Laser wavefront analyzer for imploding plasma density and current profile measurements

Qi, N.; Prasad, R.R.; Campbell, Kelly; Coleman, P.L.; Krishnan, M.; Weber, B.V.; Stephanakis, S. J.; Mosher, D.

doi:10.1063/1.1784527

Cited by 27 publications

(17 citation statements)

References 12 publications

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“…19. In our LWA, the 100-ps, $30-mJ/pulse, 532-nm, $50-mm diameter Nd:YAG laser beam passed through and was refracted by the gas-puff plasma.…”

Section: Laser Wavefront Analyzermentioning

confidence: 99%

“…The initial gas-puff density profiles used in the present experiments were measured with Planar Laser Induced Fluorescence [14][15][16] (PLIF). A multi-frame Laser Shearing Interferometer 17,18 (LSI) and a Laser Wavefront Analyzer 19 (LWA) were used to measure the plasma density profile during the implosions. Two 2-ns gated, 4-frame extreme ultraviolet (XUV) cameras captured images of the imploding plasma.…”

Section: Introductionmentioning

confidence: 99%

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Study of gas-puff Z-pinches on COBRA

Rosenberg

Gourdain

et al. 2014

Physics of Plasmas

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Gas-puff Z-pinch experiments were conducted on the 1 MA, 200 ns pulse duration Cornell Beam Research Accelerator (COBRA) pulsed power generator in order to achieve an understanding of the dynamics and instability development in the imploding and stagnating plasma. The triplenozzle gas-puff valve, pre-ionizer, and load hardware are described. Specific diagnostics for the gas-puff experiments, including a Planar Laser Induced Fluorescence system for measuring the radial neutral density profiles along with a Laser Shearing Interferometer and Laser Wavefront Analyzer for electron density measurements, are also described. The results of a series of experiments using two annular argon (Ar) and/or neon (Ne) gas shells (puff-on-puff) with or without an on-(or near-) axis wire are presented. For all of these experiments, plenum pressures were adjusted to hold the radial mass density profile as similar as possible. Initial implosion stability studies were performed using various combinations of the heavier (Ar) and lighter (Ne) gasses. Implosions with Ne in the outer shell and Ar in the inner were more stable than the opposite arrangement. Current waveforms can be adjusted on COBRA and it was found that the particular shape of the 200 ns current pulse affected on the duration and diameter of the stagnated pinched column and the x-ray yield. V C 2014 AIP Publishing LLC. [http://dx.

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“…19. In our LWA, the 100-ps, $30-mJ/pulse, 532-nm, $50-mm diameter Nd:YAG laser beam passed through and was refracted by the gas-puff plasma.…”

Section: Laser Wavefront Analyzermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of gas-puff Z-pinches on COBRA

Rosenberg

Gourdain

et al. 2014

Physics of Plasmas

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“…Some of these open-loop applications include aberrometers for measuring aberrations in eyes [1], characterizing laser beam quality [2], optical metrology [3], atmospheric compensation [4], wafer inspection and in determining density and magnetic field profiles in plasmas [5,6]. In the case of atmospheric compensation and aberrometers, the peak-to-valley wave-fronts measured by these sensors can be quite large unless other measures are taken to reduce the focus and cylinder terms as in aberrometers through the use of a Badal optometer [7,8] and rotating cylinders [8], respectively.…”

Section: Introductionmentioning

confidence: 99%

Iterative wave-front reconstruction for open-loop metrology applications: Shack–Hartmann and shearing interferometer wave-front sensing using Fourier or Multigrid reconstructors

Baker

Moallem²

2010

Optics Communications

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“…This increases the noise in the measurement. In this paper, an alternative technique [16][17][18][19] using a wavefront sensor is demonstrated in which only one laser pulse is required. Several types of wavefront sensors are commercially available (Hartmann, Shack-Hartmann, shearing interferometer).…”

Section: Introductionmentioning

confidence: 99%

Wavefront-sensor-based electron density measurements for laser-plasma accelerators

Plateau

Matlis

Geddes

et al. 2010

Review of Scientific Instruments

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Characterization of the electron density in laser produced plasmas is presented using direct wavefront analysis of a probe laser beam. The performance of a laser-driven plasma-wakefield accelerator depends on the plasma wavelength, hence on the electron density. Density measurements using a conventional folded-wave interferometer and using a commercial wavefront sensor are compared for different regimes of the laser-plasma accelerator. It is shown that direct wavefront measurements agree with interferometric measurements and, because of the robustness of the compact commercial device, have greater phase sensitivity, straightforward analysis, improving shot-to-shot plasma-density diagnostics.

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Laser wavefront analyzer for imploding plasma density and current profile measurements

Cited by 27 publications

References 12 publications

Study of gas-puff Z-pinches on COBRA

Study of gas-puff Z-pinches on COBRA

Iterative wave-front reconstruction for open-loop metrology applications: Shack–Hartmann and shearing interferometer wave-front sensing using Fourier or Multigrid reconstructors

Wavefront-sensor-based electron density measurements for laser-plasma accelerators

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