Accession Number : AD0774095

Title :   Electron-Beam Irradiated Discharges Considered for Initiating High-Pressure Pulsed Chemical Lasers.

Descriptive Note : Rept. for Dec 72-Apr 73,


Personal Author(s) : Hofland,Robert ; Lundquist,Martin L. ; Ching,Alfred ; Whittier,James S.

Report Date : 31 OCT 1973

Pagination or Media Count : 59

Abstract : Volumetric irradiation by a short-pulse electron beam has been used to trigger long-duration, spatially uniform electric discharges in gas mixtures of He and F2 or SF6. Uniform energy deposition to 300 J/liter has been observed for atmospheric F2-He mixtures at nominal e-beam currents of 3 A/sq cm and discharge currents up to 20 A/sq cm. Operation suitable for efficient initiation of pulsed HF/DF chain lasers appears possible over a wide range of E/N and mixture ratios, limited by breakdown at large E/N and negligible field enhancement at low E/N. Approximate analytical plasma models are presented and used in conjunction with time-resolved afterglow current measurements ot obtain rate constants for F- ion-F2+ ion recombination and F2+ ion-electron recombination. Estimates of F2 dissociation fractions achieved in the experiments imply the possibility of scalable and efficient initiation of pulsed chemical lasers with such discharges. (Author)

Descriptors :   *Chemical lasers, *Electric discharges, Electron irradiation, Reaction kinetics, Excitation

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE