Accession Number:

ADA639361

Title:

High-Sensitivity Interferometry of Plasmas and Gases in Pulsed Power Experiments

Descriptive Note:

Conference paper

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV

Report Date:

1999-06-01

Pagination or Media Count:

5.0

Abstract:

Accurate measurements of plasmas and gases in pulsed power devices are needed so they can be used or avoided as desired. This paper reviews measurements of plasmas and gases using the high-sensitivity, two-color interferometer in use at the Naval Research Laboratory NRL since 1993. The instrument uses two cw NdYAG lasers at 1.064 and 0.532 pm wavelengths that can be aligned along the same line-of-sight to simultaneously measure electron and neutral densities. This interferometer can measure optical path changes phase shifts as small as lo- waves. The interferometer s capabilities are illustrated by several examples, including the first measurement of electrons co-moving in vacuum with an intense proton beam, detection of gas turbulence, preionization of gas from a supersonic nozzle, and gas desorption from a metal surface exposed to intense UV.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE