The paper investigates a spiral geometry self-magnetically insulated ion diode with an explosive-emission cathode made from graphite. The experiments have been carried out using the TEMP-4M accelerator, with the accelerator configured to operate in double-pulse mode: the first negative pulse (300-500 ns, 100-150 kV) and the second positive pulse (150 ns, 250-300 kV). The ion beam energy density was 0.4-0.8 J/cm2 and the beam was composed of carbon ions (80%-85%) and protons. In order to increase the efficiency of ion current generation, we have developed a new diode with a spiral-shaped grounded electrode. Using this geometry, it seems possible to realize closed electron drift in a diode with self-magnetic insulation. In the spiral diode, the efficiency of accelerated ions is increased from 5%-9% (conventional self-insulated diodes) up to 30%-40%. The realization of closed electron drift in the diode increases the efficiency of C+ ion generation up to 40-50 times the Childe-Langmuir limit, which is more than 4 times higher than with other known constructions of self-magnetically insulated diodes.
ASJC Scopus subject areas
- Condensed Matter Physics