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

Tim Ziegler; Lieselotte Obst-Huebl; Florian-Emanuel Brack; Joao Branco; Michael Bussmann; Thomas E. Cowan; Chandra B. Curry; Frederico Fiuza; Marco Garten; Maxence Gauthier; Sebastian Göde; Siegfried H. Glenzer; Axel Huebl; Arie Irman; Jongjin B. 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

doi:10.1117/12.2520762

14 May 2019 All-optical structuring of laser-driven proton beam profiles (Conference Presentation)

Tim Ziegler, Lieselotte Obst-Huebl, Florian-Emanuel Brack, Joao Branco, Michael Bussmann, Thomas E. Cowan, Chandra B. Curry, Frederico Fiuza, Marco Garten, Maxence Gauthier, Sebastian Göde, Siegfried H. Glenzer, Axel Huebl, Arie Irman, Jongjin B. 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

Author Affiliations +

Proceedings Volume 11037, Laser Acceleration of Electrons, Protons, and Ions V; 1103707 (2019) https://doi.org/10.1117/12.2520762
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic

Abstract

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.

Conference Presentation

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Tim Ziegler, Lieselotte Obst-Huebl, Florian-Emanuel Brack, Joao Branco, Michael Bussmann, Thomas E. Cowan, Chandra B. Curry, Frederico Fiuza, Marco Garten, Maxence Gauthier, Sebastian Göde, Siegfried H. Glenzer, Axel Huebl, Arie Irman, Jongjin B. Kim, Thomas Kluge, Stephan Kraft, Florian Kroll, Josefine Metzkes-Ng, Richard Pausch, Irene Prencipe, Martin Rehwald, Christian Rödel, Hans-Peter Schlenvoigt, Ulrich Schramm, and Karl Zeil "All-optical structuring of laser-driven proton beam profiles (Conference Presentation)", Proc. SPIE 11037, Laser Acceleration of Electrons, Protons, and Ions V, 1103707 (14 May 2019); https://doi.org/10.1117/12.2520762

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KEYWORDS

Pulsed laser operation

Plasma

Ionization

Collimation

Cryogenics

Hydrogen

Interferometry

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