# Abstracts

## XX International Linac Conference

## THB14 (Poster)

**Presenter: **Peter D. Smith (General Atomics)

** email: **Peter.Smith@gat.com

**Status: **Complete

**FullText: **
pdf

**Eprint:** physics/0008073
# CCT: A Code to Automate the Design of Coupled
Cavities*

P.D. SMITH (General Atomics)

The CCT (Coupled Cavity Tuning) code, written in support of the APT
Project, automates the RF calculations and sizing of coupled RF cavities. CCT
controls the CCLFISH code, a member of the Superfish [1] series, while CCLFISH
performs RF calculations and tunes the geometry for individual cavities, including an
accelerating cavity (AC) and a coupling cavity (CC). CCT relates the AC and CC by
means of equations that describe the coupling slot between the two cavities. These
equations account for the direct coupling, the next nearest neighbor coupling between
two adjacent AC's, and the frequency shifts in the AC and CC caused by the slot.
Given design objectives of a coupling coefficient, the pi/2 mode frequency of the AC,
and the net frequency of the CC, the code iterates to a consistent solution for the
AC geometry, the CC geometry, and the separation distance between the AC and CC (this
controls the slot size) that satisfies the specified design conditions. The resulting
geometry is used to automate CAD drawing preparation. The code can also be used in
'as-built' mode to calculate the frequencies and coupling of a specified
configuration. An overview of the code and its applications will be
presented.

[1] J. H. Billen and L. M. Young, 'POISSON SUPERFISH,' Los Alamos
National Laboratory report LA-UR-96-1834 (revision March 14, 2000).

* Work supported by U.S. DOE contract DE-AC04-96AL89607

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