Abstract
The SIS100 synchrotron as a part of the new FAIR accelerator facility at GSI should be operated at the “space charge limit” for light and heavy-ion beams. Losses due to space charge induced resonance crossing should not exceed a few percent during a full cycle. Detailed magnet field measurements are now available for 72 out of the total 108 main SIS100 dipole magnets. Particle tracking studies including nonlinear field errors up to 7th order in the main magnets together with different space charge models are performed. Because of the long time scales reduced space charge models are employed for tune scans. First comparisons with simulations using a self-consistent space charge solver are discussed as well as potential measures to further improve the options in tune space for the reference intensities and beyond.
Highlights
A very first goal of our studies is to identify working point areas for low loss operation for the design space charge tune shifts and for the present linear and nonlinear SIS100 magnet error model, based on the ongoing magnet measurements
We look at the dependence on the beta-beat correction and on the bunch profile. This contribution is organised as follows: first we present the SIS100 magnet error model, second beam intensities and the resulting space charge tune shifts in SIS100 are discussed, the simulation models and codes are presented together with their underlying space charge models, simulation results are presented and interpreted, we conclude with an outlook
For the present SIS100 magnet error model and for the heavy-ion reference bunches we identified a low loss area in tune space, potentially suitable for high-intensity operation
Summary
The SIS100 magnet system [6] consists of 108 main dipole magnets, 166 main quadrupole magnets, and various correction magnets. The field error data for 72 series dipole magnets is available. The relative field error components for a dipole magnet are defined as. We use a model for the SIS100 dipole magnets, based on the data from the available magnets. The random component is extracted from the available magnets as the sample standard deviation. For the geometrically allowed harmonics (for a dipole magnet B3, B5, B7), the systematic components are given by the average of the available magnets. The present status of the resulting model for the SIS100 dipole magnets is shown, left (r0 = 30 mm). The dots correspond to the systematic components, the error bars show ±2σ of the random components. It is expected that in the series production the random errors, especially for b4, b6, can be smaller, but in this study we use these assumptions
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