Arclike variable bunch compressors

Williams, Peter H.; Segurana, Gustavo Pérez; Bailey, I.; Thorin, Sara; Kyle, Bill; Svensson, Jonas Björklund

doi:10.1103/physrevaccelbeams.23.100701

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…The beamline presented here can produce both positive and negative values of longitudinal dispersion ( ). Few other beamlines have been designed with this capability; one example is an arc design for the MAX-IV linear accelerator 61 . Although the MAX-IV arc can produce a larger range of variation, its design follows a curved path.…”

Section: Discussionmentioning

confidence: 99%

A beamline to control longitudinal phase space whilst transporting laser wakefield accelerated electrons to an undulator

Dewhurst

Muratori

Brunetti

et al. 2023

Sci Rep

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Laser wakefield accelerators (LWFAs) can produce high-energy electron bunches in short distances. Successfully coupling these sources with undulators has the potential to form an LWFA-driven free-electron laser (FEL), providing high-intensity short-wavelength radiation. Electron bunches produced from LWFAs have a correlated distribution in longitudinal phase space: a chirp. However, both LWFAs and FELs have strict parameter requirements. The bunch chirp created using ideal LWFA parameters may not suit the FEL; for example, a chirp can reduce the high peak current required for free-electron lasing. We, therefore, design a flexible beamline that can accept either positively or negatively chirped LWFA bunches and adjust the chirp during transport to an undulator. We have used the accelerator design program MAD8 to design a beamline in stages, and to track particle bunches. The final beamline design can produce ambidirectional values of longitudinal dispersion ($$R_{56}$$ R 56 ): we demonstrate values of + 0.20 mm, 0.00 mm and − 0.22 mm. Positive or negative values of $$R_{56}$$ R 56 apply a shear forward or backward in the longitudinal phase space of the electron bunch, which provides control of the bunch chirp. This chirp control during the bunch transport gives an additional free parameter and marks a new approach to matching future LWFA-driven FELs.

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Section: Discussionmentioning

confidence: 99%

A beamline to control longitudinal phase space whilst transporting laser wakefield accelerated electrons to an undulator

Dewhurst

Muratori

Brunetti

et al. 2023

Sci Rep

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“…• Switzerland -SwissFEL; • Swedenthe bunch compressor upgrade plans on MAX IV. 141 In short, the UK developed from a net receiver of specialist information and advice to a valued exporter of the same. Since the closure of ALICE, much of its equipment has been transferred to support other FEL projects.…”

Section: Alice and 4glsmentioning

confidence: 99%

The origins and development of free-electron lasers in the UK

Seddon

Poole

2023

Notes Rec.

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This review article covers close to 45 years of free-electron laser (FEL) activity in the UK from the mid 1970s until 2022. Technical details of the projects are given together with personal insights provided by those who worked on specific projects. Both funded and unfunded projects are included to highlight the breadth of ideas generated over the years; this approach also clearly reveals the evolution in FEL activities from the early imperative to reproduce and understand first results at long wavelength towards the development of ever-higher-quality FEL output at very short wavelengths. Also included are the longer-term and broader benefits of the early projects. One aspect of this is the many years of UK experience in the design, operation and use of FEL facilities (in the UK and abroad) which reveal the wider value, financial and intellectual, of much of the work that has been undertaken and that is often not apparent. Continuous development of the UK technological base in this area has led to innovative contributions on a global scale and considerable financial return.

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“…How far off crest a viable match can be is constrained by the range of R 56 available in the arcs, the energy acceptance of the arcs, and the overhead RF power available. It is advantageous to choose to accelerate on the falling side of crest as, by doing so, one utilises the natural T 566 of an arc to aid linearization [16] with a linearized bunch satisfying the condition…”

Section: Example I: Compressive Matchmentioning

confidence: 99%

“…However, in doing this we must transport a compressed bunch for longer, risking collective effects degrading the bunch prior to interaction. Additionally, in order to effectively transport the beam in this arc, the arc must have good chromatic behaviour over the whole range of the energy acceptance including zeroing higher order transverse dispersions and chromatic amplitudes [16,23].…”

Section: Strategies To Mitigate Common Transport Limitationsmentioning

confidence: 99%

Construction of Self-Consistent Longitudinal Matches in Multi-Pass Energy Recovery Linacs

Segurana,

Bailey,

Williams

2021

Preprint

Self Cite

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Any proposal for an accelerator facility based upon a multipass Energy Recovery Linac (ERL) must possess a self-consistent match in longitudinal phase space, not just transverse phase space. We therefore present a semi-analytic method to determine self-consistent longitudinal matches in any multipass ERL. We apply this method in collider scenarios (embodying an energy spread minimising match) and FEL scenarios (embodying a compressive match), and discuss the consequences of each. As an example of the utility of the method, we prove that the choice of common or separate recirculation transport determines the feasibility of longitudinal matches in cases where disruption, such as synchrotron radiation loss, exists. We show that any high energy multipass ERL collider based upon common recirculation transport will require special care to produce a self-consistent longitudinal match, but that one based upon separate transport is readily available. Furthermore we show that any high energy multipass ERL FEL driver based upon common recirculation transport requires a larger resultant rf beam load than the one based on separate transport, favouring the separate transport designs.

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Arclike variable bunch compressors

Cited by 6 publications

References 11 publications

A beamline to control longitudinal phase space whilst transporting laser wakefield accelerated electrons to an undulator

A beamline to control longitudinal phase space whilst transporting laser wakefield accelerated electrons to an undulator

The origins and development of free-electron lasers in the UK

Construction of Self-Consistent Longitudinal Matches in Multi-Pass Energy Recovery Linacs

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