Accession Number:

ADA636700

Title:

Angular Dose Variations from 4- to 6-MV Rod-Pinch Diode Experiments on the ASTERIX Pulsed-Power Generator

Descriptive Note:

Conference paper

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV

Report Date:

2003-06-01

Pagination or Media Count:

6.0

Abstract:

The angular distribution of radiation from a rod-pinch diode is examined with coupled PIC-Monte-Carlo simulations using the LSP code and compared with angular dose measurements on the ASTERIX pulsed-power generator. For the 4- to 6-MV voltage range accessible in the experiments, both the measured and simulated doses at 1 m were 25 to 38 rad-LiF in the forward direction 0 degree. The calculated dose at 90 degrees is 1.2-1.8 times larger than the forward-directed dose depending on both the voltage and rod diameter. This is also in agreement with the measured angular variation. At 6 MV, the simulations show that the dose near 180 degrees is more than twice the forward-directed dose. At these high voltages, electrons approach the anode rod primarily at angles close to 180 degrees resulting in peak radiation in the backward direction. This suggests that negative polarity should be considered for voltages at or above 6 MV to maximize the extracted dose. Simulations show that the 0 degree dose is higher with tapered rods and increases with rod diameter. Simulations at 10 MV show that the dose near 180 degrees is more than ten times higher than the 0 degrees dose. At 10 MV, the dose near 180 degrees at 1 m from a 2-mm diameter, blunt rod is calculated to be roughly 800 Rad LiF.

Subject Categories:

  • Electrical and Electronic Equipment
  • Operations Research
  • Test Facilities, Equipment and Methods
  • Radiofrequency Wave Propagation
  • Electromagnetic Pulses

Distribution Statement:

APPROVED FOR PUBLIC RELEASE