Accession Number:

ADA265955

Title:

Characterization of Electromagnetic Fields in an Extended Chamber at the Short Pulse Experimental Electron Device (Speed) Simulator

Descriptive Note:

Final rept. May-Dec 1992

Corporate Author:

PHYSITRON INC HUNTSVILLE AL

Personal Author(s):

Report Date:

1993-04-01

Pagination or Media Count:

67.0

Abstract:

The electromagnetic EM fields present during testing in a large vacuum chamber at the Short Pulse Experimental Electron Device SPEED facility are observed and measured using B-dot and D-dot detectors. Because the cathode of the vacuum diode is exposed to the chamber, the EM fields are significant and could adversely affect nonfaraday-shielded experiments. The differential magnetic fields and electric fields are nearly isotopically distributed, build to a maximum at 100-200 ns of 7.9 x 10 to the 9th power Am-s and 9 x 10 to the 10th power Vm-s, respectively, then decay for approximately 1000 ns. Fourier analysis of spectra gives frequencies 460, 550, and 60 MHz characteristic of the dimensions of the chamber and of electrons rebounding between the target and the pulse generators. A collimated damper is designed which should eliminate most EM fields in future tests in this configuration.

Subject Categories:

  • Electromagnetic Shielding
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE