Investigating the effect of deuterium ignitor beam energy distribution function on the ignition of D/He-‎۳ ‎fuel pellet

In this research, the effect of deuterium beam energy distribution function resulting from TNSA and RPA mechanisms on the fast ignition of D/He-۳ fuel pellet has been investigated. The fuel is irradiated with a deuterium beam through a conical guide. The energy distribution function will be different in different mechanisms. Penetration depth and stopping power of ignitor beam with mono- energy, Maxwellian and Gaussian distribution of energy are calculated. Calculations show that the Maxwellian beam from TNSA mechanism, penetrates up to about ۱۰۰ μm in the fuel and the height of deposition peak is still in plasma corona. The height of the peak has also increased about ۲۵ times compared to the case where the Gaussian beam is considered. Also, the obtained results are shown that the energy deposit of the deuterium beam resulting the RPA mechanism will be completely localized and will be more concentrated in the dense fuel core.

Keywords:

Fast ignition , Stopping Power , Beam penetration depth , Energy deposition