Neutron-, ion-, and electron-energy spectra in a 1 kj plasma focus

The neutron energy spectrum (4 Torr deuterium) was determined from 30 m flight histograms. An average energy of approximately 100 +- 20 keV of the neutron producing deuterons within an assumed cone angle of approximately 40 degrees along the Z-axis was calculated by means of the target beam model. Shadow bar techniques reveal that only 10% of the neutrons are produced in the approximately 1 cm long focus. Experimental time of flight analysis confirms that the ion spectrum extends from less than 70 to greater than 400 keV. The electron spectrum in 8 Torr hydrogen follows an approximately 3 keV Boltzmann distribution, but demonstrates the presence of nonthermal > 100 keV electrons. (orig.)