Transverse emittance-preserving arc compressor for high-brightness electron beam-based light sources and colliders

Bunch length magnetic compression is used in high-brightness linacs driving free-electron lasers (FELs) and particle colliders to increase the peak current of the injected beam. To date, it is performed in dedicated insertions made of few degrees bending magnets and the compression factor is limited...

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Bibliographic Details
Published in:Europhysics letters 2015-03, Vol.109 (6), p.62002-p1-62002-p6
Main Authors: Di Mitri, S., Cornacchia, M.
Format: Article
Language:English
Subjects:
29.20.-c
29.27.Bd
41.60.Cr
Beams (radiation)
Brightness
Charge
Degradation
Electron beams
Emittance
Energy recovery
Free electron lasers
Insertion
Light sources
Magnetic compression
Magnets
Mathematical models
Particle accelerators
Particle beams
Synchrotron radiation
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Summary:Bunch length magnetic compression is used in high-brightness linacs driving free-electron lasers (FELs) and particle colliders to increase the peak current of the injected beam. To date, it is performed in dedicated insertions made of few degrees bending magnets and the compression factor is limited by the degradation of the beam transverse emittance owing to emission of coherent synchrotron radiation (CSR). We reformulate the known concept of CSR-driven optics balance for the general case of varying bunch length and demonstrate, through analytical and numerical results, that a 500 pC charge beam can be time-compressed in a periodic 180 deg arc at 2.4 GeV beam energy and lower, by a factor of up to 45, reaching peak currents of up to 2 kA and with a normalized emittance growth at the rad level. The proposed solution offers new schemes of beam longitudinal gymnastics; an application to an energy recovery linac driving FEL is discussed.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/109/62002