Accession Number:

AD0697363

Title:

UHF-PLASMA INTERACTION--THE TWO-STREAM INSTABILITY OF A current-CARRYING PLASMA,

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF INST FOR PLASMA RESEARCH

Personal Author(s):

Report Date:

1966-08-01

Pagination or Media Count:

152.0

Abstract:

The collective space charge interaction between the electron and ion streams of a current-carrying plasma results in the enhancement of electrostatic oscillations carried by the two streams. When the relative drift velocity between the electrons and ions exceeds a critical value of the order of the electron thermal velocity, some oscillations begin to grow exponentially in amplitude and the to-stream instability of a current-carrying plasma ensues. This study comprises a thorough experimental investigation of the onset properties of this instability and an examination of its nonlinear properties. The experimental apparatus consists of a UHF TM010 cavity loaded along its axis with a plasma column produced by a pulsed P.I.G. reflex discharge. The electric field of the cavity serves to excite a UHF current along the plasma column which in turn can produce the two-stream instability during every half-cycle. The time scale for electrostatic interaction is much shorter than the UHF half-period. Considerable attention was given to the design of this appratus so that it would be amenable to the Stringer formulation of the linearized two-stream theory and thus would permit a meaningful comparison between the experimental and theoretical instability onset conditions. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE