Proposal of a spaceship design for laser fusion rocket (LFR) based on spin-polarized fuel
llustration: from The Works of Shusei Nagaoka, NHK
Proposal of a spaceship design for laser fusion rocket (LFR) based on spin-polarized fuel by H. Nakashima, Kyushu Univ.
We here propose a spaceship design.
Firstly, we know that by using two coil system, the thrust efficiency increases to ~80% from the one coil system of 60%, if we locate the second coil at the top of implosion/ pellet position.
The first/front coil is fixed and the second/rear coil is moved in the
z-direction, and we get the results of the thrust efficiency below. The
maximum efficiency is obtained at Z=0m, i.e. at the implosion/pellet position.
Yoshihiro Kajimura, Ryo Kawabuchi, and Hideki Nakashima, "Control techniques of thrust vector for magnetic nozzle in laser fusion rocket ," Fusion Engineering and Design 81, 23-24 (2006)Y
We adopt two coil system, and locate the second coil at the top of pellet/fusion neutron source to increase the thrust efficiency and to decrease the neutron emission towards the second coil by using the anisotropic emission of neutron(sinθ**2 dist.).
