Blanc SIMI 4 - Sciences de l'information, de la matière et de l'ingénierie : Constituants fondamentaux de la matière, physique de la matière condensée

Towards coherent radiation produced by particule beam accelerators injected with external lasers – DYNACO

Submission summary

In accelerator-based systems, a strategy for producing coherent
radiation consists of injecting external laser pulses on a relativistic
electron bunch. The resulting shaping of the electrons (bunching)
leads to coherent emission.

Recently, such strategies have revealed a very promising potential, in
both extremes of the optical spectrum: in the terahertz and in the
VUV/soft-X domain. First Laser-induced THz radiation emissions was
obtained in 2006, and part of the ANR authors succeeded in a control
of the process, leading to the first narrowband emission in 2008, at
UVSOR (Japan) [Bielawski et al., Nature Physics, 4, 390(2008)].
Another part of the ANR team demonstrated at the same time the first
control of a VUV FEL emission using an external laser, at SCSS
(Japan) [Lambert et al., Nature Physics 4, 396 (2008)].

In the present ANR, the project is to explore in a systematic way
these strategies of creating coherent radiation, in the framework of a
PhLAM-SOLEIL collaboration, and with UVSOR and SCSS as external
partners. A main point of the strategy is to associate the
complementary skills of SOLEIL in accelerator physics (3rd generation
storage ring operation, terahertz physics including spontaneous CSR,
Free-Electron Lasers including 4th generation), and of the PhLAM
laboratory (nonlinear dynamics, laser dynamics, FEL dynamics,
laser-induced CSR in 2nd generation sources).

Three complementary types of approaches will be used. One of the tasks
will consist of modeling and analyzing the propagation, with
approaches from nonlinear optics and nonlinear dynamics. The second
task will consist of large scale quantitative simulations of the
complete equations. This latter is essential because it will produce
important data for spatiotemporal dynamics analysis, for identifying
relevant modeling questions, and to test the obtained models. All
works will be tested against experimental findings. We will use
results from the SCSS FEL, in operation since 2006, and for which a
collaboration has already begun with SOLEIL. On specific fundamental
questions on frequency conversion (harmonic generation and
rectification), we will perform experiments on the UVSOR-II storage
ring, for which there is a currently running collaboration with SOLEIL
and PhLAM. The support required for this project concerns equipment,
and manpower for the 3 years (post-doctoral positions), and travel.

Project coordination


The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.



Help of the ANR 549,999 euros
Beginning and duration of the scientific project: - 36 Months

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