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20 April 2021 Proton beam quality enhancement beyond the 60 MeV energy level by active control of temporal properties of the Draco PW laser
Karl Zeil, Constantin Bernert, Florian-Emanuel Brack, Marco Garten, Lennart Gaus, Thomas Kluge, Stephan D. Kraft, Florian Kroll, Josefine Metzkes-Ng, Thomas Pueschel, Martin Rehwald, Hans-Peter Schlenvoigt, Ulrich Schramm
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Proceedings Volume 11779, Laser Acceleration of Electrons, Protons, and Ions VI; 117790H (2021) https://doi.org/10.1117/12.2589546
Event: SPIE Optics + Optoelectronics, 2021, Online Only
Abstract
We report on experimental investigations of proton acceleration from laser-irradiated solid foils with the DRACOPW laser, where highest proton cut-off energies were achieved for temporal pulse parameters that varied significantlyfrom those of an ideally Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driverlaser by means of an acousto-optic programmable dispersive filter enabled us to manipulate the temporal shape ofthe last picoseconds around the main pulse and to study the effect on proton acceleration from thin foil targets. Theresults show that short and asymmetric pulses generated by positive third order dispersion values are favourable forproton acceleration and can lead to maximum energies of 60 MeV at 18 J laser energy for thin plastic foils, effectivelydoubling the maximum energy compared to ideally compressed FTL pulses. The talk will further prove the robustnessand applicability of this enhancement effect for the use of different target materials and thicknesses as well as laserenergy and temporal intensity contrast settings. Assuming appropriate control over the spectral phase of the laser andcomparable temporal contrast conditions, we believe that the presented method can be universally applied to improveproton acceleration performance using any other laser system, particularly important when operating in the PW regime.
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Karl Zeil, Constantin Bernert, Florian-Emanuel Brack, Marco Garten, Lennart Gaus, Thomas Kluge, Stephan D. Kraft, Florian Kroll, Josefine Metzkes-Ng, Thomas Pueschel, Martin Rehwald, Hans-Peter Schlenvoigt, and Ulrich Schramm "Proton beam quality enhancement beyond the 60 MeV energy level by active control of temporal properties of the Draco PW laser", Proc. SPIE 11779, Laser Acceleration of Electrons, Protons, and Ions VI, 117790H (20 April 2021); https://doi.org/10.1117/12.2589546
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KEYWORDS
Control systems
Fourier transforms
Laser energy
Laser irradiation
Laser systems engineering
Optical filters
Phase modulation
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