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- PhD position at CNRS
Application Deadline: 26 June 2025 23:59:00 Paris time
General information
Offer title : Thesis on the development of diagnostics for relativistic electron beams accelerated by laser driven wakefield in plasma (M/F) (H/F)
Reference : UMR8578-BRICRO-006
Number of position : 1
Workplace : ORSAY
Date of publication : 05 June 2025
Type of Contract : FTC PhD student / Offer for thesis
Contract Period : 36 months
Start date of the thesis : 1 October 2025
Proportion of work : Full Time
Remuneration : 2200 gross monthly
Section(s) CN : 04 – Atoms and molecules, optics and lasers, hot plasmasDescription of the thesis topic
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 language
Work Context
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.
The position is located in a sector under the protection of scientific and technical potential (PPST), and therefore requires, in accordance with the regulations, that your arrival is authorized by the competent authority of the MESR.
- Specialized scientist at CLPU
Deadline: 05 April 2025
Job description:
The main functions associated with the job position are related to the design, modelling, construction, and commissioning of a plasma discharge capillary suitable for “wakefield” acceleration and particle manipulation. Specifically:
- Develop, within the framework of the project collaboration, a set of tools for the hydrodynamic modeling and simulation of plasmas relevant to the project, with a particular focus on the design of plasmas generated by electric discharges, in addition to utilizing existing software for these simulations.
- Analyze the fluid dynamics of “cell/capillary” gas systems and apply CFD software for simulations of neutral fluids relevant to the project.
- Model the physics of plasmas and accelerators in the relevant regimes for the project, including the kinematic description of plasmas and the use of PIC simulation codes to replicate the conditions for particle acceleration and manipulation in plasmas relevant to the project.
- Collaborate with members of the scientific area in the development of experiments associated with the project.
· Collaborate in the designs and setups of the prototypes that will be used in the campaigns, including the high- voltage electrical circuits required.
- Participate in the analysis of the obtained data, and prepare the required numerical methodology for it.
- Ensure the integrity of the data and the definition and recording of metadata that allow its use even by third parties not related to the activity.
- Development of scientific-technical documentation within the framework of the project.
- Participate in the drafting and preparation of future experimental campaigns in relation to the project’s objectives.
- Prepare and elaborate scientific publications and presentations to congresses within the framework of the project.
- Any other task for which, being qualified, may be entrusted in the scope of the project functions.
- Senior Researcher in Laser-plasma Undulator Illumination Source (LUIS) development (204) at ELI ERIC (ELI Beamlines)
Job description:
- lead research activities in plasma sources, laser-plasma interaction aiming high-quality electron beam and dedicated electron beam transport with relevant electron beam diagnostics, as well as incoherent photon beam generation
- lead the preparation, commissioning and user operation of the relevant technologies
- active role in international collaborations in the relevant fields
- record, analyse and document results for communication through publications in peer-review journals and presentations at conferences and workshops
- contribute to the supervision of PhD students and work closely with other members of the plasma accelerator community at ELI-Beamlines
Requirements:
- PhD in physics (at least 5 years of work after defence) with practical experience in plasma-source development and development of relevant plasma and electron beam diagnostics
- ability to take initiative and perform tasks independently
- ability to lead activities of PhD students
- good track record in publications and participation in international collaborations in relevant fields
- good knowledge of spoken and written English
- Postdoctoral Fellow at Paul Scherrer Institute (PSI): Instrumentation for Plasma Accelerators
Your tasks:
You will design instrumentation for a free electron laser, with a particular attention to the requirements of plasma-based accelerators. You will test this instrumentation at the EuPRAXIA test facilities, as well as SwissFEL, to assess its suitability and its resolution. You will analyze and interpret experimental data, identifying areas for improvement and optimizing instrumentation performance.You will work with our international partners to advance the development of plasma-based free electron lasers, presenting your research results at international conferences and workshops, and you will write manuscripts and contribute to publications in scientific journals.
Your profile:
We are seeking a highly qualified individual with a PhD degree in Physics or a related field, ideally with experience with free electron lasers or plasma accelerators. Additional expertise in instrumentation and diagnostics would be a significant asset.
As a skilled researcher, you possess strong data analysis capabilities, with a proven track record of publishing your research in scientific journals. Your self-motivated nature enables you to drive projects forward, while your excellent leadership skills inspire and motivate others to achieve their best.
In our collaborative and dynamic environment, the ability to work effectively with international partners is essential. As an open-minded and adaptable individual, you thrive in a multicultural setting, fostering strong relationships with colleagues and partners from diverse backgrounds.