D(d,n) neutrons induced by ions from explosive evaporation of Taanode deuterium occluded. X-ray mode of plasma focus discharges

摘要

Summary form only given. Neutron yield, Y_n=10⁷-10⁸ was observed when PF at SRRC (Filippov-type; 0.3Torr of Ar; 50 kJ; 12 kV) was fired in the X-ray mode. Before theexperiment, the Ta anode was immersed in D₂ and due toocclusion, the atomic ratio 2(Ta):1(D) was obtained. After a few shotsin pure Ar, neutrons do appear and hold their yield during the entireexperiment. Y_n was detected with Ag-activation counters(end-off; 0° ) and Time-of-Flight, ToF, [X(E_x⩾0.2 MeV)and n(E_n=2.45 MeV)] was measured with fast plastic detectors(⩽2 ns), behind collimators aimed for the chamber roof (side-off;90° ) and Pb-shield (5 cm). Ion energy, E_D+, was definedfrom measured delay, T, between X and n signals to be: T=ToF(D⁺)+ToF(n)-ToF(X) Experiments were done for different combinationsof ion bases and neutron bases