Tunable Subpicosecond Electron-Bunch-Train Generation Using a Transverse-To-Longitudinal Phase-Space Exchange Technique

Sun, Yipeng; Piot, P.; Johnson, A. S.; Lumpkin, A.H.; Maxwell, Timothy; Ruan, J.; Thurman‐Keup, R.

doi:10.1103/physrevlett.105.234801

Cited by 98 publications

(73 citation statements)

References 19 publications

(17 reference statements)

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“…8 and 9 cannot be explained by a scenario of a simple phase-space rotation that could reduce one or the other of the projected values. In addition, the same exchanger beam line has also been used by our team to transform a horizontal intensity modulation into a longitudinal modulation or sub-ps pulse train as reported previously [24]. This latter demonstration further validates our EEX beam line setup procedures.…”

Section: Emittance-exchange Resultssupporting

confidence: 60%

Upgrades of beam diagnostics with application to emittance-exchange experiments

Lumpkin

Johnson

Ruan

et al. 2011

Phys. Rev. ST Accel. Beams

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The possibility of using electron-beam phase-space manipulations to support a free-electron laser accelerator design optimization has motivated our research. An ongoing program demonstrating the exchange of transverse horizontal and longitudinal emittances at the Fermilab A0 photoinjector has benefited recently from the upgrade of several of the key diagnostics stations. Accurate measurements of these properties upstream and downstream of the exchanger beam line are needed. Improvements in the screen resolution term and reduced impact of the optical system's depth of focus by using YAG:Ce single crystals normal to the beam direction will be described. The requirement to measure small energy spreads (< 10 keV) in the spectrometer and the exchange process which resulted in bunch lengths less than 800 fs led to other diagnostics performance adjustments and upgrades as well. Application of these diagnostics in demonstrating the exchange of transverse (x) and longitudinal phase spaces is also reported.

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Section: Emittance-exchange Resultssupporting

confidence: 60%

Upgrades of beam diagnostics with application to emittance-exchange experiments

Lumpkin

Johnson

Ruan

et al. 2011

Phys. Rev. ST Accel. Beams

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“…A limitation common to the formation of all the proposed shapes resides in their discontinuous character which makes their experimental realization either challenging or relying on complicated beam-manipulation techniques [11,12]. In addition these shapes are often foreseen to be formed in combination with an interceptive mask [13,14] which add further challenges when combined with high-repetition-rate linacs [15].…”

Section: Introductionmentioning

confidence: 99%

Tailored electron bunches with smooth current profiles for enhanced transformer ratios in beam-driven acceleration

Lémery

Piot

2015

Phys. Rev. ST Accel. Beams

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Collinear high-gradient OðGV=mÞ beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support of TeV-scale lepton colliders or multiple-user free-electron laser facilities. To make these options viable, the high accelerating fields need to be complemented with large transformer ratios >2, a parameter characterizing the efficiency of the energy transfer between a wakefield-exciting "drive" bunch to an accelerated "witness" bunch. While several potential current distributions have been discussed, their practical realization appears challenging due to their often discontinuous nature. In this paper we propose several alternative continuously differentiable (smooth) current profiles which support enhanced transformer ratios. We especially demonstrate that one of the devised shapes can be implemented in a photo-emission electron source by properly shaping the photocathode-laser pulse. We finally discuss a possible superconducting linear-accelerator concept that could produce shaped drive bunches at high-repetition rates to drive a dielectric-wakefield accelerator with accelerating fields on the order of ∼60 MV=m and a transformer ratio ∼5 consistent with a recently proposed multiuser free-electron laser facility.

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“…The trapezoidal shape of main bunch was adjusted to achieve the maximum uniformity of the gradient witnessed by the accelerated electrons. We found that in theory, the induced energy spread in the witness bunch on axis could be made as low as The simultaneous double triangular shape of the witness bunch and the trapezoidal shape of the main bunch are now relatively easy to implement using a new accelerator optic called an Emittance EXchanger (EEX), recently proposed [16] and demonstrated [17], if we include a simple multi-slit mask [18]. The EEX optics exchanges one of the transverse planes of the electron beam (for instance the y-plane) with the longitudinal plane.…”

Section: Using Dwas For Reduction Of the Energy Spreadmentioning

confidence: 99%