J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 367-370
Study of the propagation of ultra-intense laser-produced fast electrons in gas jetsD. Batani1, 2, M. Manclossi2, 1, D. Piazza1, S.D. Baton3, A. Benuzzi-Mounaix3, M. Koenig3, H. Popescu3, F. Amiranoff3, M. Rabec Le Gloahec3, C. Rousseaux4, M. Borghesi5 and C. Cecchetti5
1 Dipartimento di Fisica "G. Occhialin", Università di Milano-Bicocca, Italy
2 LOA, École Polytechnique, Palaiseau, France
3 LULI, École Polytechnique, Palaiseau, France
4 Commissariat à l'Énergie Atomique, Bruyères-le-Châtel, France
5 Queen's University Belfast, UK
We present the results of some recent experiments performed at the LULI laboratory using the 100 TW laser facility concerning the study of the propagation of fast electrons in gas targets. Novel diagnostics have been implemented including chirped shadowgraphy and proton radiography. Proton radiography images did show the presence of very strong fields in the gas probably produced by charge separation. In turn, these imply a slowing down of the fast electron cloud as it penetrates in the gas, and a strong inhibition of propagation. Indeed chirped shadowgraphy images show a strong reduction of the electron cloud velocity from the initial value close to a fraction of c.
© EDP Sciences 2006