STUDIES ON MILLIMETER WAVE GENERATION. Technical Report No. 4
Methods for the generation of coherent electromagnetic radiation in the low millimeter and submilliraeter range are proposed and evaluated. Harmonic generation in nonlinear media is analyzed. Maxwell's equations are solved for a medium which is characterized by a scalar linear permeability but a permittivity which is a scalar function of the electric field intensity. Two methods are used to solve the quasi-linear vector wave equation: the perturbation method, and the iterative methcd. The results obtainedfrom both methods agree. The Cherenkov radiation of a bunched beam is analyzed in two slow-wave structures: dielectric tube waveguide and plasma rod waveguide. For the same operating conditions it was determined that Cherenkov radiation in a dielectric tube waveguide can be 20 or more times larger than that in an infinite medium. This was found to be due to second coherence in the slow-wave structure. It was found that Cherenkov radiation of a prebunched beam in a plasma rod waveguide can be greater than that in a dielectric tube waveguide but plasraa rcd waveguides are difficult to attain in the low millimeter range due to physical limitations on magnetic field intensity and/or electron density. A Doppler-Relitron oscillator is proposed based on the Doppler frequency shift which magnifies the cyclotron frequency of the beam by about 20 to 100 times. Therefore the magnetic field can be reduced by the same amount by passing the beam in a slow-wave dielectric tube waveguide whose phase velocity is close to the beam axial velocity. The magnetic field necessary for operation of this device at 300 kmc was determined to be of the order of 5000 Gsuss. (auth)
- Research Organization:
- Illinois. Univ., Urbana. Electrical Engineering Research Lab.
- DOE Contract Number:
- AT(11-1)-392
- NSA Number:
- NSA-14-022279
- OSTI ID:
- 4171704
- Report Number(s):
- TID-6200
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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