Hydrogen ion emission studies in 4π plasma focus device space. (July 2020)

• Record Type: Journal Article
• Authors: Sohrabi, Mehdi; Soltani, Zahra; Habibi, Morteza
• Is Part Of: Radiation physics and chemistry. Volume 172(2020:Jul.)
• Publication Date: 2020-07
• Subjects: Plasma focus device -- Plasma diagnostics -- Hydrogen ion emission -- Position sensitive particle detectors -- Ion image processing; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2020.108836
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: Plasma focus devices (PFD) produce copious flux of ions in particular hydrogen ions in 4π space. To achieve dense plasma pinch and then the emission of hydrogen ions at a voltage of 13 kV, experiments have been carried out at various gas pressures inside the chamber. Discharge current signals were recorded by Rogowski coil to choose only discharges with a high degree of current sheath symmetry and plasma pinch formation. Wide-angle 3D images of hydrogen ion emissions were efficiently formed for the first time in our laboratory on novel position-sensitive panorama mega-size cylindrical polycarbonate image detectors (MS-CPID) processed in self-invented panorama mega-size single-cell electrochemical etching (MS-ECE) systems. Hydrogen ion emission images are simply observed and analyzed by the unaided eyes. Near 4π wide-angle hydrogen ion image detection, iso-fluence contours, fluence on polar angle distributions, and hydrogen ion energy estimation were studied. MS-CPID/MS-ECE methods are breakthrough ion image detection art and technology for hydrogen ion plasma mechanism studies with provision of 4π position-sensitive data matrix bank. Studies confirm 4π hydrogen ion emission from "anode top" and radial ion run-aways from "anode assembly" forming "hydrogen cathode shadows" on MS-CPIDs making 4π PFD space availability evident for full-scope large-scale advanced hydrogen ion mechanism studies and applications. Highlights: 4π hydrogen ion geometry emission distributions in plasma focus device have been imaged. Panorama position-sensitive mega-size polycarbonate ion image detectors were used. Detectors were processed in novel single-cell panorama mega-size ECE chambers. Hydrogen ion images, emission rate, energy range, and iso-fluence contours were made.