The stopping power of relativistic electrons and laser-accelerated proton beams for fast ignition of DT and (DHe)-He-3 and (PB)-B-11 fuels

摘要

The understanding of basic physics of processes associated with the beam in fast ignition is very important. In this paper energy deposition of 1 MeV relativistic electrons study by calculating stopping power in (DHe)-He-3 plasma with uniform density 300 g cm(-3) and compare with DT plasma in identical condition. The results show energy deposition in (DHe)-He-3 plasma is more than DT plasma. Scattering due to of background electrons decreases the penetration depth from 0.38 to 0.24 g cm(-2) in (DHe)-He-3 plasma and from 0.51 to 0.33 g cm(-2) in DT plasma. Nuclear reaction of protons with the boron-11 nuclei (p-B-11) is the most promising of all the reactions that can be used for completely neutronless power generation in a fusion reactor. The level of radioactivity associated with concomitant and secondary reactions is negligible, while for D-T reactor 80% of the fusion power is released in neutrons and neutron yield of D-He-3 is about 5%. Note, D-He-3 reaction is neutronless, but neutrons are born as a result of D-D branch and the secondary reaction of tritium and deuterium. From a technical point of view the lack of neutrons in the reactor mixture p-B-11 is very attractive because it removes a major problem of the first wall. Therefore in this paper proton beam is proposed in fast ignition approach using (PB)-B-11 fuel at uniform density 300 g cm(-3) with considering Maxwellian energy distribution. The stopping power and total range of proton beam are calculated. The rate of energy transfer between ions and electrons and bremsstrahlung loss power with considering relativistic corrections in (PB)-B-11 fuel are exanimated. The results show that total stopping power of protons in (PB)-B-11 fuel at different temperatures is a function of proton energy and it decreases with rising temperature at constant E-p. Bonus energy and total deposited energy is significant at smallerE(p) and higher T-e. Copyright (c) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved3.