Accession Number:
ADA106154
Title:
Computational Study of Magnetic Dam Effects in a High Impedance Diode.
Descriptive Note:
Memorandum rept.,
Corporate Author:
NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s):
Report Date:
1981-10-14
Pagination or Media Count:
41.0
Abstract:
Computer simulations have been conducted to test the magnetic dam concept as a means for boosting the overall ion efficiency of high impedance diodes. The dam consists of a cell located immediately behind the anode foil containing a wire along its central axis which carries a current flowing in a direction opposite to that in the diode gap. The azimuthal magnetic field generated by the wire current, I sub w, reflects the electrons crossing the foil back into the A-K gap at higher radii where their space charge can enhance ion emission over relatively large areas. Significant increases in the ion current were observed for several values of I sub w but a simultaneous increase in electron current prevented gains in overall ion efficiency. Instead, only decreased impedances were observed. The cause of this phenomenon is explained and indicates solutions which could benefit a wide range of future diode designs. Author
Descriptors:
Subject Categories:
- Particle Accelerators