Discovery of Third Possible Ion Generating Source in 4π Plasma Focus Device Space

Area of Science:

• Plasma Physics
• Nuclear Fusion Technology

Background:

• Plasma Focus Devices (PFDs) are crucial for fusion energy research.
• Ion generation in PFDs is typically attributed to the anode and cathode assembly.
• Understanding all ion sources is vital for optimizing PFD performance.

Purpose of the Study:

• To investigate an unexpected observation of ion tracks in a PFD.
• To identify the origin of these novel ion tracks.
• To explore the possibility of a third ion generation source within the PFD.

Main Methods:

• Utilized a 4π Plasma Focus Device (PFD).
• Employed panorama mega-size cylindrical polycarbonate ion image detectors.
• Conducted experiments using hydrogen, deuterium, and helium gases.

Main Results:

• Observed dense ion tracks, termed "On Shadow Ion Tracks" (OSIT), on "ion cathode shadows" (ICS).
• These OSITs were detected on detectors placed behind cathodes, where ion presence was unexpected.
• The findings suggest ions are bombarding the detector from a source other than the primary anode and cathode assembly.

Conclusions:

• A potential third source of ion generation in PFDs has been identified.
• The discovery of OSITs challenges existing models of ion dynamics in PFDs.
• Further research is needed to fully characterize this new ion source and its implications for PFD technology.