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

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

Subject Categories:

  • Particle Accelerators

Distribution Statement:

APPROVED FOR PUBLIC RELEASE