Dr. Arie Irman Profile

Dr. Arie Irman

at Helmholtz-Zentrum Dresden-Rossendorf eV

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Author

Publications (5)

Proceedings Article | 8 June 2023 Presentation + Paper

The COXINEL seeded free electron laser driven by the HZDR laser plasma acceleration

Amin Ghaith, Marie Labat, Eléonore Roussel, Maxwell LaBerge, Alexandre Loulergue, Mathieu Valléau, Susanne Schöbel, Yen-Yu Chang, Patrick Ufer, Marie-Emmanuelle Couprie, Ulrich Schramm, Arie Irman

Proceedings Volume 12583, 1258306 (2023) https://doi.org/10.1117/12.2669426

KEYWORDS: Free electron lasers, Electron beams, Plasma, Spectroscopy, Ultraviolet radiation, Simulations, Streak cameras, Pulsed laser operation, Imaging systems, Beam divergence

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Proceedings Article | 18 April 2021 Presentation + Paper

Coherent-transition-radiation-based reconstruction of laser plasma accelerated electron bunches

Maxwell LaBerge, Omid Zarini, Alex Lumpkin, Alexander Debus, Andrea Hannasch, Jurjen Couperus Cabadağ, Brant Bowers, Alexander Koehler, Rafal Zgadzaj, Ulrich Schramm, Arie Irman, Michael Downer

Proceedings Volume 11779, 117790E (2021) https://doi.org/10.1117/12.2592306

KEYWORDS: Plasma, Spectroscopy, Beam shaping, 3D image reconstruction, 3D image processing, Near ultraviolet, Interferometry, Infrared spectroscopy, Infrared imaging, Image filtering

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Proceedings Article | 14 May 2019 Presentation

All-optical structuring of laser-driven proton beam profiles (Conference Presentation)

Tim Ziegler, Lieselotte Obst-Huebl, Florian-Emanuel Brack, Joao Branco, Michael Bussmann, Thomas Cowan, Chandra Curry, Frederico Fiuza, Marco Garten, Maxence Gauthier, Sebastian Göde, Siegfried Glenzer, Axel Huebl, Arie Irman, Jongjin Kim, Thomas Kluge, Stephan Kraft, Florian Kroll, Josefine Metzkes-Ng, Richard Pausch, Irene Prencipe, Martin Rehwald, Christian Rödel, Hans-Peter Schlenvoigt, Ulrich Schramm, Karl Zeil

Proceedings Volume 11037, 1103707 (2019) https://doi.org/10.1117/12.2520762

KEYWORDS: Pulsed laser operation, Plasma, Ionization, Laser beam propagation, Cryogenics, Hydrogen, Mirrors, Laser interferometry, Interferometry, Collimation

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Extreme field gradients intrinsic to relativistic laser plasma interactions enable compact MeV proton accelerators with unique bunch characteristics. Yet, direct control of the proton beam profile is usually not possible. So far, only complex micro-engineering of the relativistic plasma accelerator itself and limited adoption of conventional beam optics provided access to global beam parameters that define propagation. We present a novel, counter-intuitive all-optical approach to imprint detailed spatial information from the driving laser pulse to the proton bunch. The concept was motivated by an effect initially observed in an experiment dedicated to laser-driven proton acceleration from a renewable micrometer sized cryogenic Hydrogen jet target at the 150 TW Draco laser at HZDR. A compact, recollimating single plasma mirror was used to enhance the temporal laser contrast, which could be monitored on a single-shot base by means of self-referenced spectral interferometry with extended time excursion (SRSI-ETE) at unprecedented dynamic and temporal range. Unexpectedly, the accelerated proton beam profile showed in this experiment prominent features of the collimated laser beam, such as the shadow of obstacles inserted deliberately in the beam. In a series of further experiments, the spatial profile of the energetic proton bunch was found to exhibit identical features as the fraction of the laser pulse passing around a target of limited size. The formation of quasi-static electric fields in the beam path by ionization of residual gas in the experimental chamber results in asynchronous information transfer between the laser pulse and the naturally delayed proton bunch. Such information transfer between the laser pulse and the naturally delayed proton bunch is attributed to the formation of quasi-static electric fields in the beam path by ionization of residual gas. Essentially acting as a programmable memory, these fields provide access to a new level of proton beam manipulation.

Proceedings Article | 29 June 2017 Presentation

Simulate what is measured: next steps towards predictive simulations (Conference Presentation)

Michael Bussmann, Thomas Kluge, Alexander Debus, Axel Hübl, Marco Garten, Malte Zacharias, Jan Vorberger, Richard Pausch, René Widera, Ulrich Schramm, Thomas Cowan, Arie Irman, Karl Zeil, Dominik Kraus

Proceedings Volume 10241, 102410A (2017) https://doi.org/10.1117/12.2270897

KEYWORDS: Computer simulations, Optical simulations, Radiation effects, Plasma, Laser-matter interactions, Computer architecture, Maxwell's equations, Physical phenomena, Error analysis, Current controlled current source

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Proceedings Article | 21 June 2017 Presentation

Investigation of electron dynamics in an ionization-injection laser-wakefield accelerator via betatron radiation (Conference Presentation)

Alexander Koehler, Jurjen Couperus, Omid Zarini, Richard Pausch, Jakob Krämer, Alexander Debus, Michael Bussmann, Arie Irman, Ulrich Schramm

Proceedings Volume 10234, 1023403 (2017) https://doi.org/10.1117/12.2265029

KEYWORDS: Plasma, X-rays, Photons, Nonlinear dynamics, Hard x-rays, Diagnostics, Ionization, Sapphire lasers, Pulsed laser operation, Laser energy

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The injection process of electrons into the plasma cavity in laser-wakefield accelerators is a nonlinear process that strongly influences the property of the accelerated electrons. During the acceleration electrons perform transverse (betatron) oscillations around the axis. This results in the emission of hard x-ray radiation (betatron radiation) whose characteristics depend directly on the dynamic of the accelerated electrons. Thus, betatron radiation can be utilized as a powerful diagnostic tool to investigate the acceleration process inside the wakefield. Here we describe our recent LWFA experiments deploying ionization induced injection technique carried out with the Draco Ti:Sapphire laser. We focused 30 fs short pulses down to a FWHM spot size of 19 μm resulting in a normalized vacuum laser intensity a0 = 3.3 on a gas target. The target, which was a supersonic gas jet, provided a flat plasma profile of 3mm length. By varying the plasma density from 2x10^18 cm^-3 to 5x10^18 cm^-3 and the laser pulse energy from 1.6 J to 3.4 J we were able to tune the electron bunch and betatron parameters. Electron spectra were obtained by acquiring an energy resolved and charge calibrated electron profile after detection from the beam axis by a permanent magnetic dipole. Simultaneously, a back-illuminated and deep-depleted CCD placed on axis recorded the emitted x-ray photons with energies up to 20keV. Equipped with an 2D spectroscopy technique based on single pixel absorption events, we reconstructed the corresponding energy resolved x-ray spectrum for every shot and deduced the betatron source size at the plasma exit. Combining the data of the electron and betatron spectrum, we compare the characteristics of the betatron spectra for different electron bunches. In our experiments we recorded a total number of 25x10^4 photons per shot within a divergence angle of 1 mrad and betatron radii in the order of 1 μm. Finally, we compare our results with simulated spectra from the parallel classical radiation calculator Clara2 that is based on the Liénard-Wiechert potentials.

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