Dr. Frederico Fiuza Profile

Dr. Frederico Fiuza

at Instituto Superior Técnico

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Author

Publications (3)

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 | 7 May 2013 Paper

Theoretical studies of collisionless shocks for laser-acceleration of ions

A. Stockem, F. Fiuza, E. Boella, R. Fonseca, L. Silva, C. Joshi, W. Mori

Proceedings Volume 8779, 87790B (2013) https://doi.org/10.1117/12.2018491

KEYWORDS: Ions, Electromagnetism, Plasma, Particles, Laser applications, Magnetism, Ion beams, Acoustics, Computer simulations, Physics

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Proceedings Article | 7 May 2009 Paper

Short-wavelength magnetic structures from the plasma magnetic mode and their applications

F. Fiuza, S. F. Martins, R. A. Fonseca, L. O. Silva

Proceedings Volume 7359, 73590J (2009) https://doi.org/10.1117/12.820565

KEYWORDS: Magnetism, Plasma, Ionization, Electrons, Optical simulations, Carbon dioxide lasers, Electron beams, Photonic integrated circuits, Synchrotron radiation, Laser systems engineering

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