CYCLOTRON-WAVE INSTABILITIES,
Abstract
Interactions of waves on electron streams or plasmas are studied for several geometric configurations of finite cross section in a finite magnetic field. The plasma is assumed to be at zero temp rature. Each of the constituents of the plasma is assumed to have a monoenergetic, nonrelativistic velocity parallel to the magnetic field. It is further assumed that either macroscopic neutrality exists or static spacecharge forces are negligible. For the most part the quasi-static analysis is used. For the case of two drifting streams cyclotron waves act to giveinstabilities which are either convective (spatially growing) or nonconvective (RTIME GROWING), depending upon whether the streams are drifting in the same or opposite directions. These instabilities, unlike the usual two-stream space-charge wave-interactions, exist for physically realizable unneutralized electron streams without the requirement that the streams drift in the same direction with almost equal velocities. For oppositely directed streams with equal velocities, oscillations are predicted at approximately one-half of the cyclotron frequency and were observed at the output of an experimental tube in which two concentric coaxialelectron streams were allowed to interact in an evacuated drift space. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0426079
Entities
People
- B. J. Maxum
Organizations
- University of California, Berkeley