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

TL;DR

This paper investigates the absence of structure resonances in SIS100 during heavy-ion fast extraction, supported by simulations showing minimal beam loss under space charge conditions in the specified tune range.

Contribution

It provides evidence that structure resonances are absent in SIS100's tune quadrant for heavy-ion fast extraction, enhancing understanding of beam stability.

Findings

No structure resonances observed in the specified tune range.

Simulations indicate low beam loss under space charge conditions.

Supports safe operation for heavy-ion fast extraction in SIS100.

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.