BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Structured laser--plasma interactions at ultra-high intensities DTSTART:20220720T150000Z DTEND:20220720T170000Z DTSTAMP:20260701T075010Z UID:ff4b8bc7-c10c-4cf2-8087-612b31cbb923 SEQUENCE:2 CREATED:20220712T085047Z DESCRIPTION: Abstract Light can carry and transfer a well-defined orbital angular momentum (OAM) [1] along the propagation axis and is often called twisted light. This quality opens new research in highly non-linear (I 1022 W/cm2) laser-plasma interactions\, including magnetic field generatio n [2]\, electron/positron acceleration in laser-plasma accelerators [3]\, high orbital angular momentum harmonic generation [4]\, and direct laser a cceleration of ions [5]. However\, the full potential of twisted light int eracting with plasma is yet unexplored. We studied three novel scenarios a nalytically and through three-dimensional particle-in-cell simulations usi ng OSIRIS [6]\; enhanced proton acceleration\, the light properties in the cutoff region of plasma\, and wakefield acceleration through light with s elf-torque. The main project focused on proton acceleration. By exploiting the benefits of a high-intensity twisted light pulse impinging a double-l ayer target\, we could reduce the accelerated proton bunch divergence by a lmost an order of magnitude while maintaining its energy compared to the c onventional Gaussian method [7]. Here\, we identified that relativistic se lf-focusing in the near-critical plasma layer of the target and the light& #x27\;s OAM contents play a crucial role in improved proton acceleration. We also explored light springs and light with self-torque by combining twi sted light modes. First\, a study of the properties of a light spring in t he cutoff region of plasma has shown a similar characteristic behavior as a compressed mechanical spring [8]. Second\, we identified that a wakefiel d configuration with self-torque in the non-linear regime leads to azimuth al forces and the formation of quasi-helical electron beams [9]. Twisted l ight is still an open field in laser-plasma research and has the potential to lead to new regimes of particle acceleration\, radiation processes\, a nd eventually laser fusion research. LAST-MODIFIED:20220714T093802Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/structured-laser-plasma-in teractions-at-ultra-high-intensities/ X-ALT-DESC;FMTTYPE=text/html:

Abstract

Light can carry and transfer a well-defined or bital angular momentum (OAM) [1] along the propagation axis and is often c alled twisted light. This quality opens new research in highly non-linear (I 1022 W/cm2) laser-plasma interactions\, including magnetic field gen eration [2]\, electron/positron acceleration in laser-plasma accelerators [3]\, high orbital angular momentum harmonic generation [4]\, and direct l aser acceleration of ions [5]. However\, the full potential of twisted lig ht interacting with plasma is yet unexplored.


We studied three novel scenarios analytically and through three-dim ensional particle-in-cell simulations using OSIRIS [6]\; enhanced proton a cceleration\, the light properties in the cutoff region of plasma\, and wa kefield acceleration through light with self-torque.


The main project focused on proton acceleration. By exploiti ng the benefits of a high-intensity twisted light pulse impinging a double -layer target\, we could reduce the accelerated proton bunch divergence by almost an order of magnitude while maintaining its energy compared to the conventional Gaussian method [7]. Here\, we identified that relativistic self-focusing in the near-critical plasma layer of the target and the ligh t'\;s OAM contents play a crucial role in improved proton acceleration .


We also explored light springs and li ght with self-torque by combining twisted light modes. First\, a study of the properties of a light spring in the cutoff region of plasma has shown a similar characteristic behavior as a compressed mechanical spring [8]. S econd\, we identified that a wakefield configuration with self-torque in t he non-linear regime leads to azimuthal forces and the formation of quasi- helical electron beams [9].


Twisted lig ht is still an open field in laser-plasma research and has the potential t o lead to new regimes of particle acceleration\, radiation processes\, and eventually laser fusion research.

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