Relativistic klystron amplifiers driven by modulated intense relativistic electron beams. Memorandum report

Technical Report · Wed Apr 11 00:00:00 EDT 1990

OSTI ID:6715292

Lau, Y Y; Friedman, M; Krall, J; Serlin, V

This paper, gives an overview of the novel relativistic klystron amplifiers which are driven by an annular intense relativistic electron beam (500 kV, 10 kA range) which is modulated by an external rf source (1.3 GHz, 100 kW range). Experiments, theory, simulation and simple models are presented to illustrate the unusual properties of such devices, which result from the intense space charge of the beam. Chief among them include electrostatic insulation against vacuum breakdown at high power levels, efficient current modulation, short bunching length, and amplitude and phase stability of the output signal. Many of these unexpected features were revealed in two separate experiments: one with the lower current beam (5 kA, 2 cm beam radius), and the other one with a higher current beam (16 kA, 6.6 cm beam radius). Three gigawatts or rf power at 1.3 GHz were generated with the large diameter beam at an efficiency of 35 percent with 37 dB gain. These experiments will be reviewed, along with a combination of particle simulation results and analytic models which facilitate the interpretation. Pay special attention to the unfamiliar features of these amplifiers, and shall address the critical issues which need to be solved before such amplifiers can fulfill their potential in a wide range of applications.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 6715292
• Report Number(s): AD-A-221075/5/XAB; NRL-MR--6627
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426000* -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
AMPLIFIERS
BEAMS
DESIGN
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
KLYSTRONS
LEPTON BEAMS
MATHEMATICAL MODELS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
MICROWAVE TUBES
MODULATION
PARTICLE BEAMS
POWER
RADIATIONS
RELATIVISTIC RANGE
RF SYSTEMS
SIMULATION
SPACE CHARGE
STABILITY