Planar-Dielectric-Wakefield Accelerator Structure Using Bragg-Reflector Boundaries

Andonian, G.; Williams, O.; Barber, Sam; Bruhwiler, David L.; Favier, Pierre; Fedurin, M.; Fitzmorris, K.; Fukasawa, Atsushi; Hoang, P. D.; Kusche, K.; Naranjo, Brian; O’Shea, Brendan; Stoltz, Peter; Swinson, C.; Valloni, Alessandra; Rosenzweig, James

doi:10.1103/physrevlett.113.264801

Cited by 27 publications

(17 citation statements)

References 26 publications

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“…First we consider equation for the longitudinal as given by Eq. (18) and rewrite it in the following form for the point x = 0, where function W (x) has maximum…”

Section: Discussionmentioning

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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“…First we consider equation for the longitudinal as given by Eq. (18) and rewrite it in the following form for the point x = 0, where function W (x) has maximum…”

Section: Discussionmentioning

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 use of elliptical beams in planar DWA structures as a method of suppressing transverse forces has been investigated analytically by direct solution to Maxwell's equations with appropriate boundary conditions [8], in detailed simulations [9,10], and using conformal mapping of Green's function solutions [11]. In previous experimental work, DWAs in planar geometries have been studied in the context of acceleration at moderate energy [12,13], and spectral decomposition in woodpile [14] and Bragg-reflector [15] configurations. However, the low charge density and resultant gradients present in these experiments prevented the observation of transverse effects to appreciably measurable levels.…”

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confidence: 99%

Suppression of Deflecting Forces in Planar-Symmetric Dielectric Wakefield Accelerating Structures with Elliptical Bunches

et al. 2020

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Wakefield based accelerators capable of accelerating gradients two orders of magnitude higher than present accelerators offer a path to compact high energy physics instruments and light sources. However, for high gradient accelerators, beam instabilities driven by commensurately high transverse wakefields limit beam quality. It has been previously theoretically shown that transverse wakefields can be reduced by elliptically shaping the transverse sizes of beams in dielectric structures with planar symmetry. We report here experimental measurements that demonstrate reduced transverse wakefields for elliptical beams in planar symmetric structures which are consistent with theoretical models. These results may enable the design of gigavolt-per-meter gradient wakefield based accelerators that produce and stably accelerate high quality beams.

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“…These issues include: extension of the interaction to longer structures and larger relative energy gains; excitation of HEM dipole modes in high-gradient structures and related transverse stability of driver and witness bunches in long DWAs 26 (see Methods); experimental exploitation of CCR-derived THz; and clarification of the microscopic mechanism behind the wakefield dissipation and its implications for multi-bunch DWA operation, to name but a few. Beyond these next steps, there lay numerous avenues for development of new types of DWA structures based on dramatically different geometries, photonic mode confinement 27 and novel materials. Such innovations may help pave the way to application of this promising GeV m −1 accelerator across a broad swath of science.…”

Section: Discussionmentioning

confidence: 99%

Observation of acceleration and deceleration in gigaelectron-volt-per-metre gradient dielectric wakefield accelerators

et al. 2016

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There is urgent need to develop new acceleration techniques capable of exceeding gigaelectron-volt-per-metre (GeV m−1) gradients in order to enable future generations of both light sources and high-energy physics experiments. To address this need, short wavelength accelerators based on wakefields, where an intense relativistic electron beam radiates the demanded fields directly into the accelerator structure or medium, are currently under intense investigation. One such wakefield based accelerator, the dielectric wakefield accelerator, uses a dielectric lined-waveguide to support a wakefield used for acceleration. Here we show gradients of 1.347±0.020 GeV m−1 using a dielectric wakefield accelerator of 15 cm length, with sub-millimetre transverse aperture, by measuring changes of the kinetic state of relativistic electron beams. We follow this measurement by demonstrating accelerating gradients of 320±17 MeV m−1. Both measurements improve on previous measurements by and order of magnitude and show promise for dielectric wakefield accelerators as sources of high-energy electrons.

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Planar-Dielectric-Wakefield Accelerator Structure Using Bragg-Reflector Boundaries

Cited by 27 publications

References 26 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

Suppression of Deflecting Forces in Planar-Symmetric Dielectric Wakefield Accelerating Structures with Elliptical Bunches

Observation of acceleration and deceleration in gigaelectron-volt-per-metre gradient dielectric wakefield accelerators

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