Laser generated 300 keV electron beams from water

作者：Uhlig Jens^*; Wahlstrom Claes Goran; Walczak Monika; Sundstrom Villy; Fullagar Wilfred

来源：Laser and Particle Beams, 2011, 29(4): 415-424.

DOI：10.1017/S0263034611000516

• Fast electrons
• Laser-plasma wakefield acceleration
• Multi-pulse structure
• Plasma source
• Table top X-ray source

300 keV electron beams with energy peaked in the range 280-390 keV were generated by focusing a high contrast ratio but temporally double pulsed 800 nm ultrafast laser onto a flowing water jet under both helium atmosphere at ambient pressure and water aspirator vacuum conditions, using laser intensities in the range 10(15)-10(18) Wcm(-2). Their characteristics have been investigated as functions of inter-pulse delay, incidence geometry and laser pulse chirp. Shot-to-shot variation of the beams' equatorial and azimuthal distributions was also recorded in real time. Measurements of the emitted charge and energy have been performed. Secondary X-ray emission arising from impingement of the electron beams on the target chamber walls and other parts of the apparatus have been identified. Preliminary results after transition to a high repetition rate laser system have shown similar behavior. Approaches for improvements and applications are suggested.

• 出版日期2011-12