Modeling of High-Energy Particles and Radiation Production for Multipetawatt Laser Facilities

Table 3

Summary of the backscattered electrons and transmitted high-energy bremsstrahlung photon characteristics for various laser energies.

Laser energy (J)	200	500	1000	3500
Hot electron temperature (MeV)	1.63	3	5	7.6
Fraction of reflected electrons (%)	47.5	37.9	37.3	32.9
Temperature of reflected electrons (MeV)	1.2	2.2	3.5	4.8
Fraction of transmitted electrons (%)	0.02	0.52	2.09	5.5
Temperature of transmitted electrons (MeV)	1.8	2.8	4.5	6.5
Electron/photon conversion ration Rγ (%)	7.4	20.4	42.5	70
Maximum energy of transmitted photons Emax−γ (MeV)	25	45	64	105
Temperature of transmitted photons Tγ (MeV)	1.3	2.3	3.5	5.7

In the framework of our study of activation, the electron/photon conversion ratio R_γ is calculated assuming electron energies above 1 MeV and the temperature of transmitted photons T_γ is measured by using an exponential fit of the energy spectra of transmitted photons above 1 MeV.