LAL, Orsay, France
NSC/KIPT, Kharkov, Ukraine
KhNU, Kharkov, Ukraine
In different processes of relativistic electron interaction with substance and external fields, the electron loses part of its Coulomb field and becomes half-bare. Such state of electron significantly modifies the characteristics of its electromagnetic radiation during further interaction of the particle with substance. We propose to study the influence of the half-bare state of electron upon its transition radiation (TR). The existence of such influence for the case of electron undressing at its scattering was theoretically predicted. We intend to obtain the electrons in half-bare state in the result of their crossing of a conducting screen such as a TR screen. We propose to investigate the influence of the half-bare state of electron in this process upon TR generated by such electron on a downstream TR screen situated on some distance from the upstream screen which undresses the particle. Calculations are presented for the case of a 45-MeV linac and the distance between the screens in the region between 100 mm and 300 mm. The proposed experiment is expected to reveal new features of TR signal in such process comparing to previous measurements.
N.F. Shul'ga, S.V. Trofymenko, V.V. Syshchenko, JETP Lett. 93 (2011) 1.
Y. Shibata, K. Ishi, T. Tokahashi et al., Phys. Rev. E 49 (1994) 785.
LAL, Orsay, France
SOLEIL, Gif-sur-Yvette, France
SPESO is an experiment installed in the Linac of Synchrotron SOLEIL to study the Coherent Smith-Purcell radiation produced when a grating is approached from the beam. The detectors used to measure this radiation are mounted on 3-translation axis and 2 rotation axis. This allows measurements of the radiation emission map around the grating. In addition a polarizer has been added in 2016 allowing to study the two polarization components of the radiation in this map. Preliminary results of this mapping will be presented.
LAL, Orsay, France
LCP/CLIO, Orsay, Cedex, France
CLIO/ELISE/LCP, Orsay, France
We report on measurements of Coherent Smith-Purcell radiation at the CLIO Free Electron Laser. Smith-Purcell radiation is emitted when a grating is brought close from a bunch of relativistic particles. When the bunch is sufficiently short coherent radiation is emitted. This coherent radiation encodes the longitudinal form factor of the bunch and can therefore be used as a longitudinal profile monitor. With its short pulses and high charge the 45 MeV Linac of CLIO is a good location to test advanced longitudinal profile diag- nostics. The results will be compared with measurements using the RF dephasing. induced energy dispersion.
DESY, Hamburg, Germany
INFN/LNF, Frascati (Roma), Italy
The University of Liverpool, Liverpool, United Kingdom
Cockcroft Institute, Warrington, Cheshire, United Kingdom
JIHT RAS, Moscow, Russia
CNRS LPGP Univ Paris Sud, Orsay, France
Istituto Nazionale di Fisica Nucleare, Milano, Italy
Wigner Research Centre for Physics, Institute for Particle and Nuclear Physics, Budapest, Hungary
USTRAT/SUPA, Glasgow, United Kingdom
LLR, Palaiseau, France
LULI, Palaiseau, France
KIT, Karlsruhe, Germany
PhLAM/CERLA, Villeneuve d'Ascq, France
INO-CNR, Pisa, Italy
CEA/IRFU, Gif-sur-Yvette, France
FZJ, Jülich, Germany
Shanghai Jiao Tong University, Shanghai, People's Republic of China
Università di Roma II Tor Vergata, Roma, Italy
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
SOLEIL, Gif-sur-Yvette, France
ENEA C.R. Frascati, Frascati (Roma), Italy
LAL, Orsay, France
IPFN, Lisbon, Portugal
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
GSI, Darmstadt, Germany
INFN-Roma, Roma, Italy
INFN-Pisa, Pisa, Italy
CFEL, Hamburg, Germany
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
LLNL, Livermore, California, USA
CERN, Geneva, Switzerland
University of Oxford, Clarendon Laboratory, Oxford, United Kingdom
JAI, Oxford, United Kingdom
Osaka University, Graduate School of Engineering, Osaka, Japan
UCLA, Los Angeles, California, USA
HIJ, Jena, Germany
LMU, Garching, Germany
IAP/RAS, Nizhny Novgorod, Russia
ELI-BEAMS, Prague, Czech Republic
CNR/IPP, Pisa, Italy
LBNL, Berkeley, California, USA
LOA, Palaiseau, France
BNL, Upton, Long Island, New York, USA
Stony Brook University, Stony Brook, USA
TUB, Beijing, People's Republic of China
Ecole Polytechnique, Palaiseau, France
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
University of Rome La Sapienza, Rome, Italy
JAEA/Kansai, Kyoto, Japan
HZDR, Dresden, Germany
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
PhLAM/CERCLA, Villeneuve d'Ascq Cedex, France
Lund Institute of Technology (LTH), Lund University, Lund, Sweden
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
UMAN, Manchester, United Kingdom
JASRI/SPring-8, Hyogo, Japan
The Hebrew University of Jerusalem, The Racah Institute of Physics, Jerusalem, Israel
CNRS LPGP Univ Paris Sud, Orsay, France
CEA/DSM/IRFU, France
LAL, Orsay, France
CEA, Gif-sur-Yvette, France
CEA/IRFU, Gif-sur-Yvette, France
LLR, Palaiseau, France
An electron injector in the 50-200 MeV range, based on laser wakefield acceleration, is studied in the context of multi-stage laser plasma acceleration. Test experiments carried out at the UHI100 laser facility show that electron bunches in the 100 MeV range, generated by ionization-induced injection mechanism, and accelerated by laser driven wakefield in a mm-scale length plasma can be transported using a magnetic line and precisely analysed. A comparison with simulation results provides insights on electron dynamics and indicates ways to optimize the injector.
LAL, Orsay, France
BV Proto, Sévenans, France
AGS Fusion, Izernore, France
In the recent year additive fabrication (3D printing) has revolutionized mechanical engineering by allowing the quick production of mechanical components with complex shapes. So far most of these components are made in plastic and therefore can not be used in accelerator beam pipes. We have investigated samples printed using a metal 3D printer to study their behavior under vacuum. We report on our first tests showing that such samples are vacuum compatible and comparing pumping time.
LAL, Orsay, France
CLUPS, Orsay, France
CNRS LPGP Univ Paris Sud, Orsay, France
CEA, Gif-sur-Yvette, France
LCP/CLIO, Orsay, Cedex, France
The plasma acceleration project ESCULAP (ElectronS CoUrts pour L'Acc\'el\'eration Plasma) aims at studying electrons injection into a laser plasma accelerator. This requires the injection of short electron bunches generated by the photo injector PHIL (Photo injector at LAL) into a plasma wave by the high power femtosecond Laser LASERIX. As a first step we have studied how to synchronize PHIL and LASERIX. As these two machines had not been initially designed to work together, simple synchronization solutions were not available. We detail here the synchronisation scheme that we have tested and the experimental results obtained.