OSCILLATIONS IN THE PLASMA SHEATH.

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Abstract:

A theoretical investigation is conducted into the behavior of the ion plasma sheath next to a wall under a sinusoidal-in-time perturbation of the potential of the wall. The analysis includes the effects of electron-neutral particle collisions in the sheath. A numerical analysis is performed in order to obtain quantitative results. It is observed that over a certain range of frequencies there is finite region in the sheath in which the perturbation may propagate. It is of significance that this region begins away from the wall. In the collisionless case, two resonances are observed in the perturbation electric field, at omegaomegasub O .75 and omegaomegasub O .95 where omegaomegasub O is the ratio of the applied frequency to the plasma frequency of the uniform plasma. The exact frequency of these resonances is a function of the choice of floating potential of the wall. The results are found to be very sensitive to collisions. The resonances are completely damped by a collision frequency of nusub eomegasub O .25. Author

Author(s):
Schwartz, Simon H.
Author Organization(s):
POLYTECHNIC INST OF BROOKLYN NY DEPT OF AEROSPACE ENGINEERING AND APPLIED MEC HANICS
Descriptive Note:
Research rept.,
Annotation:
Oscillations in the plasma sheath.
Pagination:
0060

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
PIBAL-960
Contract/Grant Number(s):
Nonr-839(38), ARPA Order-529
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*OSCILLATION, *PLASMA SHEATHS, ANTIMISSILE DEFENSE SYSTEMS, GUIDED MISSILE DETECTION, PLASMAS(PHYSICS), ELECTRIC FIELDS, MOTION, RESONANCE, PERTURBATION THEORY, FUNCTIONS(MATHEMATICS), GAS IONIZATION, ELECTRONS, EQUATIONS, ELECTRON DENSITY, ELECTRON DENSITY
Field(s)/Group(s):
Plasma Physics and Magnetohydrodynamics
Keyword(s):
DEFENDER PROJECT
Report Date:
1966 Apr 01