Accession Number : AD0258779

Title :   MICROWAVE CAVITY MEASUREMENTS OF IONIZATION IN THE TRAIL OF HIGH VELOCITY PELLETS

Corporate Author : UTAH UNIV SALT LAKE CITY

Personal Author(s) : GEHMLICH,D.K. ; GROW,R.W. ; HARRISON,D.R.

Report Date : 31 OCT 1959

Pagination or Media Count : 1

Abstract : The ionization density of the ion trail following a high speed cylindrical aluminum pellet with a length of 0.187 in. and with a diameter of 0.220 in. was measured. The pellet was fired through a resonant microwave cavity. The change in the resonant frequency of the cavity was observed when the ion trail was within the cavity. Ion densities between 10 to the 13th and 14th power per cubic centimeter were measured for pellet velocities between 1.7 and 2.1 kilometers per second at a distance of 30 cm from the end of the gun barrel. Ion densities between 1 and 3 x 10 to the 13th power per cubic centimeters were measured for velocities between 1.9 and 2.1 kilometers per second at 73 cm down range. The diameter of the ion stream was found to be about 2 inches. Within the range of velocities cited, the flare length was approximately proportional to pellet velocity. A measurement of the delay time between the pellet and the onset of ionization at 30 cm and 73 cm down range indicated that the ionization stream decelerates faster than the pellet. (Author)

Descriptors :   *CAVITY RESONATORS, *GAS IONIZATION, *HYPERVELOCITY PROJECTILES, DENSITY, INSTRUMENTATION, IONIZATION, IONS, MEASUREMENT, MICROWAVES, PELLETS

Distribution Statement : APPROVED FOR PUBLIC RELEASE