On the Importance of Electron Beam Brightness in High Gain Free Electron Lasers

Mitri, S. Di

doi:10.3390/photonics2020317

Cited by 26 publications

(16 citation statements)

References 61 publications

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“…This section gives a brief overview of the electron beam requirements for FELs. Further details are given in [77]. As well as describing properties of the FEL output as given in Section 2.8, the FEL parameter, ρ, defines many other aspects of the system.…”

Section: Electron Beam Requirementsmentioning

confidence: 99%

“…so a high brightness beam is necessary to meet the requirements for high peak current, small energy spread and small transverse emittance [77]. It should be noted however that although a high brightness electron bunch is necessary it is not always sufficient -a bunch must be correctly configured, for example meeting (34) and (37), to be optimal.…”

Section: Electron Beam Requirementsmentioning

confidence: 99%

See 1 more Smart Citation

Short-wavelength free-electron laser sources and science: a review

et al. 2017

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This review is focused on free-electron lasers (FELs) in the hard to soft x-ray regime. The aim is to provide newcomers to the area with insights into: the basic physics of FELs, the qualities of the radiation they produce, the challenges of transmitting that radiation to end users and the diversity of current scientific applications. Initial consideration is given to FEL theory in order to provide the foundation for discussion of FEL output properties and the technical challenges of short-wavelength FELs. This is followed by an overview of existing x-ray FEL facilities, future facilities and FEL frontiers. To provide a context for information in the above sections, a detailed comparison of the photon pulse characteristics of FEL sources with those of other sources of high brightness x-rays is made. A brief summary of FEL beamline design and photon diagnostics then precedes an overview of FEL scientific applications. Recent highlights are covered in sections on structural biology, atomic and molecular physics, photochemistry, non-linear spectroscopy, shock physics, solid density plasmas. A short industrial perspective is also included to emphasise potential in this area.

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Section: Electron Beam Requirementsmentioning

confidence: 99%

Section: Electron Beam Requirementsmentioning

confidence: 99%

Short-wavelength free-electron laser sources and science: a review

et al. 2017

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“…As a result the slice emittance can remain largely unchanged, while the lateral displacement of the slices along the bunch results in a smearing of the transverse phase space and enlargement of the projected emittance. Whilst it is the slice emittance that is often considered of primary importance in the FEL lasing process (as particles only interact within a certain cooperation length [22]), the projected emittance is also an important factor being responsible for the beam brightness [11,23,24].…”

Section: Introductionmentioning

confidence: 99%

Current-horn suppression for reduced coherent-synchrotron-radiation-induced emittance growth in strong bunch compression

Charles

Paganin

Latina

et al. 2017

Phys. Rev. Accel. Beams

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Control of coherent synchrotron radiation (CSR)-induced emittance growth is essential in linear accelerators designed to deliver very high brightness electron beams. Extreme current values at the head and tail of the electron bunch, resulting from strong bunch compression, are responsible for large CSR production leading to significant transverse projected emittance growth. The Linac Coherent Light Source (LCLS) truncates the head and tail current spikes which greatly improves free electron laser (FEL) performance. Here we consider the underlying dynamics that lead to formation of current spikes (also referred to as current horns), which has been identified as caustics forming in electron trajectories. We present a method to analytically determine conditions required to avoid the caustic formation and therefore prevent the current spikes from forming. These required conditions can be easily met, without increasing the transverse slice emittance, through inclusion of an octupole magnet in the middle of a bunch compressor.

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“…High-brightness ultrafast electron sources are key devices for electron diffractive imaging and free-electron lasers determing respectively the image resolution and the best X-ray beam quality with a given electron beam energy [1]. These techniques are crucially limited by the overall electron beam brightness which depends on the total bunch charge and projected emittance.…”

Section: Introductionmentioning

confidence: 99%