Arclike variable bunch compressors

Williams, Peter H. and Pérez-Segurana, Gustavo and Bailey, Ian R. and Thorin, Sara and Kyle, Bill and Svensson, Jonas Björklund (2020) Arclike variable bunch compressors. Physical Review Accelerators and Beams, 23 (10). ISSN 2469-9888

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Abstract

Electron bunch compressors formed of achromat arcs have a natural advantage over the more commonly used chicane compressors in that linearisation of the longitudinal phase space is of the correct sign to compensate for the curvature imprinted by rf acceleration. Here we extend the utility of arc compressors to enable variation of the longitudinal compaction within a fixed footprint. We also show that this variability can be achieved independently order-by-order in momentum deviation. The technique we employ consists of additional dipoles, leading to the advantageous property that variability can be achieved without incurring significant penalty in terms of chromatic degradation. We show this by comparison to an alternative system where additional quadrupoles are utilised to enable variation of momentum compaction. Each of these alternative approaches are being considered in the context of an upgrade of the MAX IV linac, Sweden, to enable a soft X-ray free-electron laser (FEL) in addition to its existing functions.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review Accelerators and Beams
Additional Information:
8 pages
Subjects:
ID Code:
148207
Deposited By:
Deposited On:
14 Oct 2020 13:55
Refereed?:
No
Published?:
Published
Last Modified:
25 Oct 2020 07:10