Theory for wakefields in a multizone dielectric lined waveguide

Wang, Changbiao; Hirshfield, J. L.

doi:10.1103/physrevstab.9.031301

Cited by 33 publications

(51 citation statements)

References 13 publications

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“…Theoretical analyses of dielectric accelerating structures with rectangular geometries have been reported in a number of publications [23,[25][26][27][28][29][30][31]. To determine the amplitudes of individual Cherenkov radiation modes excited in a rectangular waveguide with dielectric slabs, the impedance matching technique was used in the earlier papers [23,25,26].…”

Section: Introductionmentioning

confidence: 99%

Transverse operator method for wakefields in a rectangular dielectric loaded accelerating structure

Baturin

Sheinman

Altmark

et al. 2013

Phys. Rev. ST Accel. Beams

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Cherenkov radiation generated by a relativistic electron bunch in a rectangular dielectric-loaded waveguide is analyzed under the assumption that the dielectric layers are inhomogeneous normal to the beam path. We propose a method that uses eigenfunctions of the transverse operator applied to develop a rigorous full solution for the wakefields that are generated. The dispersion equation for the structure is derived and the wakefield analysis is carried out. The formalism developed here allows the direct solution of the inhomogeneous system of Maxwell equations, an alternative analytic approach to the analysis of wakefields in contrast to the previously used impedance method for rectangular structure analysis. The formalism described here was successfully applied to the analysis of rectangular dielectric-lined structures that have been recently beam tested at the Argonne (ANL/AWA) and Brookhaven (BNL/ATF) accelerator facilities.

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Section: Introductionmentioning

confidence: 99%

Transverse operator method for wakefields in a rectangular dielectric loaded accelerating structure

Baturin

Sheinman

Altmark

et al. 2013

Phys. Rev. ST Accel. Beams

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show abstract

“…(2) when subject to the boundary conditions also admits evanescent modes with imaginary eigenfrequencies ! [25]. Since these evanescent modes are present over short distances behind the drive bunch, they do not contribute to the beam dynamics of a subsequent witness bunch.…”

Section: Wakefield Generationmentioning

confidence: 99%

“…The integration is extended over the transverse area of the dielectric structure. It is important to note that the set of eigenfunctions derived in this paper forms a complete set only when the evanescent modes with imaginary eigenfrequencies (not derived here) are also included [25].…”

Section: B Longitudinal Section Electric (Lse) Modesmentioning

confidence: 99%

“…In this paper we consider only the propagating modes with harmonic longitudinal and temporal dependencies of the form Eðx; y; z; tÞ ¼ Eðx; yÞe ið!tÀk z zÞ [14,25], where k z ¼ k:ẑ. In addition to the propagating-mode solutions, Eq.…”

Section: Wakefield Generationmentioning

confidence: 99%

“…Therefore, the design of the DLW structures must compromise between a small transverse size to maximize the intensity of the wakefield, and a longer interaction length to maximize the energy gain of the test charge. An appealing solution consists of using flat electron beams passing through slab-geometry DLWs [14,[23][24][25]. This possibility has become more attractive since the recent advances toward generating flat beams directly in photoinjectors [26,27].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three-dimensional analysis of wakefields generated by flat electron beams in planar dielectric-loaded structures

Mihalcea

Piot

Stoltz

2012

Phys. Rev. ST Accel. Beams

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An electron bunch passing through a dielectric-lined waveguide generates Č erenkov radiation that can result in a high-peak axial electric field suitable for acceleration of a subsequent bunch. Axial fields beyond gigavolt-per-meter are attainable in structures with sub-mm sizes depending on the achievement of suitable electron bunch parameters. A promising configuration consists of using a planar dielectric structure driven by flat electron bunches. In this paper we present a three-dimensional analysis of wakefields produced by flat beams in planar dielectric structures thereby extending the work of Tremaine, Rosenzweig, and Schoessow, Phys. Rev. E 56, 7204 (1997)] on the topic. We especially provide closed-form expressions for the normal frequencies and field amplitudes of the excited modes and benchmark these analytical results with finite-difference time-domain particle-in-cell numerical simulations. Finally, we implement a semianalytical algorithm into a popular particle-tracking program thereby enabling start-to-end high-fidelity modeling of linear accelerators based on dielectric-lined planar waveguides.

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High Emittance Electron Beam Source Coupled to Slab Loaded Accelerating Structure

Zafar

Masood³

et al. 2008

Int J Infrared Milli Waves

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High power line source emitter assembly was coupled to a twin symmetric Hplane slab loaded accelerating structure for beam acceleration. Closed form field analysis of the accelerating structure that includes guideline information regarding modal hierarchy, mode nomenclature, propagation plane, cut-off plane and dispersion relations is presented. Furthermore it was confirmed that by using symmetrically loaded dielectric accelerating structures with one rotated through 90°results in exerting a uniform acceleration impact on a travelling beam passing through the structure.

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Theory for wakefields in a multizone dielectric lined waveguide

Cited by 33 publications

References 13 publications

Transverse operator method for wakefields in a rectangular dielectric loaded accelerating structure

Transverse operator method for wakefields in a rectangular dielectric loaded accelerating structure

Three-dimensional analysis of wakefields generated by flat electron beams in planar dielectric-loaded structures

High Emittance Electron Beam Source Coupled to Slab Loaded Accelerating Structure

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