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Portail > Offres > Offre UMR7639-JERFAU-002 - Postdoctorat H/F: Accélération d'électrons par laser et application à la diffraction d'électrons

Postdoctoral position M/F: Laser wakefield acceleration and application to electron diffraction

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : vendredi 6 août 2021

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General information

Reference : UMR7639-JERFAU-002
Workplace : PALAISEAU
Date of publication : Friday, July 16, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 September 2021
Proportion of work : Full time
Remuneration : Monthly salary before taxes 3880€
Desired level of education : PhD
Experience required : 1 to 4 years

Missions

A one-year postdoctoral research position is open at the Laboratory for Applied Optics (LOA). The proposed research is in the area of laser wakefield acceleration (LWFA), in which a femtosecond laser pulse is used to accelerate relativistic electron beams in a plasma. Although this technique is often implemented with Joule-level laser systems, the APPLI team at LOA has recently discovered a new regime: we use single-cycle (3.5fs) laser pulses at kilohertz repetition rates to produce 2-10 MeV electron beams. We have access to a unique laser system that delivers 1 TW peak power at a kHz repetition rate in a single optical cycle, allowing us to be at the forefront of high repetition rate laser-plasma acceleration. The electron beams have unique properties such as durations of only a few femtoseconds. This extremely short duration, combined with a high repetition rate and the MeV energy range, makes this electron source extremely promising for the study of materials on ultrafast timescales. Recently, our electron source has been optimized and now reaches a high level of stability that allows us to consider its application to ultrafast electron diffraction. The goal will be to probe the structural dynamics of single crystal solid samples with an unprecedented sub-10fs resolution. The postdoctoral fellow will join this ambitious program with the following missions: (i) continue the optimization and stabilization of the high repetition rate electron source, (ii) identify and solve all technical problems related to high repetition rate operation, (iii) and most importantly, contribute to the design and realization of an experimental apparatus to implement ultrafast electron diffraction using a plasma source.

Activities

The postdoctoral researcher will contribute to this research effort at several levels by :
- proposing new concepts of temporal compression of a relativistic electron beam
- performing a numerical study of electron transport in a magnetic beamline consisting of permanent solenoids and magnetic dipoles. The performances that can be achieved will be estimated in order to reach the performances required for electron diffraction.
- experimentally implementing this magnetic transport beamline and characterizing the properties of the electron beam through this line
- performing electron diffraction experiments and if possible performing a first pump-probe experiment that will allow to estimate the temporal resolution of the diffractometer

Skills

-The candidate should have a PhD in experimental physics and extensive experience in one or more of the following areas: laser-plasma interaction (ideally laser-plasma acceleration), ultrafast optics and femtosecond laser (expert).
- Experience in charged particle beam transport will also be highly appreciated (optional).
- The candidate must have experience in scientific English, in writing articles and in preparing publications for scientific journals.
- The candidate must have experience in presenting research results at international conferences.
- The candidate should be proficient in some programming languages such as Matlab, Python, LabView (or equivalent) and should be able to write small codes for data analysis or instrument control (expert).
- The candidate must be able to work in a team, interact positively with researchers at the same or more experienced level, and provide guidance to young researchers, e.g., MSc or PhD students.

Work Context

The candidate will join the APPLI group at the Laboratory of Applied Optics (LOA). LOA is a world-class laboratory specializing in the development and use of ultra-intense femtosecond lasers. The laboratory is also internationally recognized for its developments in the field of laser-plasma acceleration. In this context, the APPLI group focuses on the development of high repetition rate laser-plasma acceleration and the promotion of applications related to the study of ultrafast dynamics in condensed matter.
The nature of the work will be primarily experimental, with privileged access to the "Salle Noire" laser, a unique facility consisting of a single-cycle kHz laser system and an experimental laser-plasma accelerator. The postdoctoral researcher will take responsibility for and develop the experimental facility while conducting cutting-edge research in the field of laser-plasma acceleration. The candidate will join a team of several research engineers and PhD students.

Constraints and risks

No particular constraints. The risks are linked to the operation of the experiment: laser risk and radioprotection essentially. The laboratory is monitored by the Autorité de Sureté Nucléaire (French Nuclear Safety Authority) which ensures that the safety systems and procedures concerning radioprotection are respected.

Additional Information

N/A

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