Hi Steve,
At their curent locations, one detector gets 2.2X10^9 neutrons per bubbble and the other half that. Our best shots so far are at 1.5 x10^11 neutrons per shot. The wall-plug effiency is 1/250,000 at best.
This experimental device is not meant for rapid pulsing. A generator would pulse at about 500 Hz.
