Accession Number:

AD0844800

Title:

Relevant Laboratory Experiments

Descriptive Note:

Corporate Author:

AVCO EVERETT RESEARCH LAB INC EVERETT MA

Personal Author(s):

Report Date:

1968-11-01

Pagination or Media Count:

48.0

Abstract:

An experiment was designed to test the basic assumptions of a new model which describes debris motion towards the northern conjugate region from high altitude nuclear explosions. The experimental facility consists of a coaxial plasma source which accelerates ionized aluminum into an environment where the background pressure and magnetic field can be controlled. The initial plasma velocity was 10 cmmicrosec, the background magnetic field was varied from zero to 220 gauss and the pressure between 2 microns and 50 microns in air. These conditions are such that 1 ordinary momentum transfer collisions are unimportant 2 the magnetic pressure is negligible as compared to dynamic plasma pressure and 3 the only momentum exchange mechanism is charge exchange collisions in the presence of a magnetic field. Ultraviolet radiation from the plasma source preionizes the background gas producing an Alfven speed based on the ion density which is less than the plasma velocity. The ambient magnetic field is swept up by aluminum plasma and provides the mechanism for charge exchange momentum exchange process. The aluminum plasma is decelerated with the addition of a magnetic field nearly parallel to the plasma motion. The deceleration rate is proportional to the background pressure. It is noted that the charge exchange pickup is effective even at relatively low magnetic fields where the air-ion gyro radius based upon initial plasma velocity is several times the plasma scale length. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE