Non-Linear Behaviour of Ion Waves
Abstract
The report presents experimental evidence of the excitation of higher harmonics in the presence of an ion-acoustic wave stability. This instability was excited in an argon plasma column which was produced in a magnetic field of 110 Gauss. The pressure of the plasma was between 1 micrometer Hg and 3 micrometer Hg with an ion density of 10 to the 11th power/cc and an electron temperature of 2 eV. The ion acoustic wave is excited by the drifting electrons in the plasma. The drift motion is the result of the D.C. electric field between the cathode and two grids which are kept at ground potential. The electron drift velocity was estimated to be 4 x 10 to the 6th power cm/sec. The low frequency oscillations were detected by a langmuir probe and analyzed by a panoramic spectrum analyzer. With cathode potential of 100v and 160v anode currents were 1.0 and 1.6A respectively. At 200v the anode current was 1.8A.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1974
- Accession Number
- AD0778472
Entities
People
- Alexander J. Anastassiades