Accession Number : AD0780103

Title :   Electrostatic Cooling of Laser Mirrors and Windows.

Descriptive Note : Final rept. 20 Mar 73-15 Feb 74,

Corporate Author : GENERAL DYNAMICS FORT WORTH TEX CONVAIR AEROSPACE DIV

Personal Author(s) : Kibler,K. G. ; Carter,H. G. , Jr

Report Date : APR 1974

Pagination or Media Count : 143

Abstract : Investigations have been conducted to determine the mechanism of electrostatic cooling and to optimize its application for laser mirrors and windows. Electrostatic cooling in air is found to be essentially an ionic drag phenomenon in which the convective heat transfer coefficient is proportional to the fourth root of corona current. Results on samples of ZnSe, aluminum, and CerVit, ranging from 1.5 to 4-in. diameter, indicate that convective cooling by electric probes in air is generally 10 to 15 times the natural convection cooling rate. This cooling rate may be increased by another factor of 2 if a polar gas is used instead of air. A guide for the estimation of electrostatic cooling for a prescribed system is given by a theoretically-formulated approximate equation which relates heat transfer coefficients to corona current, sample size, and gas parameters. Design recommendations for applications to laser mirrors and windows are included, and several optimization techniques are suggested. (Author)

Descriptors :   *LASER MATERIALS, *WINDOWS, *MIRRORS, *COOLING, ELECTROSTATIC CHARGE, HEAT TRANSFER, ALUMINUM, ZINC SELENIDES

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE