# Abstracts

## XX International Linac Conference

## THB03 (Poster)

**Presenter: **Michael Pabst (F-Z Juelich)

** email: **M.Pabst@fz-juelich.de

**Status: **Complete

**FullText: **
ps.gz
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**Eprint:** physics/0008106
# High Current Beam Dynamics in an ESS Superconducting
LINAC

M. Pabst, K. Bongardt (Forschungszentrum Juelich GmbH,
Germany)

For the high energy part of the ESS linear accelerator complex a
superconducting (sc) option is presented. The main parameters of this linac are 700
MHz, a final energy of 1.334 GeV and 107 mA beam current. The input energy should be
above 120 MeV in order to start with sc elliptical cavities with a beta greater than
0.5. At least three sections with different beta are needed to accelerate the beam up
to the final energy. Not more than 6 cells per cavity should be used in order to keep
the resulting phase slippage within acceptable limits. The accelerating gradient and
the section length have to be adjusted keeping the zero current tune below 90 deg.
Beam dynamical results for various designs of the ESS sc linac are presented. Fully
3d multiparticle simulations are carried through to look at the effect of phase
slippage in indiviual cavities and the mismatch between different sections. Special
emphasis is put on reducing the resulting halo formation in order to fulfill the
constraints for loss free injection into the ESS compressor rings.

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