Description du sujet de thèse

The proposed PhD project includes the design and implementation of diagnostics to characterize the relativistic electron beam at the exit of a gas cell, in time and transverse position, for each shot. The aim is to achieve a micron precision in the transverse plane and femtosecond resolution in the longitudinal direction. Developed diagnostics will be tested during laser plasma experiments performed at ultra-intense laser facilities in France and in Europe
Contribute to the design of electron diagnostics, and implement them in experiments using gas cells, participate to experimental campaigns using intense laser facilities (100TW class up to PW depending on beamtime allocation), contribute to optimisation processes using artificial intelligence methods, analyse results, write progress reports and publications.
Skills :
General knowledge in physics, optics, electromagnetism, plasma physics
Interest for experimental physics and technical developments involving optics, lasers and electromagnetic wave interaction with matter
Programming skills for data analysis, diagnostic remote control, or automation
Capability to work in a team, while maintaining a good autonomy
Capability to communicate results and analysis, through written documents and oral presentations
Working knowledge of english langage

Contexte de travail

The proposed position is offered in the frame of the European project PACRI, aiming to advance plasma accelerator technologies. This activity is also closely linked to EuPRAXIA, which plans to create the world's first high energy plasma-based accelerator with industrial beam quality and user areas. LPGP is a partner of the PACRI and EuPRAXIA projects and contributes to define the acceleration concepts and laser plasma techniques that will be used to achieve and characterize the accelerated electron beams.
The mechanism of laser driven wakefield in plasma enables the acceleration of electrons in a short pulse laser generated plasma wave, where electrons are trapped and accelerated like a surfer catching a wave on the ocean. This advanced method has several advantages compared to conventional electrostatic technologies in vacuum. Accelerating gradients are much larger and electrons with energies of the order of 1 GeV can be achieved over plasmas a few centimeter long. It provides intense, short duration relativistic electron beams with compact devices. Numerous applications are foreseen, ranging from medical diagnostic and therapy, to high energy physics.
However, this technique is still under development. In particular, it is important to achieve improved stability and reproducibility of the electron beam characteristics. In order to use these electron beams, non destructive diagnostics permitting shot-to-shot analysis of the beam are required.
In this context, the proposed PhD project is to develop diagnostics to characterize the relativistic electron beam at the exit of the gas cell, in time and transverse position, for each shot. The aim is to achieve a micron precision in the transverse plane and femtosecond resolution in the longitudinal direction. Developed diagnostics will be tested during laser plasma experiments performed at ultra-intense laser facilities in France and in Europe.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.

Contraintes et risques

NA