Properties of a capillary discharge-produced argon plasma waveguide for shorter wavelength source application

Sakai, S.; Higashiguchi, Takeshi; Bobrova, N. A.; Sasorov, P. V.; Miyazawa, Jun; Yugami, Noboru; Sentoku, Y.; Kodama, R.

doi:10.1063/1.3657136

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…equilibrium was assumed. As shown by Sakai et al, 40 the assumption of LTE conditions 0.5 μs after the initiation of the discharge is reasonable. Figure 7(b) shows the resulting temperature Te for the argon-hydrogen mixture of 95% and 5%, respectively, at a pressure of 40 mbar measured in the buffer volume.…”

Section: Temperature Measurement and Diagnostic Comparisonmentioning

confidence: 68%

“…The value ΔλI describes the same quantity but with the gas regions replaced by the interpolated (dashed) curve, providing an upper bound. In an argon plasma, it was shown in simulation 40 that after around 350 μs, the radial parabolic density profile in a capillary becomes flatter. shows that the dynamic effects in the gas inlet regions are in the first 500 μs after the discharge onset but rapidly decrease thereafter.…”

Section: Articlementioning

confidence: 98%

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Combining laser interferometry and plasma spectroscopy for spatially resolved high-sensitivity plasma density measurements in discharge capillaries

Garland

Tauscher

Bohlen

et al. 2021

Review of Scientific Instruments

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Section: Temperature Measurement and Diagnostic Comparisonmentioning

confidence: 68%

Section: Articlementioning

confidence: 98%

Combining laser interferometry and plasma spectroscopy for spatially resolved high-sensitivity plasma density measurements in discharge capillaries

Garland

Tauscher

Bohlen

et al. 2021

Review of Scientific Instruments

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show abstract

“…6. In an argon plasma it was shown in simulation 38 that after around 300 µs the radial density profile in a capillary discharge source becomes approximately flat over about 80 % of the radius of the capillary (from the center, outwards) and rises steeply by a maximum factor of around 1.5 at the walls. The lower part of Fig.…”

Section: Plasma Emission Spectrometermentioning

confidence: 99%

Evolution of longitudinal plasma-density profiles in discharge capillaries for plasma wakefield accelerators

Garland,

Tauscher,

Bohlen

et al. 2020

Preprint

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Precise characterization and tailoring of the spatial and temporal evolution of plasma density within plasma sources is critical for realizing high-quality accelerated beams in plasma wakefield accelerators. The simultaneous use of two independent diagnostic techniques allowed the temporally and spatially resolved detection of plasma density with unprecedented sensitivity and enabled the characterization of the plasma temperature at local thermodynamic equilibrium in discharge capillaries. A common-path two-color laser interferometer for obtaining the average plasma density with a sensitivity of 2 × 10 15 cm −2 was developed together with a plasma emission spectrometer for analyzing spectral line broadening profiles with a resolution of 5 × 10 15 cm −3 . Both diagnostics show good agreement when applying the spectral line broadening analysis methodology of Gigosos and Cardeñoso. Measured longitudinally resolved plasma density profiles exhibit a clear temporal evolution from an initial flat-top to a Gaussian-like shape in the first microseconds as material is ejected out from the capillary, deviating from the often-desired flat-top profile. For plasma with densities of 0.5 -2.5 × 10 17 cm −3 , temperatures of 1 -7 eV were indirectly measured. These measurements pave the way for highly detailed parameter tuning in plasma sources for particle accelerators and beam optics.

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“…They allow for modification of the spot size evolution of intense particle Correspondence to: A. Gonsalves, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA. Email: ajgonsalves@lbl.gov beams and laser pulses and are thus of interest for many applications, including plasma wakefield acceleration [11][12][13][14] , high harmonic generation [15][16][17][18] , and X-ray lasing [19,20] . In this paper, we concentrate on waveguide properties that are mainly relevant for laser pulse propagation.…”

Section: Introductionmentioning

confidence: 99%

Radial density profile and stability of capillary discharge plasma waveguides of lengths up to 40 cm

Turner

Gonsalves

Bulanov

et al. 2021

High Pow Laser Sci Eng

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We measured the parameter reproducibility and radial electron density profile of capillary discharge waveguides with diameters of 650 $\mathrm{\mu} \mathrm{m}$ to 2 mm and lengths of 9 to 40 cm. To the best of the authors’ knowledge, 40 cm is the longest discharge capillary plasma waveguide to date. This length is important for $\ge$ 10 GeV electron energy gain in a single laser-driven plasma wakefield acceleration stage. Evaluation of waveguide parameter variations showed that their focusing strength was stable and reproducible to $<0.2$ % and their average on-axis plasma electron density to $<1$ %. These variations explain only a small fraction of laser-driven plasma wakefield acceleration electron bunch variations observed in experiments to date. Measurements of laser pulse centroid oscillations revealed that the radial channel profile rises faster than parabolic and is in excellent agreement with magnetohydrodynamic simulation results. We show that the effects of non-parabolic contributions on Gaussian pulse propagation were negligible when the pulse was approximately matched to the channel. However, they affected pulse propagation for a non-matched configuration in which the waveguide was used as a plasma telescope to change the focused laser pulse spot size.

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Properties of a capillary discharge-produced argon plasma waveguide for shorter wavelength source application

Cited by 6 publications

References 13 publications

Combining laser interferometry and plasma spectroscopy for spatially resolved high-sensitivity plasma density measurements in discharge capillaries

Combining laser interferometry and plasma spectroscopy for spatially resolved high-sensitivity plasma density measurements in discharge capillaries

Evolution of longitudinal plasma-density profiles in discharge capillaries for plasma wakefield accelerators

Radial density profile and stability of capillary discharge plasma waveguides of lengths up to 40 cm

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