Quantitative shadowgraphy for laser–plasma interactions

Boné, André; Lemos, Nuno; Figueira, Gonçalo; Dias, J. M.

doi:10.1088/0022-3727/49/15/155204

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…They therefore also have some of the characteristics of the wakefields themselves, as seen in simulations. In that sense, they carry information similar to that obtained from various plasma density perturbation diagnostics such as interferometry, shadowgraphy [24], and Fourier domain holography [25]. This correspondence could be established with these diagnostics, as is the plan for later experiments.…”

Section: Proton Bunch Modulation Frequencysupporting

confidence: 53%

Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients

Guzmán¹,

Muggli²,

Agnello³

et al. 2021

Phys. Rev. Accel. Beams

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We present numerical simulations and experimental results of the self-modulation of a long proton bunch in a plasma with linear density gradients along the beam path. Simulation results agree with the experimental results reported in [1]: with negative gradients, the charge of the modulated bunch is lower than with positive gradients. In addition, the bunch modulation frequency varies with gradient. Simulation results show that dephasing of the wakefields with respect to the relativistic protons along the plasma is the main cause for the loss of charge. The study of the modulation frequency reveals details about the evolution of the self-modulation process along the plasma. In particular for negative gradients, the modulation frequency across time-resolved images of the bunch indicates the position along the plasma where protons leave the wakefields. Simulations and experimental results are in excellent agreement.

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Section: Proton Bunch Modulation Frequencysupporting

confidence: 53%

Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients

Guzmán¹,

Muggli²,

Agnello³

et al. 2021

Phys. Rev. Accel. Beams

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“…Zemax is a raytracing software able to simulate the propagation of light trough different materials and geometries. Moreover, it allows to define custom objects being very attractive for scientific purposes like in [24,25]. In this work, we propose a raytracing model, based on a custom Zemax [26] dynamic-link library (DLL) which defines a waveguide starting from a parabolic plasma transverse density profile.…”

Section: Introductionmentioning

confidence: 99%

Zemax ray tracing model for plasma waveguides

Bisesto¹,

Galletti²,

Curcio³

2020

Laser Phys. Lett.

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Plasma-based waveguides are currently employed for laser wakefield acceleration to extend the focal region of laser beams. A parabolic transverse plasma density profile, suitable for laser guiding, can be established in a dielectric capillary as a consequence of a discharge in gas. In this work, we report on a new ray tracing model, based on the Zemax software, able to simulate the envelope of a laser beam propagating through a plasma waveguide. The potentialities offered by Zemax in terms of geometries and materials and the possibility to create custom objects do allow the simulation of complex and various scenarios, as for example curved plasma waveguides.

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“…There have been many efforts in the past to retrieve the quantitative information from shadowgrams, but it has only been possible, so far, in limited cases where the intensity modulations are small. This is done mainly by employing Poisson's equation solver [1,[13][14][15] or by using the diffusion equation [16] for specific cases [5,17]. The equation for small intensity modulation of shadowgraphy was also obtained by Pogany, et al [13] using phase contrast approach and Fresnel diffraction.…”

Section: Introductionmentioning

confidence: 99%

Quantitative shadowgraphy and proton radiography for large intensity modulations

Kasim¹,

Ceurvorst

Ratan

et al. 2017

Phys. Rev. E

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Shadowgraphy is a technique widely used to diagnose objects or systems in various fields in physics and engineering. In shadowgraphy, an optical beam is deflected by the object and then the intensity modulation is captured on a screen placed some distance away. However, retrieving quantitative information from the shadowgrams themselves is a challenging task because of the nonlinear nature of the process. Here, we present a method to retrieve quantitative information from shadowgrams, based on computational geometry. This process can also be applied to proton radiography for electric and magnetic field diagnosis in high-energy-density plasmas and has been benchmarked using a toroidal magnetic field as the object, among others. It is shown that the method can accurately retrieve quantitative parameters with error bars less than 10%, even when caustics are present. The method is also shown to be robust enough to process real experimental results with simple pre- and postprocessing techniques. This adds a powerful tool for research in various fields in engineering and physics for both techniques.

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Quantitative shadowgraphy for laser–plasma interactions

Cited by 11 publications

References 17 publications

Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients

Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients

Zemax ray tracing model for plasma waveguides

Quantitative shadowgraphy and proton radiography for large intensity modulations

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