Absence of Structure Resonances in SIS100 Tune Quadrant for Heavy Ion Fast Extraction

Abstract

The understanding and avoidance of space charge induced resonances is of utmost importance for long storage times in synchrotrons, as they can lead to halo generation and subsequent beam loss. This report discusses the absence of structure resonances for heavy-ion operation in SIS100 in the tune quadrant foreseen for the fast extraction mode, $18.5 < Q_{x,y} < 19$ . Simulations of beam losses for the duration of the SIS100 accumulation plateau at nominal transverse space charge conditions with a maximum tune shift of $\Delta Q^{SC}_y = -0.3$ supplement the discussion.