Accession Number : ADA290129

Title :   Investigation of the Paschen Curve of Nitrogen via the Application of Nanosecond Pulsed ElectroMagnetic Radiation.

Descriptive Note : Final rept. 1 Aug 90-1 Aug 93,

Corporate Author : PHILLIPS LAB KIRTLAND AFB NM

Personal Author(s) : Scholfield, David W.

PDF Url : ADA290129

Report Date : DEC 1994

Pagination or Media Count : 123

Abstract : In order to obtain lasing in microwave excited gases, a knowledge of the Paschen curve is required so that estimates can be made of the required intensity of the electromagnetic field for a given pulse duration. Data in the region below 10(exp-8) Torr-s with electromagnetic fields in excess of 10 kV/cm/Torr had been unobtainable due to technical limitations. The Paschen curve of nitrogen from pressures of 0.336 Torr via the application of nanosecond pulsed electromagnetic radiation has been investigated. Breakdown of the gas was achieved through pumping by short electromagnetic pulses and verified through the use of an optical multichannel analyzer. Previous investigations have utilized monofrequency electromagnetic signals. Adjustments for the short pulse nature of this investigation have been derived and are applied to the Paschen curve. Experiments have been conducted utilizing a pulser with machine parameters of 1 J delivered during 1.375 ns FWHM into a 50 omega coaxial line, at a peak power of 1 GW.

Descriptors :   *PUMPING(ELECTRONICS), *LASER GASES, OPTICAL EQUIPMENT, MICROWAVES, NITROGEN, PULSE RATE, LIMITATIONS, ELECTROMAGNETIC RADIATION, SHORT PULSES, SPECTRUM ANALYZERS, MULTICHANNEL, RADIOFREQUENCY PULSES, LINE SPECTRA.

Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE