The postdoctoral researcher will contribute to this research effort at several
levels by :
- proposing new concepts of temporal compression of a relativistic electron
- 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
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.
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
-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
- Experience in charged particle beam transport will also be highly
- 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
- 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.
Friedrich-Schiller-Universität Jena and the GSI Helmholtz Centre for Heavy Ion
fundamental research at the borderline of high-power lasers and particle
For the institute's High Intensity Laser Physics group, we are seeking to fill
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