# Abstracts

## XX International Linac Conference

## MOA01 (Poster)

**Presenter: **Courtlandt Bohn (Fermilab)

** email: **clbohn@fnal.gov

**Status: **Complete

**FullText: **
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**Eprint:** physics/0008031
# Theory and Suppression of Multibunch Beam Breakup in
Linear Colliders*

C. L. BOHN, K.-Y. NG (Fermilab)

An analytic theory of cumulative multibunch beam breakup in linear
colliders is developed. Included is a linear variation of transverse focusing across
the bunch train as might be applied, e.g., by chirping the radiofrequency power
sources or by using radiofrequency quadrupole magnets. The focusing variation
saturates the exponential growth of the beam breakup and establishes an algebraic
decay of the transverse bunch displacement versus bunch number. A closed-form
expression for the transverse displacement is developed. It is used to quantify the
total normalized emittance and thereby isolate the region of parameter space
corresponding to high multibunch luminosity. The sensitivity of multibunch beam
breakup to variations in accelerator and beam parameters is likewise
quantified.

*Work supported by the Universities Research Association, Inc. under
contract DE-AC02-76CH00300 with the U.S. Department of Energy.

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