7 May 2013 High energy electrons from interaction with a 10 mm gas-jet at FLAME
Author Affiliations +
In this paper we discuss the spectra of the electrons produced in the laser-plasma acceleration experiment at FLAME. Here a <30 fs laser pulse is focused via an f/10 parabola in a focal spot of 10 μm diameter into a 1.2 mm by 10 mm rectangular Helium gas-jets at a backing pressure ranging from 5 to 15 bar. The intensity achieved exceeds 1019 Wcm −2. In our experiment the laser is set to propagate in the gas-jet along the longitudinal axis to use the 10 mm gas-jet length and to evaluate the role of density gradients. The propagation of the laser pulse in the gas is monitored by means of a Thomson scattering optical imaging. Accelerated electrons are set to propagate for 47,5 cm before being detected by a scintillating screen to evaluate bunch divergence and pointing. Alternatively, electrons are set to propagate in the field of a magnetic dipole before reaching the scintillating screen in order to evaluate their energy spectrum. Our experimental data show highly collimated bunches (<1 mrad) with a relatively stable pointing direction (<10 mrad). Typical bunch electron energy ranges between 50 and 200 MeV with occasional exceptional events of higher energy up to 1GeV.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. M. Grittani, G. M. Grittani, M. P. Anania, M. P. Anania, G. Gatti, G. Gatti, D. Giulietti, D. Giulietti, M. Kando, M. Kando, M. Krus, M. Krus, L. Labate, L. Labate, T. Levato, T. Levato, Y. Oishi, Y. Oishi, F. Rossi, F. Rossi, L. A. Gizzi, L. A. Gizzi, } "High energy electrons from interaction with a 10 mm gas-jet at FLAME", Proc. SPIE 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III, 87791B (7 May 2013); doi: 10.1117/12.2027030; https://doi.org/10.1117/12.2027030


Back to Top