Accession Number : AD0717705

Title :   Initial Experiments with Electromagnetic Energy Addition to a Gas by a Traveling Magnetic Field.

Descriptive Note : Final rept. Feb 68-15 Mar 70,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE AEROPHYSICS LAB

Personal Author(s) : Haldeman,Charles W. ; Sullivan,John P. ; Takahashi,Hironori

Report Date : SEP 1970

Pagination or Media Count : 131

Abstract : Research on a traveling wave plasma accelerator for ultimate use as a high altitude, high velocity flow simulation device is reported. The research reported covers the design and final testing of an increasing phase velocity accelrator coil system and measurements of the performance of this system operating upon argon plasma at 1.6 torr static pressure and low supersonic Mach number. Impact and static pressure measurements indicate that the exit Mach number from the accelerator was increased from .7 without magnetic excitation to 1.5 with excitation at 128,000 ampere turns per meter (the power supply limit). Under these conditions the exit impact pressure increased from 2.8 to 4.8 torr, while the static pressure dropped from 2.0 to 1.6 torr. Design and testing of the high power accelerator coils using water cooled Litz cable is discussed, coils with quality factors (omega L/K) as high as 1200 being achieved. Water cooling ability of the coils was tested and a sample was successfully operated above the maximum design excitation of 600,000 ampere turns per meter. Minor developments of the RF plasma source are also discussed and a summary of a study of wave propagation in its nonequilibrium plasma is presented. (Author)

Descriptors :   (*PLASMA ACCELERATORS, DESIGN), (*PLASMA MEDIUM, AERODYNAMIC HEATING), (*ATMOSPHERE ENTRY, SIMULATION), PLASMA GENERATORS, ELECTROMAGNETIC RADIATION, MAGNETOHYDRODYNAMICS, IONIZATION, THERMAL CONDUCTIVITY, REYNOLDS NUMBER, INTEGRALS, CONVERGENCE, MACH NUMBER, DIFFERENTIAL EQUATIONS, BOUNDARY LAYER, RADIOFREQUENCY

Subject Categories : Atmospheric Physics
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE