Reducing the sensitivity of a free-electron laser to electron energy

Smith, T. I.; Madey, J. M. J.; Elias, Luis R.; Deacon, D. A. G.

doi:10.1063/1.326564

Cited by 82 publications

(35 citation statements)

References 3 publications

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“…Based on Eq. (1), the resonant condition yielding λ r can be met over the full transverse dimension by canting the poles of the undulator [18,19] such that the horizontal variation in K(x) compensates for the variation in γ(x). The program has an operational LPA (with impressive LPA e-beam parameters, see Ref.…”

Section: Lpa Fel Experimentsmentioning

confidence: 99%

Free-electron lasers driven by laser plasma accelerators

Tilborg

Barber

Isono

et al. 2017

AIP Conference Proceedings

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Abstract. Laser-plasma accelerators (LPAs) have the potential to drive compact free-electron lasers (FELs). Even with LPA energy spreads typically at the percent level, the e-beam brightness can be excellent, due to the low normalized emittance (<0.5 μm) and high peak current (multi-kA) resulting from the ultra-short e-beam duration (few fs). It is critical, however, that in order to mitigate the effect of percent-level energy spread, one has to actively manipulate the phase-space distribution of the e-beam. We provide an overview of the methods proposed by the various LPA FEL research groups. At the BELLA Center at LBNL, we are pursuing the use of a chicane for longitudinal e-beam decompression (therefore greatly reducing the slice energy spread), in combination with short-scale-length e-beam transportation with an active plasma lens and a strong-focusing 4-m-long undulator. We present ELEGANT & GENESIS simulations on the transport and FEL gain, showing strong enhancement in output power over the incoherent background, and present estimates of the 3D gain length for deviations from the expected e-beam properties (varying e-beam lengths and emittances). To highlight the role of collective effects, we also present ELEGANT & GENESIS simulation results.

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Section: Lpa Fel Experimentsmentioning

confidence: 99%

Free-electron lasers driven by laser plasma accelerators

Tilborg

Barber

Isono

et al. 2017

AIP Conference Proceedings

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“…We propose a more efficient way to produce large-bandwidth XFEL pulses by using a transverse-gradient undulator (TGU) (Smith et al, 1979;Fuchert et al, 2012) in conjunction with a transversely tilted electron beam. In a TGU there is a linear dependence of the undulator field on the transverse position x,…”

Section: Description Of the Schemementioning

confidence: 99%

Generation of ultra-large-bandwidth X-ray free-electron-laser pulses with a transverse-gradient undulator

Prat

Calvi

Reiche

2016

J Synchrotron Radiat

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A new and simple method to generate X-ray free-electron-laser radiation with unprecedented spectral bandwidth above the 10% level is presented. The broad bandwidth is achieved by sending a transversely tilted beam through a transverse-gradient undulator. The extent of the bandwidth can easily be controlled by variation of the beam tilt or the undulator gradient. Numerical simulations confirm the validity and feasibility of this method.

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“…However, the necessary small energy spread for conventional undulators has yet to be obtained. To overcome this difficulty transverse-gradient undulators (TGU) have been investigated as a possibility to achieve a compact XFEL with currently available energy spreads of LWFA electron beams [11,3,12,13,14]. In addition, using conventional accelerator technology phase space rotation of the bunch resulting in decompressed bunches with reduced energy spread [4] and chromatic focusing [5] have also been investigated.…”

Section: Introductionmentioning

confidence: 99%