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Univ. Paris-Saclay

Sujet de stage / Master 2 Internship

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Optimization of a laser-driven electron source for applications

Contact: DOBOSZ DUFRENOY Sandrine, , sandrine.dobosz@cea.fr, +33 1 69 08 63 40
The PHI group has been studying particle acceleration by high intensity laser-matter interaction, with a final objective oriented towards applications. We propose to optimize the laser-target coupling for increasing the stability of the laser-driven electron source on our UHI100 laser facility and to participate to an experimental campaign on the APOLLON (PW) laser whose goal is to use a laser-plasma accelerator to generate positrons source.
Possibility of continuation in PhD: Oui
Deadline for application:30/03/2022

Full description:
The High Intensity Physics (PHI) group of LIDYL (CEA-Orme des Merisiers) studies the interaction of high intensity lasers with matter and, in particular, the particle acceleration by laser-gas interaction.

Since twenty years now, progress in this field has been spectacular, demonstrating the possibility of accelerating up to several GeV electrons using gas targets with only a few centimeters, or even by a increased control of the sources (energy , divergence, etc.) resulting from innovative interaction schemes. These have paved the way towards applications.

In PHI group, we are interested in the strong potential that these laser-plasma accelerators for the the production of high dose rate sources in the context of radiotherapy. The first experiments carried out on our 100TW class laser, UHI100, have provided very encouraging results. Among the different ideas to work on, the high stability and reproducibility of the acceleration process are crucial points, as especially for applications. The student will participate in the implementation of solutions aimed at optimizing the laser-target coupling with the objective of using this source of particles for applications.

Strongly linked to the application of laser-plasma accelerator, the student will participate to an experimental campaign on positron generation by interaction of a laser-driven electron source with a solid target, planned on APOLLON laser facility (PW) for spring 2022. We will collaborate with team from the University of Belfast (leader), specialist in positron generation, and teams from the Saclay Plateau. The student will be responsible for analyzing part of the results of the experiment.

This work can be pursued with a thesis project where the progress made on the electron source will be fully exploited.
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