Demonstration of a high repetition rate capillary discharge waveguide

Gonsalves, A. J.; Liu, F.; Bobrova, N. A.; Sasorov, P. V.; Pieronek, C. V.; Daniëls, J.; Antipov, Sergey; Butler, James E.; Bulanov, S. S.; Waldron, W.L.; Mittelberger, D. E.; Leemans, Wim

doi:10.1063/1.4940121

Cited by 43 publications

(29 citation statements)

References 40 publications

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“…Also, MHD simulations presented in Ref. [32] indicate that current nonuniformity is minimized at lower peak current and higher fill pressures. This could imply that operating a 440 A peak discharge pulse at 200 A timing (trailing edge) is more detrimental to the emittance than using a 200 A peak discharge pulse at peak timing.…”

Section: Experimental Observationmentioning

confidence: 93%

“…Based on concepts revived from the 1950s ion accelerator community [24][25][26][27], recently Ref. [28] demonstrated that discharged plasma lenses [29][30][31][32] have the potential to be of great value to compact accelerator applications, due to tunability, high-field gradients (>3000 T=m), and radial focusing symmetry. For example, I 0 ¼ 600 A for a R ¼ 0.25 mm capillary yields a field gradient of 1800 T=m, corresponding to a focal length of 5 cm for a L ¼ 30 mm long structure and 1 GeV electrons.…”

Section: Introductionmentioning

confidence: 99%

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Nonuniform discharge currents in active plasma lenses

Tilborg

Barber

Tsai

et al. 2017

Phys. Rev. Accel. Beams

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Active plasma lenses have attracted interest in novel accelerator applications due to their ability to provide large-field-gradient (short focal length), tunable, and radially symmetric focusing for charged particle beams. However, if the discharge current is not flowing uniformly as a function of radius, one can expect a radially varying field gradient as well as potential emittance degradation. We have investigated this experimentally for a 1-mm-diameter active plasma lens. The measured near-axis field gradient is approximately 35% larger than expected for a uniform current distribution, and at overfocusing currents ring-shaped electron beams are observed. These observations are explained by simulations.

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Section: Experimental Observationmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Nonuniform discharge currents in active plasma lenses

Tilborg

Barber

Tsai

et al. 2017

Phys. Rev. Accel. Beams

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“…Investigation into the lifetime of plasma capillaries over millions of kHz-rate, high-voltage discharges has shown promising solutions that could be implemented at FLASHForward [45]. The heating of capillaries from millions of plasma ignitions and wall erosion from kHz repetition discharges have been studied.…”

Section: (C) Capillary Lifetime and Coolingmentioning

confidence: 99%

FLASHForward: plasma wakefield accelerator science for high-average-power applications

D’Arcy

Aschikhin

Bohlen

et al. 2019

Phil. Trans. R. Soc. A.

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The FLASHForward experimental facility is a high-performance test-bed for precision plasma wakefield research, aiming to accelerate high-quality electron beams to GeV-levels in a few centimetres of ionized gas. The plasma is created by ionizing gas in a gas cell either by a high-voltage discharge or a high-intensity laser pulse. The electrons to be accelerated will either be injected internally from the plasma background or externally from the FLASH superconducting RF front end. In both cases, the wakefield will be driven by electron beams provided by the FLASH gun and linac modules operating with a 10 Hz macro-pulse structure, generating 1.25 GeV, 1 nC electron bunches at up to 3 MHz micro-pulse repetition rates. At full capacity, this FLASH bunch-train structure corresponds to 30 kW of average power, orders of magnitude higher than drivers available to other state-of-the-art LWFA and PWFA experiments. This high-power functionality means FLASHForward is the only plasma wakefield facility in the world with the immediate capability to develop, explore and benchmark high-average-power plasma wakefield research essential for next-generation facilities. The operational parameters and technical highlights of the experiment are discussed, as well as the scientific goals and high-average-power outlook. This article is part of the Theo Murphy meeting issue ‘Directions in particle beam-driven plasma wakefield acceleration’.

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“…Active plasma lenses [21] (APLs) potentially offer an elegant solution with their compact size, azimuthally symmetric focusing, and high magnetic field gradients, which have been shown to exceed 3 kT/m [22]. Recent studies indicate that nonuniform current densities may form inside discharge capillary based APLs [23][24][25][26][27], leading to nonlinear magnetic field gradients and, subsequently, emittance deterioration [28,29].…”

Section: Introductionmentioning

confidence: 99%

Direct measurement of focusing fields in active plasma lenses

Röckemann

Schaper

Barber

et al. 2018

Phys. Rev. Accel. Beams

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Active plasma lenses have the potential to enable broad-ranging applications of plasmabased accelerators owing to their compact design and radially symmetric kT/m-level focusing fields, facilitating beam-quality preservation and compact beam transport. We report on the direct measurement of magnetic field gradients in active plasma lenses and demonstrate their impact on the emittance of a charged particle beam. This is made possible by the use of a well-characterized electron beam with 1.4 mm mrad normalized emittance from a conventional accelerator. Field gradients of up to 823 T/m are investigated. The observed emittance evolution is supported by numerical simulations, which suggest the potential for conservation of the core beam emittance in such a plasma lens setup.

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Demonstration of a high repetition rate capillary discharge waveguide

Cited by 43 publications

References 40 publications

Nonuniform discharge currents in active plasma lenses

Nonuniform discharge currents in active plasma lenses

FLASHForward: plasma wakefield accelerator science for high-average-power applications

Direct measurement of focusing fields in active plasma lenses

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