MICROWAVE STUDY OF PLASMAS PRODUCED BY ELECTROMAGNETICALLY DRIVEN SHOCK WAVES
urement of very high electron densities in plasmas produced by shock waves. The electron density can be determined from the phase angle of a reflection coefficient at the sharp boundary of the plasma that exists at the end of the shock tube. The electron densities measured by an Xband frequency (9000 Mc) range from 10/sup 13/ to 10/sip 15/ cm/sup -3/. The plasma is produced by shock waves of Mach number 8 to 15 in argon at a pressure of 0.1 mm Hg. The electron densities are compared with values predicted by theoretical calculations under thermal equilibrium. The maximum density detectable reaches 1 x 10/sup 16/ cm/sup -3/. The afterglow plasma which continues after the shock wave has passed is investigated. The loss mechanism of electrons during a few hundred microseconds seems not to depend on diffusion but on recombination. The temperature of electrons which are almost in thermal equilibrium with ions and neutral atoms in this afterglow plasma is sustained for a relatively long time. (auth)
- Research Organization:
- Nagoya Univ., Japan
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-021153
- OSTI ID:
- 4694622
- Journal Information:
- J. Phys. Soc. Japan, Journal Name: J. Phys. Soc. Japan Vol. Vol: 18
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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