Observation of High Transformer Ratio of Shaped Bunch Generated by an Emittance-Exchange Beam Line

Gao, Qiang; Ha, Gwanghui; Jing, Chunguang; Antipov, Sergey; Power, John; Conde, Manoel; Gai, W.; Chen, H.; Shi, Jiaru; Wisniewski, Eric; Doran, Darrell; Liu, W.; Whiteford, Charles; Zholents, A.; Piot, P.; Baturin, S. S.

doi:10.1103/physrevlett.120.114801

Cited by 45 publications

(40 citation statements)

References 20 publications

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“…[1]. The continued studies on structures with planar geometry are relevant as these structures are commonly used in wakefield acceleration and beam phase space manipulation experiments today [5][6][7][8] and provide a natural path forward for more advanced applications.…”

Section: Introductionmentioning

confidence: 99%

Analytical treatment of the wakefields driven by transversely shaped beams in a planar slow-wave structure

Baturin

Andonian

Rosenzweig

2018

Phys. Rev. Accel. Beams

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The suppression of transverse wakefield effects using transversely elliptical drive beams in a planar structure is studied with a simple analytical model that unveils the geometric nature of this phenomenon. By analyzing the suggested model we derive scaling laws for the amplitude of the longitudinal and transverse wake potentials as a function of the Gaussian beam ellipticity -σx/a. We explicitly show that in a wakefield accelerator application it is beneficial to use highly elliptical beams for mitigating transverse forces while maintaining the accelerating field. We consider two scaling strategies: 1) aperture scaling, where we keep a constant charge to have the same accelerating gradient as in a cylindrical structure and 2) charge scaling, where aperture is the same as in the cylindrical structure and charge is increased to match the gradient.

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Section: Introductionmentioning

confidence: 99%

Analytical treatment of the wakefields driven by transversely shaped beams in a planar slow-wave structure

Baturin

Andonian

Rosenzweig

2018

Phys. Rev. Accel. Beams

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“…In order to demonstrate the feasibility of the mapping method, we present the start-to-end simulation and the experiment results based on the high transformer ratio experiment [20] conducted at the AWA beam line. The AWA beam line is shown in Fig.…”

Section: Demonstration Of Mapping Methodsmentioning

confidence: 99%

Single-shot wakefield measurement system

Gao

Shi

Chen

et al. 2018

Phys. Rev. Accel. Beams

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A new experimental technique for the accurate measurements of wakefields is presented. Knowledge of wakefields is required for many applications ranging from the suppression of wakefields that arise from geometrical discontinuities to the enhancement of wakefields in structure and plasma based wakefield accelerators. In the past, direct measurements of wakefields were done with the drive-witness technique wherein the delay of a short witness beam trailing collinearly behind a high-charge drive beam is scanned over multiple shots and the wakefield is inferred from the energy spectrum of the witness beam. That technique is limited by shot-to-shot jitter, overlap of the drive and witness energy spectrum and the loss of all time-domain information. In this paper, we describe a new technique that overcomes these limitations by measuring the longitudinal phase space of a long witness beam and the drive beam in a single shot. We conclude by presenting experimental results to demonstrate its feasibility using a dielectric structure wakefield accelerator.

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“…Such a distribution could be further manipulated using a telescope composed of four quadrupole magnets to generate a train of short bunches along the temporal axis downstream of the EEX beamline [81]. EEX formed bunch train could possibly support the generation of THz radiation using, e.g., coherent transition radiation, or the resonant excitation of wakefields in a high-impedance structure such as a dielectric-lined waveguide [85].…”

Section: Multi-beam Acceleration To 48 Mevmentioning

confidence: 99%

Electron Beam Shaping and Its Applications

Halavanau¹

2018

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Transverse and longitudinal electron beam shaping is a crucial part of high-brightness electron accelerator operations. In this dissertation, we report on the corresponding beam dynamics research conducted at Fermilab Accelerator Science and Technology facility (FAST) and Argonne Wakefield Accelerator (AWA). We demonstrate an experimental method for spatial laser and electron beam shaping using microlens arrays (MLAs) at a photoinjector facility. Such a setup was built at AWA and resulted in transverse emittance reduction by a factor of 2. We present transverse emittance partitioning methods that were recently employed at FAST facility. A strongly coupled electron beam was generated in an axial magnetic field and accelerated in 1.3 GHz SRF cavities to 34 MeV. It was then decoupled in Round-To-Flat beam transformer and beams with emittance asymmetry ratio of 100 were generated. We introduce the new methods of measuring electron beam canonical angular momentum, beam transformer optimization and beam image analysis. We also describe a potential longitudinal space-charge amplifier setup for FAST high-energy beamline. As an outcome, a broadband partially coherent radiation in the UV range could be generated.

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Observation of High Transformer Ratio of Shaped Bunch Generated by an Emittance-Exchange Beam Line

Cited by 45 publications

References 20 publications

Analytical treatment of the wakefields driven by transversely shaped beams in a planar slow-wave structure

Analytical treatment of the wakefields driven by transversely shaped beams in a planar slow-wave structure

Single-shot wakefield measurement system

Electron Beam Shaping and Its Applications

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