Accession Number:

ADA636513

Title:

Radiographic Results for the Rod-Pinch Diode Scaled Up to 6 MV

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 rod-pinch diode is evaluated as a pulsed radiographic source for diode voltages up to 6 MV on the ASTERIX generator. Peak currents of 105 to 135 kA are delivered to the diode for peak voltages of 5.2 to 6.3 MV. The diode couples efficiently to the generator for 1.6-, 2.0-, and 3.0-mm diameter tungsten or gold anode rods producing a 40-ns radiation pulse. The coupling is degraded if the anode-cathode gap Rsub C - Rsub A is too small 7.5 mm, if the anode rod extension is too short 10 mm, or if the aspect ratio Rsub CRsub A is too large 20. For the standard anodes considered here, the figure-of-merit FOM is largest 11 radairmm2 for a 1.6-mm diameter anode, corresponding to an on-axis 0 degree dose of 28 radair at 1 meter from the source and a 1.55-mm source diameter LANL measure. For a 2-mm diameter anode, the largest FOM 9.2 radairmm2 is obtained for a 1.95-mm source diameter and a 35-radair dose. Blunt-end anodes have larger on-axis source diameters and smaller FOMs than tapered-tip anodes. Measured angular distributions indicate that the dose increases monotonically from 0 degree to 80 degree by a factor of 1.6 to 1.8 and suggest that the electron distribution incident on the anode rod peaks at a large angle from the forward direction.

Subject Categories:

  • Electrical and Electronic Equipment
  • Test Facilities, Equipment and Methods
  • Electricity and Magnetism
  • Nuclear Physics and Elementary Particle Physics
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE