Decreasing power losses in multilayer dielectric-loaded accelerating structures

Altmark, A.; Kanareykin, A.

doi:10.1134/s1063785008020260

Cited by 4 publications

(2 citation statements)

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“…Use of multilayered concentric dielectrics in a collinear acceleration scheme allows concentration of the excited wakefields in the central vacuum channel for particle acceleration. As a consequence, it is possible to reduce the high-frequency losses on metal walls of a surrounding waveguide [9,11], or to discard the surrounding waveguide altogether as in the design of the optical Bragg accelerator [10].…”

Section: Introductionmentioning

confidence: 99%

“…The two-channel coaxial wakefield accelerator structure that will be investigated below is one version within a class of multilayered dielectric-loaded accelerating structures in which the central region and one of the concentric layers are vacuum channels [9][10][11]. Use of multilayered concentric dielectrics in a collinear acceleration scheme allows concentration of the excited wakefields in the central vacuum channel for particle acceleration.…”

Section: Introductionmentioning

confidence: 99%

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Coaxial two-channel high-gradient dielectric wakefield accelerator

Sotnikov

Marshall

Hirshfield

2009

Phys. Rev. ST Accel. Beams

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A new scheme for a dielectric wakefield accelerator is proposed that employs a cylindrical multizone dielectric structure configured as two concentric dielectric tubes with outer and inner vacuum channels for drive and accelerated bunches. Analytical and numerical studies have been carried out for such coaxial dielectric-loaded structures (CDS) for high-gradient acceleration. An analytical theory of wakefield excitation by particle bunches in a multizone CDS has been formulated. Numerical calculations are presented for an example of a CDS using dielectric tubes with dielectric permittivity 5.7, having external diameters of 2.121 and 0.179 mm with inner diameters of 2.095 and 0.1 mm. An annular 5 GeV, 6 nC electron bunch with rms length of 0.035 mm energizes a wakefield on the structure axis having an accelerating gradient of $600 MeV=m with a transformer ratio $8:1. The period of the accelerating field is $0:33 mm. If the width of the drive bunch channel is decreased, it is possible to obtain an accelerating gradient of >1 GeV=m while keeping the transformer ratio approximately the same. Full numerical simulations using a particle-in-cell code have confirmed results of the linear theory and furthermore have shown the important influence of the quenching wave that restricts the region of the wakefield to within several periods following the drive bunch. Numerical simulations for another example have shown nearly stable transport of drive and accelerated bunches through the CDS, using a short train of drive bunches.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%