CERENKOV MICROWAVE GENERATOR.
Abstract
CW Cerenkov radiation has been produced by the interaction of a modulated flat ribbon electron beam with a scalar dielectric reactor. Measurements of the radiation were made at the fundamental frequency (6.33 gc) and at the second and third harmonics. The dependence of the generated power on accelerating voltage, bunch power, and beam current was examined. The dielectric reactor used consists of two hemicones having a dielectric coefficient of about 6 at 6.33 gc. For typical operating conditions of beam current = 0.3 ma, accelerating voltage = 70 kv and bunch power = 1 watt, approximately 7.5 x 10 to the minus sixth power watt of Cerenkov radiation was obtained at 6.33 gc. Based upon the calculated amplitude of the current at 6.33 gc, a value of 193 ohms is obtained for the interaction resistance. Because of the relatively poor collector efficiency, it is estimated that the Cerenkov power may actually have been as much as 100 times greater than the measured level. The characteristics of the measured radiation are in agreement with the theory developed during previous work. The potential well technique described in earlier reports was utilized in these experiments. Also given in this report are the results of analytical investigations of: (1) design considerations for a charge dissipative overlay; (2) the effects of finite beam width on power coupled into a Cerenkov reactor; and (3) thermal limitations of high power Cerenkov generators. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1964
- Accession Number
- AD0438053
Entities
People
- A. Boornard
- J. Andersen
- J. J. Stekert
- J. M. Brumbaugh
- J. Vollmer