Survey of advanced dielectric wakefield accelerators

Conde, Manoel

doi:10.1109/pac.2007.4441323

Cited by 12 publications

(23 citation statements)

References 13 publications

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“…DWAs are formed by one or several coaxial dielectric layers surrounded by a metal cladding [12]. Wakefields in dielectric structures may reach gradients on the order of 10 GV=m [14] with 100 MV=m being demonstrated in multiple experiments [15,16]. They also have the remarkable property that the wakefield's axial electric field and the transverse electric field are transversely uniform and linear, respectively.…”

Section: Introductionmentioning

confidence: 99%

Design of an emittance exchanger for production of special shapes of the electron beam current

Shchegolkov

Simakov

2014

Phys. Rev. ST Accel. Beams

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Recently, considerable attention has been focused on electron beam current profile shaping by means of a transverse beam mask followed by an emittance exchanger (EEX). This setup can transform a transverse particle distribution into a longitudinal particle distribution. We investigate the EEX technique with application to production of a double triangular drive and a trapezoidal main bunches for high transformer ratio, high brightness dielectric wakefield accelerators. We perform numerical optimization of two realistic configurations: a double dogleg and a chicane. In this paper we report sample designs and discuss the effects of the beam line nonlinearities, beam space charge, and coherent synchrotron radiation on a current profile of the output beam.

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Section: Introductionmentioning

confidence: 99%

Design of an emittance exchanger for production of special shapes of the electron beam current

Shchegolkov

Simakov

2014

Phys. Rev. ST Accel. Beams

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“…There is an ongoing program in the AWA group at Argonne National Laboratory (ANL) to develop DL acceleration. An X-band DL accelerator has been developed (Zou 2001), and Several standing-wave DLA structures have been tested under high gradients up to 100MV/m (Conde 2007). Recently lower power loss and higher acceleration efficiency multilayer DL structures were proposed (Jing 2005), and an enhanced transformer ratio was shown in a ramped bunch train test in a DLA structure …”

Section: Particle Accelerator Fundamentalsmentioning

confidence: 99%

High-power radio frequency pulse generation and extration based on wakefield excited by an intense charged particle beam in dielectric-loaded waveguides.

Gao¹

2009

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“…High frequency (20 GHz) RF power extracted from the drive beam using a low impedance dielectric structure is used to power the main linacs, which are based on high impedance high gradient dielectric loaded accelerating structures [2,3]. Dielectric structures have been shown to sustain high fields for short RF pulse lengths and can be used as RF power generation devices [3][4][5]. In this paper, we present a survey of experimental testing of microwave materials with high-current electron beams and high power microwave sources intended for use in dielectric based short pulse linear collider designs [2].…”

Section: Introductionmentioning

confidence: 99%

Low Loss Microwave Ceramic and other Microwave Dielectric Materials for Beam Physics Applications

Kanareykin

2019

Izv. vysš. učebn. zaved. Ross., Radioèlektron.

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Introduction. Relativistic, high intensity and small emittance electron bunches are the basis of a future linear collider and free electron laser projects. Drive beam generation in a wakefield structure employing for power extraction and acceleration low loss dielectrics like microwave ceramics, fused silica and Chemical Vapor Deposition (CVD) diamond were considered.Objective. We report here our experimental testing of a ceramic material with extremely low loss tangent at GHz frequency ranges allowing the realization of high efficiency wakefield acceleration. We also present Barium Strontium Titanium oxides (BST) ferroelectric material, which is a critical tuning element of the 400 MHz superconducting radiofrequency (RF) tuner developed and tested by the CERN/Euclid Techlabs collaboration. The materials discussed here also include quartz and CVD diamonds that are capable of supporting the high RF electric fields generated by electron beams or pulsed high power microwaves. These materials have been optimized or specially designed for accelerator applications.Materials and methods. The ceramic materials for accelerators, commonly used for the dielectric based accelerating structures, have to withstand high gradient accelerating fields, and prevent potential charging by electron beams. Correspondingly, the ceramic materials, fused silica and CVD diamond were tested with high power wakefield accelerating structures at Argonne Wakefield Accelerator of Argonne National Laboratory. Some of the presented here ceramic materials were tested at X-band 11.4 GHz magnicon high power source.Results. Low loss microwave ceramics, fused silica, and CVD diamonds have been considered as materials for dielectric based accelerating structures to study of the physical limitations encountered driving > 100 MV/m at microwave and ~ GV/m at THz frequencies in a dielectric based wakefield accelerator. Various ceramic compositions were high power and electron beam tested at X-band 11.4 GHz magnicon power source and Argonne Wakefield Accelerator correspondingly. Special attention was paid to the CVD diamond cylindrical Ka-band 35 GHz wakefield structure development. Finally, the dielectric based structure tuning was demonstrated by varying the permittivity of the BST ferroelectric layer by temperature changes and by applying an external direct current electric field across the ferroelectric. This allows us to control the effective dielectric constant of the composite system and therefore, to control the structure frequency during operation. The same type of ferroelectric material was used for the Ferroelectric Fast Reactive tuner (FE-FRT) development. In a world first, CERN has tested the prototype FE-FRT with a superconducting cavity, and frequency tuning has been successfully demonstrated.Conclusion. Recent results on the development and experimental testing of advanced dielectric materials for accelerator applications are presented. Low loss microwave ceramics, quartz and CVD diamond are considered. We presented our experimental results on wakefield generation in microwave frequency ranges with the dielectric based accelerating structures. Special attention was paid to the experimental results on high power testing at X-band of the externally powered dielectric based components. Finally, we present here first experimental demonstration of ferroelectric tunable microwave ceramic for accelerator application, which includes both tunable dielectric wakefield accelerating structure and ferroelectric based fast high power tuner for superconducting cavities. The experimental results presented here are critical for the advanced dielectric wakefield accelerating structures and other components development intended for the future linear collider projects.

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Survey of advanced dielectric wakefield accelerators

Cited by 12 publications

References 13 publications

Design of an emittance exchanger for production of special shapes of the electron beam current

Design of an emittance exchanger for production of special shapes of the electron beam current

High-power radio frequency pulse generation and extration based on wakefield excited by an intense charged particle beam in dielectric-loaded waveguides.

Low Loss Microwave Ceramic and other Microwave Dielectric Materials for Beam Physics Applications

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