ELECTROMAGNETIC WAVE-CHARGE INTERACTION IN CROSSED FIELDS.
Quarterly progress rept. no. 8, 16 Feb 69-15 Jan 70,
CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB
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The purpose of the work is to investigate the interaction of electromagnetic waves and charge carriers in vacuum and solids. The construction of a crossed-field amplifier which incorporates the results of our noise studies has been completed. A flattened-helix circuit suspended on sapphire rods is used with a beam originating from a Kino short gun. Noise-figure measurements are in progress. Work on the crossed-field gun design method developed by Rao has been carried on to obtain designs for magnetically shielded guns. A design in which unavoidable beam crossovers are systematically reduced by periodic electrostatic focusing has been completed. An experimental evaluation of the crossed-field acoustic-wave amplifier has been conducted. A theoretical study of the electronic interaction with the acoustic wave under conditions not covered by collision-dominated dynamics has been performed and is to be published. Comprehensive measurements of amplification and lattice loss for the InSb acoustic shear wave amplifier have been performed. The work on the bulk acoustic wave InSb device has been terminated. A new project has been commenced with the aim of investigating the amplification of surface elastic waves in InSb. Theoretical work to establish the optimum crystallographic orientation and geometrical configuration for surface wave amplification is in progress. Author
- Electrical and Electronic Equipment
- Solid State Physics