11-15 February 2024
TFZ Wiener Neustadt
Europe/Berlin timezone

SIS100 extraction layout: Influence of non-linear beam dynamics

13 Feb 2024, 12:00
20m
TFZ Wiener Neustadt

TFZ Wiener Neustadt

Viktor Kaplan-Straße 2, 2700 Wiener Neustadt, Austria
Oral presentation Managing Extraction Efficiency

Speaker

David Ondreka (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

Description

The synchrotron SIS100 has been optimized for operation with the partially
stripped ion U28+, resulting in a number of unique challenges: transverse
emittances are comparatively large; the beam has high damage potential due to
the high dE/dx; the lattice must provide efficient collimation of ions losing
electrons in collisions with residual gas to prevent vacuum instabilities.
Resulting in strong focusing, slow extraction requires correction of the large
horizontal chromaticity to ensure high extraction efficiency while satisfying
the tight geometrical constraints. Amplitude dependent tune-shift by
chromaticity sextupoles then causes a bending of the separatrix which needs to
be compensated by octupoles. Additional higher-order effects arise from field
errors of main dipoles and quadrupoles, which were measured to have unexpectedly
large systematic multipoles, significantly changing the geometry of the
separatrix. We discuss possible ways of mitigating the effect of those
nonlinearities using the available corrector magnets as well as consequences for
the choice of slow extraction scheme and commissioning strategy.

Primary author

David Ondreka (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

Co-authors

Björn Galnander (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI)) Stefan Sorge (GSI Helmholtzzentrum für Schwerionenforschung GmbH(GSI))

Presentation Materials