Tomographic imaging of nonsymmetric multicomponent tailored supersonic flows from structured gas nozzles

Golovin, Grigory; Banerjee, Sudeep; Zhang, J; Chen, Shouyuan; Liu, Cheng; Zhao, Baozhen; Mills, Jared; Brown, Kevin; Petersen, Chad; Umstadter, Donald

doi:10.1364/ao.54.003491

Cited by 11 publications

(10 citation statements)

References 44 publications

(44 reference statements)

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“…The nozzles were separated by 0.5-mm gap. Three-dimensional density profiles of the gas flow from the nozzle were measured offline with a Mach-Zander interferometer and reconstructed using the SIRT tomography algorithm 46 . Energy of the electron beams was controlled by the second gas jet density.…”

Section: Methodsmentioning

confidence: 99%

Intrinsic beam emittance of laser-accelerated electrons measured by x-ray spectroscopic imaging

Golovin

Banerjee

Liu

et al. 2016

Sci Rep

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The recent combination of ultra-intense lasers and laser-accelerated electron beams is enabling the development of a new generation of compact x-ray light sources, the coherence of which depends directly on electron beam emittance. Although the emittance of accelerated electron beams can be low, it can grow due to the effects of space charge during free-space propagation. Direct experimental measurement of this important property is complicated by micron-scale beam sizes, and the presence of intense fields at the location where space charge acts. Reported here is a novel, non-destructive, single-shot method that overcame this problem. It employed an intense laser probe pulse, and spectroscopic imaging of the inverse-Compton scattered x-rays, allowing measurement of an ultra-low value for the normalized transverse emittance, 0.15 (±0.06) π mm mrad, as well as study of its subsequent growth upon exiting the accelerator. The technique and results are critical for designing multi-stage laser-wakefield accelerators, and generating high-brightness, spatially coherent x-rays.

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Section: Methodsmentioning

confidence: 99%

Intrinsic beam emittance of laser-accelerated electrons measured by x-ray spectroscopic imaging

Golovin

Banerjee

Liu

et al. 2016

Sci Rep

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“…By calibrating the plasma formation and imaging system to known helium pressures, this method allows us to create spatial maps of the gas flow from an injector tip. Compared to previous methods, 26,27 this approach provides a higher sensitivity, allowing the detection of one order of magnitude lower gas pressures, and it does not rely on interferometric measurements prone to mechanical instabilities. In particular, we characterize a convergent nozzle injector 23 under typical operation conditions for XFEL single-particle diffractive imaging experiments.…”

Section: Introductionmentioning

confidence: 99%

Characterizing gas flow from aerosol particle injectors

Horke

Roth

Worbs

et al. 2017

Journal of Applied Physics

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A novel methodology for measuring gas flow from small orifices or nozzles into vacuum is presented. It utilizes a high-intensity femtosecond laser pulse to create a plasma within the gas plume produced by the nozzle, which is imaged by a microscope. Calibration of the imaging system allows for the extraction of absolute number densities. We show detection down to helium densities of 4 Â 10 16 cm À3 with a spatial resolution of a few micrometers. The technique is used to characterize the gas flow from a convergent-nozzle aerosol injector [Kirian et al., Struct. Dyn. 2, 041717 (2015)] as used in single-particle diffractive imaging experiments at free-electron laser sources. Based on the measured gas-density profile, we estimate the scattering background signal under typical operating conditions of single-particle imaging experiments and estimate that fewer than 50 photons per shot can be expected on the detector. Published by AIP Publishing.

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“…Laser pulses were focused on the rising edge of the injector jet at a height of 2 mm above the nozzle orifices. Neutral gas 3D density profiles of both individual jets and the double-jets were measured by a Mach-Zehnder interferometer and reconstructed using the SIRT tomography method [34]. Some profiles relevant to the work presented in this paper are shown in Error!…”

Section: Methodsmentioning

confidence: 99%

Control and optimization of a staged laser-wakefield accelerator

Golovin

Banerjee

Chen

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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We report results of an experimental study of laser-wakefield acceleration of electrons, using a staged device based on a double-jet gas target that enables independent injection and acceleration stages. This novel scheme is shown to produce stable, quasi-monoenergetic, and tunable electron beams. We show that optimal accelerator performance is achieved by systematic variation of five critical parameters. For the injection stage, we show that the amount of trapped charge is controlled by the gas density, composition, and laser power. For the acceleration stage, the gas density and the length of the jet are found to determine the final electron energy. This independent control over both the injection and acceleration processes enabled independent control over the charge and energy of the accelerated electron beam while preserving the quasi-monoenergetic character of the beam. We show that the charge and energy can be varied in the ranges of 2-45 pC, and 50-450 MeV, respectively. This robust and versatile electron accelerator will find application in the generation of high-brightness and controllable x-rays, and as the injector stage for more conventional devices.

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Tomographic imaging of nonsymmetric multicomponent tailored supersonic flows from structured gas nozzles

Cited by 11 publications

References 44 publications

Intrinsic beam emittance of laser-accelerated electrons measured by x-ray spectroscopic imaging

Intrinsic beam emittance of laser-accelerated electrons measured by x-ray spectroscopic imaging

Characterizing gas flow from aerosol particle injectors

Control and optimization of a staged laser-wakefield accelerator

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