Fig. 1 : On the left :MPQ-Polarization rotation angle of the
probe beam from .
On the right: LOA-Bunch length measurement from 
|The laser plasma accelerators approach offers the possibility to
produce in a compact and economical way high quality electron beams, of
interest for example for time-resolved studies on unprecedented time
scales. European scientists have contributed to pioneering developments
and maintain leadership in this field, but competition from the US and
Asia is growing rapidly. To meet these challenges, scientists from
LASERLAB-EUROPE have taken the initiative to develop a Joint Research
Activity with both theoretical and experimental tasks to investigate
laser plasma accelerators.
Fig. 2 : Single shot X ray spectra in the weakly
resonant case (a) and in the strong resonant case (b),
|Successful activities within the JRA LAPTECH have helped to define
the landscape of laser plasma accelerators by providing the theoretical
and experimental basis for the design of future accelerators capable of
delivering high brightness, ultra-short high energy electron bunches,
thus promoting a vast range of applications.
LAPTECH was composed of 7 contractors, MPQ, IST, STRATH, LIRM (CEA),
SLIC (CEA), LLC and LOA. To complete this JRA, two teams from
Dusseldorf (HHUD) and Dresden (FZD), have participated as
sub-contractors of MPQ.
A comprehensive experimental programme, closely coupled with the
theoretical one, has allowed to investigate, to demonstrate, and to
develop laser plasma accelerators. Among an impressive number of high
impact results one can
list the following results:
- MPQ, real time electron acceleration was observed by using the
Faraday rotation effect; electron bunch lengths in the few fs range
were deduced from the experimental data (Fig.1 a).
- At LOA, using Coherent Transition Radiation, 1.5 fs- 4kA bunch
length was measured in the colliding laser pulse scheme (Fig. 1 b).
This extreme peak current value is of major interest for free electron
- Intense MeV photon beams from electrons in harmonically resonant
betatron motion were measured by STRATH and IST teams at RAL, which is
of major interest for applications.
- At GoLP/IST, the Lorentz boosted frame has been implemented and has
allowed to simulate acceleration in the tens GeV range.
Fig. 3 : Boosted frame simulations with a 250 J laser. a) 3D view of
the wakefield, b) 2D central slice of the plasma density, c) electron
energy after the end of the plasma jet, from 
24 May 2013, CHARPAC Meeting, Lisbon, Portugal
29 May 2013, Laserlab Management Board Working Group Meeting, CDG Airport, Paris
13-14 June 2013, Annual meeting NAUUL - 'Operation of PW laser facilities', Jena, Germany
17-30 June 2013, 1st User Training Workshop on Biophotonics, Kosice, Slovakia
11 July 2013, INREX Meeting, Paris, France
21-23 May 2013, Fotonica 2013, Milan, Italy
23-25 May 2013, International Symposium on Photonics and Optoelectronics (SOPO 2013), Beijing, China
26-30 May 2013, 16th International Conference on Emerging Nuclear Energy Systems (ICENES), Madrid, Spain
26-28 May 2013, European Molecular Imaging Meeting – EMIM 2013, Torino, Italy
27-31 May 2013, Symposium on Laser Material Interactions for Micro- and Nano- Application, European Materials Research Society (EMRS) Spring Meeting, Strasbourg, France