To start out, noble gas clusters including Xenon clusters are formed when these noble gases are pre-ionized by RF radiation.
The main design goal in the Papp reaction is to produce UV and X-rays.
To do this, Papp used enhanced isotopic nuclear radiation to produce X-rays catalyzed by a high voltage spark discharge; however his spark was relatively weak in terms of current.
But a strong enough high current spark discharge can generate this level and kind of EMF.
It has been recently discovered that noble gas clusters will explode when exposed to high intensity EMF in the UV and X-ray range.
Xenon clusters that range in size up to about 14 000-atoms will explode yielding extremely energetic ions with energies up to 1 MeV.
By contrast, a chemical explosion involves chemical transition energies of only some tens of electron volts.
An explosion of noble gases can far surpass in power of what a chemical explosive can deliver.
The explosion of noble gas clusters including xenon clusters initiated by strong emf in the ultraviolet and the X-ray range provides an explanation of where all that power and all those electrons produced by the Papp engine come from.
See for background the following:
http://phys.org/news/2012-11-ionization-x-ray-laser-shells-electron.htmland
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&cad=rja&ved=0CDcQFjAA&url=http%3A%2F%2Fwww.ph.utexas.edu%2F~tditmire%2Fpapers%2FTD52.pdf&ei=LE_uUNugKKSO0QHmioD4BA&usg=AFQjCNFrmkiKaJ9p1moAlkahUj93xAt8lg&sig2=tpV_wTT2bWLGsM7NQjMA_Q&bvm=bv.1357700187,d.dmQ
How do we make x-rays in the Papp reaction?
A theory of the magnetic field diffusion is developed in order to explain high-energy x-ray emission observed in vacuum spark plasmas. The acceleration mechanism is based on the intense induced electric field due to an abrupt inductance change when the plasma column expands from its pinch radius to a large radius. According to this magnetic field diffusion model, high-energy electrons are well collimated at the axis. In addition, the electron energy in this collimated flux can be easily more than 20 times the electrode voltage, which generates high-energy x-ray radiation by interaction with the dense plasma.
A 1-kJ vacuum-spark device has been developed as a pulsed X-ray source for applications in the field of microlithography, microscopy, flash radiography, etc.
The optimization works for the pulsed soft-X-ray emission are presented. The optimization was made in two steps: 1) X-ray emission maximization and 2) X-ray emission reproducibility. For the X-ray emission maximization, the changed parameters were the main capacitor energy, the anode-cathode geometry, the anode material, and the trigger pulse amplitude.
The best combination is
1 kJ for the main capacitor energy, a
conical shape for the anode,
6-12 mm anode-cathode separation,
iron for the anode material, and 14-15 kV for the trigger pulse amplitude. In these conditions, energies of up to 10 J per pulse are obtained in the 3-40 keV range for the X-ray pulses. In order to have a good reproducibility,
a high-power, very fast, high-voltage trigger pulse is required. To fulfill these conditions, a pulse transformer and an air spark gap were added to the initial triggering device (a magnetic pulse compression circuit). With the new trigger pulse (20 J per pulse, 50-ns rise-time, 22-kV amplitude in an open circuit), an acceptable X-ray emission reproducibility was obtained
The take away: success is all in the way you all build your spark.