Low jitter capillary discharge channels

Greenberg, B.; Levin, Michael; Pukhov, A.; Zigler, A.

doi:10.1063/1.1615671

Cited by 16 publications

(12 citation statements)

References 13 publications

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“…Although the ablative capillary is easily available, the characteristic breakdown jitter 22 of hundreds of nanoseconds that occurs during the discharge process leads to unstable discharges compared to the gasfilled capillary. Because the discharge mechanisms in both two kinds of discharge capillaries are different.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid capillary discharge waveguide for laser wakefield acceleration

Qin

Liu

et al. 2018

Physics of Plasmas

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This version is available at https://strathprints.strath.ac.uk/64760/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the A hybrid capillary discharge waveguide formed by injecting low-pressure hydrogen (< 3.8 Torr) into a pure ablative capillary is presented to supply the stable guiding for multi-GeV laser wakefield acceleration.The injected low-pressure gas only provides the seed plasma for ablative discharge breakdown, like the adsorbed gas in the inner wall of the ablative capillary. With this hybrid capillary, a stable discharge with low jitter (~ 5 ns) can be achieved in a simple way, and the plasma density inside can also be controlled in a range of ~ -within ~150 ns plasma channel temporal window.Furthermore, the hybrid capillary can also be easily extended to a longer length by adding multiple segments, and femtosecond laser pulses can be well guided both in the single and multiple segments mode.With these advantages, the hybrid capillary may provide an attractive plasma channel for multi-GeV-scale laser wakefield acceleration.

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Section: Introductionmentioning

confidence: 99%

“…The laser pulse is typically focused coaxially 22 (the axial laser ignition (ALI) method) or transversely 26 (the transverse laser ignition (TLI) method) into the capillary. In the ALI method, the focused laser is used to heat and evaporate the inner wall and the electrodes along the whole capillary.…”

Section: Introductionmentioning

confidence: 99%

Hybrid capillary discharge waveguide for laser wakefield acceleration

Qin

Liu

et al. 2018

Physics of Plasmas

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“…[1][2][3] In the conventional structure of capillary discharge, a thin exploding wire connecting the anode and cathode is exploited to lower the discharge voltage. 4 At the beginning of the capillary discharge, the wire is ignited to form an electrical explosion and yield the metal plasma in sequence.…”

Section: Introductionmentioning

confidence: 99%

Study on the characteristics of a two gap capillary discharge

et al. 2015

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The paper presents a new two-gap capillary (TGC) discharge structure. The prominent innovation is the introduction of the middle electrode, which divides the capillary into the trigger gap and the main gap. The discharge circuit of the TGC comprises the trigger circuit and the main circuit. The two circuits are used for the pre-ionization of the trigger gap and providing energy of 450 J for the main gap arc discharging, respectively. When the discharge initiates, the trigger gap is pre-ionized under high voltage pulse produced by trigger circuit, and meanwhile, the weakly ionized plasma is generated. The main circuit then maintains the expansion of the plasma, which is called soft capillary discharge. Afterwards, the main gap is shorted and discharges under a relatively low voltage. With the optimization of the circuit parameter, both the energy deposition ratio in main gap and the degree of plasma ionization are enhanced. The efficiency of the energy deposition is almost twice higher compared with that of the conventional capillary structure. The life performance test indicates that the erosion of the middle electrode and the trigger gap carbonization are the key factors that limit the life performance of the TGC. V C 2015 AIP Publishing LLC.

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“…To ignite the discharge, we used a 1.064 m, 10 ns pulse from a Nd-yttrium-aluminumgarnet laser. This laser ignition technique 15 amount of material from the inner wall of the capillary and produces seed ionization that triggers the discharge after ϳ50 ns. The energy required for reliable ignition was 10 to 15 mJ.…”

mentioning

confidence: 99%

“…This technique makes it possible to achieve very low ͑less than 10 ns͒ shot-to-shot jitter of the ignition delay. 15 The parameters of the discharge circuit and the driving voltage were typically chosen to provide a peak current of 200 A and relaxation time of 600 ns. The current rise time was measured to be about 100 ns.…”

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confidence: 99%

Longitudinal profiles of plasma parameters in a laser-ignited capillary discharge and implications for laser wakefield accelerator applications

Levin

Pukhov

Hubbard

et al. 2005

Applied Physics Letters

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The evolution of longitudinal electron density and temperature profiles in plasma channel produced by a low-current Plexiglas capillary discharge with laser ignition was investigated by spectroscopic methods. The plasma was produced by an electric discharge using a 0.5mm diameter, 15mm long Plexiglas capillary. The electron density measured in near-outlet region was found to be lower by 30%. Simulations show that this variation of the plasma density near the entrance of the capillary can pose substantial difficulties for external injection of electrons for laser wakefield accelerator applications.

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Low jitter capillary discharge channels

Cited by 16 publications

References 13 publications

Hybrid capillary discharge waveguide for laser wakefield acceleration

Hybrid capillary discharge waveguide for laser wakefield acceleration

Study on the characteristics of a two gap capillary discharge

Longitudinal profiles of plasma parameters in a laser-ignited capillary discharge and implications for laser wakefield accelerator applications

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