Soft Fusion Energy Path: Isotope Production in Energy Subcritical/Economy Hypercritical D$+$D Colliding-Beam Mini Fusion Reactor `Exyder'

Bethe$^{\mathrm{1}}$ and Sakharov$^{\mathrm{2}}$ argued for soft fusion energy path \underline {via} isotope production, substantiated by Manheimer$^{\mathrm{3}}$. - Copious T and $^{\mathrm{3}}$He production$^{\mathrm{4,\thinspace 5}}$ from D(d, p) T and D(d, n) $^{\mathrm{3}}$He reactions in 725 KeV D$+$D colliding beams was measured in weak-focusing Self-Collider$^{\mathrm{6,\thinspace 7}}$ radius 0.15 m, in B $=$ 3.12 T, non-linearly stabilized by electron cloud oscillations$^{8}$ to confinement time $=$ 24 s. Simulations$^{\mathrm{6}}$ predict that by switching to strong focusing$^{\mathrm{9}}$, 10 deuterons 0.75 MeV each, generate 1 $^{\mathrm{3}}$He $+$1T $+$1p $+$ 1n at total input energy cost 10.72 MeV. Economic value of T and $^{\mathrm{3}}$He is 65 and 120 MeV/atom, respectively. We obtain economic gain 205MeV/10.72 MeV $\sim$ 2,000{\%} i.e. $^{\mathrm{3}}$He production funds cost of T. If first wall is made of Thorium n's will breed $^{\mathrm{233}}$U releasing 200 MeV/fission, at neutron cost 5.36 MeV \textit{versus} 160 MeV in beam on target, resulting in no cost $^{\mathrm{3}}$He production, valued {\$}75K/g. 1. Physics Today, May 1979, p.44; 2. Memoirs, Vintage Books, (1992); 3. Phys. Today, May 2012 p. 12; 4. Phys. Rev. Lett. \textbf{54}, 796 (1985); 5. Bull. APS, \textbf{57}, No. 3 (2012); 6. Part. Acc.1, (1970); 7. ANEUTRONIC FUSION NIM \textbf{A 271} 1-167 (1988); 8. Phys. Rev. Lett. \textbf{70}, 1818 (1993); 9. Part. Acc. \textbf{34}, 13 (1990).