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Open AccessFeature PaperArticle

Real-Time Tomography of Gas-Jets with a Wollaston Interferometer

1
Paul Scherrer Institut, 5232 Villigen, Switzerland
2
Institut für Angewandte Physik, Universität Bern, 3012 Bern, Switzerland
3
Institute of Optics and Quantum Electronics, Friedrich-Schiller-University Jena, 07743 Jena, Germany
4
Helmholtz Institute Jena, 07743 Jena, Germany
5
Intel, Universitè de Versailles Saint-Quentin-en-Yvelines 45, 78000 Versailles, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(3), 443; https://doi.org/10.3390/app8030443
Received: 7 November 2017 / Revised: 16 February 2018 / Accepted: 23 February 2018 / Published: 15 March 2018
(This article belongs to the Special Issue Laser-Driven Particle Acceleration)
A tomographic gas-density diagnostic using a Single-Beam Wollaston Interferometer able to characterize non-symmetric density distributions in gas jets is presented. A real-time tomographic algorithm is able to reconstruct three-dimensional density distributions. A Maximum Likelihood-Expectation Maximization algorithm, an iterative method with good convergence properties compared to simple back projection, is used. With the use of graphical processing units, real-time computation and high resolution are achieved. Two different gas jets are characterized: a kHz, piezo-driven jet for lower densities and a solenoid valve-based jet producing higher densities. While the first jet is used for free electron laser photon beam characterization, the second jet is used in laser wake field acceleration experiments. In this latter application, well-tailored and non-symmetric density distributions produced by a supersonic shock front generated by a razor blade inserted laterally to the gas flow, which breaks cylindrical symmetry, need to be characterized. View Full-Text
Keywords: interferometry; gas-jets; LWFA; knife-edge; shock-front; real-time interferometry; gas-jets; LWFA; knife-edge; shock-front; real-time
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Adelmann, A.; Hermann, B.; Ischebeck, R.; Kaluza, M.C.; Locans, U.; Sauerwein, N.; Tarkeshian, R. Real-Time Tomography of Gas-Jets with a Wollaston Interferometer. Appl. Sci. 2018, 8, 443.

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