Periodic discharge in water flow was investigated using optic spectrometer and 1000 fps video camera with the discharge pulse up to several milliseconds long regulated by water flow speed. Copper drops were found on the cathode surface in the case of copper-tube anode. In spite of water cooling anode can reach melting point. Optic spectra were compared for several materials of electrodes. For copper electrodes it was found that anode is the main contributor of copper in discharge plasma.
The study of the ionized environment in the area surrounding PDFL has showed the presence of visible plasmoids moving in the horizontal plane. The study of traces on the X-ray film made it possible to detect a significant number of traces of an identical shape and size that look like the “birds” which were found earlier in other facilities. A preliminary analysis has been carried out for their identification, which led to a conclusion about the nature of these formations, in particular, their identity with the Dirac monopole (or similar object) having a “tail” and “wings” formed by a flow of electrons from the surroundings.
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