The proton beam intensity at the source as a function of the preplasma density gradient scale length. Solid line—an approximation of the results of PIC simulations (points); dashed line—the result of calculations using the momentum-conservation model. See the text for details.
Angular distributions of the proton beam intensity obtained from (a) IC measurements, (b) simulations, and (c), (d) RCF. For the simulation, , , and a hydrogen plasma of , and the peak density of 10 was assumed. The RCF records concern protons of .
The (a) proton beam power and (b) intensity at the source as a function of laser intensity. Points with error bars—the results of IC measurements; lines—the results of approximation by a power function. Points without error bars—the results of PIC simulations, in which a super-Gaussian 0.35 ps laser pulse interacted with an inhomogeneous hydrogen plasma layer of the density profile shown in Fig. 1 with .
A comparison of the proton beam intensity at the source and the laser-protons energy conversion efficiency for Au/PS and PS targets. .
Laser-protons energy conversion efficiency as a function of laser intensity for PS and Au/PS targets. Points—the results of IC measurements; lines—the results of approximation by a power function.
A comparison of the proton energy spectrum in the high-energy range for Au/PS and PS targets. Points—the results of SSTD measurements; lines—the results of approximation by the Maxwellian energy distribution with the temperature .
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