Ultimate gradient in solid-state accelerators

Whittum, D.

doi:10.1063/1.58876

Cited by 8 publications

(5 citation statements)

References 55 publications

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“…THz radiation has been generated by a short ~10 GV/m pulse within a 100 μm diameter dielectric fiber [6]. The electrical and mechanical properties of diamond make it an ideal candidate material for use in dielectric RF structures: high breakdown voltage, extremely low dielectric losses and the highest thermal conductivity coefficient available for removing waste heat from the device [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Initially, a diamond based resonator loading was considered in [7]. In [8], a diamond-based rectangular DLA was discussed and all-metal and dielectric-based accelerating structures were compared. The cylindrical diamond dielectric tubes that are manufactured via a relatively simple and inexpensive CVD process, plasma assisted CVD have been considered in [5,9].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Accelerating gradients of conventional accelerators consisting of microwave-driven metal cavities are severely limited by electric breakdown and available peak power [1]. Theoretical, computational, and technological (both in microfabrication and laser technology) advances have resulted in the resurgence of interest in advanced laser-driven structure-based accelerators that have been known [2] for some time.…”

Section: Introductionmentioning

confidence: 99%

Prism-coupled surface wave accelerator based on silicon carbide

Neuner

Korobkin

Ferro

et al. 2012

Phys. Rev. ST Accel. Beams

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A compact, solid-state accelerating structure based on surface waves is proposed and experimentally characterized. The structure, consisting of two SiC layers epitaxially grown on Si slabs and separated from each other by a subwavelength acceleration channel, is shown to support both longitudinal (accelerating) and transverse (deflecting) surface modes. Both modes are experimentally excited and characterized by performing angle-resolved spectroscopy with a wavelength-tunable carbon dioxide laser. Phase velocities of superluminous and subluminous modes are experimentally demonstrated, paving the way for tabletop charged particle acceleration. The same structure can be used for optical characterization of ultrashort electron bunches that generate longitudinal and transverse Cherenkov radiation.

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“…The structure can be based either on a solid material, or on a plasma. While breakdown, single-pulse heating and the resulting cyclic stress are not important for a plasma-based structure, those issues are of the utmost importance to solid structures (Whittum 1999). Examples of the solid laser-driven structures include an open grating in an inverse Smith-Purcell accelerator (Palmer & Giordano 1985), a dielectric-loaded accelerator (Rosenzweig et al 1995), an overmoded microchannel metal waveguide (Steinhauer & Kimura 2003), or a photonic bandgap accelerator (Smith et al 1994;Shapiro et al 2001;Cowan 2003).…”

Section: Introductionmentioning

confidence: 99%

Novel techniques of laser acceleration: from structures to plasmas

Kalmykov

Polomarov

Korobkin

et al. 2006

Phil. Trans. R. Soc. A.

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Compact accelerators of the future will require enormous accelerating gradients that can only be generated using high power laser beams. Two novel techniques of laser particle acceleration are discussed. The first scheme is based on a solid-state accelerating structure powered by a short pulse CO(2) laser. The planar structure consists of two SiC films, separated by a vacuum gap, grown on Si wafers. Particle acceleration takes place inside the gap by a surface electromagnetic wave excited at the vacuum/SiC interface. Laser coupling is accomplished through the properly designed Si grating. This structure can be inexpensively manufactured using standard microfabrication techniques and can support accelerating fields well in excess of 1 GeV m(-1) without breakdown. The second scheme utilizes a laser beatwave to excite a high-amplitude plasma wave, which accelerates relativistic particles. The novel aspect of this technique is that it takes advantage of the nonlinear bi-stability of the relativistic plasma wave to drive it close to the wavebreaking.

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Ultimate gradient in solid-state accelerators

Cited by 8 publications

References 55 publications

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

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

Prism-coupled surface wave accelerator based on silicon carbide

Novel techniques of laser acceleration: from structures to plasmas

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