Laser Acceleration of Protons from Thin Film TargetsDonald Umstadter Publications
Date of this Version11-20-2001
AbstractA collimated beam of fast protons, with energies as high as 10 MeV and total number of 109, confined in a cone angle of 40°±10° has been observed when a 10 TW laser with frequencies either ω0 (corresponding to 1 μm) or 2ω0 was focused to an intensity of a few times 1018 W/cm2 on the surface of a thin film target. The protons, which originate from impurities on the front side of the target, are accelerated over a region extending into the target and exit out the backside in a direction normal to the target surface. Acceleration field gradients of ~10 GeV/cm are inferred. The maximum proton energy for 2ω0 can be explained by the charge-separation electrostatic-field acceleration due to "vacuum heating." In other set of experiments when a deuterated polystyrene layer was deposited on a surface of a Mylar film and a 10B sample was placed behind the target, we observed the production of ~105 atoms of positron active isotope 11C from the nuclear reaction 10B(d,n) 11C.
Citation InformationK. Flippo, Sudeep Banerjee, V. Yu. Bychenkov, S. Gu, et al.. "Laser Acceleration of Protons from Thin Film Targets" (2001)
Available at: http://works.bepress.com/donald_umstadter/36/