# Abstracts

## XX International Linac Conference

## MOA21 (Poster)

**Presenter: **Karl Bane (SLAC)

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

**Status: **Complete

**FullText: **
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**Eprint:** physics/0008205
# Impedance of a Beam Tube with Small Corrugations

K.L.F. Bane, G.V. Stupakov (SLAC)

In accelerator projects involving the use of very short bunches, such as
the Linac Coherent Light Source (LCLS)---where the rms bunch length in the undulator
section is 30-microns---, it appears that even submicron imperfections in the beam
tube surface can generate an impedance that is unacceptably large. We consider two
periodic models of an imperfect, rough surface, one with small rectangular
corrugations, the other with smooth sinusoidal oscillations. We compare the impedance
of these two models, and apply the results to the LCLS parameters.

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