slowly varying along the
stack). The model reveals the nature of the modes in the structure and is also used
to refit the experimental data to the parameters in a model of the wakefield given
earlier [1]. This method allows a more faithful determination of the wakefield that a
beam will experience as it traverses the structure. Excellent results are obtained on
the frequencies compared to the original design, indicating that the tolerances given
for the fabrication of the cells have been met.

[1] R.M.Jones et al, 'Equivalent Circuit Analysis of the SLAC Damped
Detuned Structure', Proc. of the 5th European Particle Accelerator Conference (EPAC),
p1292,(1996)

*Work supported at SLAC under U.S. Department of Energy grant number
DE-AC03-76SF00515.

**Work supported under U.S. Department of Energy grant number
DE-FG03-93ER40759

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