Experimental and theoretical studies of a 35 GHz cyclotron autoresonance maser amplifier

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859694· OSTI ID:5552792

DiRienzo, A C; Bekefi, G; Chen, C; Wurtele, J S ^[1]

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1. Department of Physics, Research Laboratory of Electronics and Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)

Experimental and theoretical studies of a cyclotron autoresonance maser (CARM) amplifier are reported. The measurements are carried out at a frequency of 35 GHz using a mildly relativistic electron beam (1.5 MeV, 130 A, 30 nsec) generated by a field emission electron gun followed by an emittance selector that removes the outer, hot electrons. Perpendicular energy is imparted to the electrons by means of a short bifilar helical wiggler. The entire system is immersed in a uniform axial magnetic field of 6--8 kG. With an input power of 17 kW at 35 GHz from a magnetron driver, the saturated power output is 12 MW in the lowest TE{sub 11} mode of a circular waveguide, corresponding to an electronic efficiency of 6.3%. The accompanying linear growth rate is 50 dB/m. When the system operates in the superradiant mode (in the absence of the magnetron driver) excitation of multiple waveguide modes is observed. A three-dimensional simulation code that has been developed to investigate the self-consistent interaction of the copropagating electromagnetic waveguide mode and the relativistic electron beam is in good agreement with the experimental observations.

• OSTI ID: 5552792
• Journal Information: Physics of Fluids B; (USA), Journal Name: Physics of Fluids B; (USA) Vol. 3:7; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
ACCELERATORS
AMPLIFIERS
BEAMS
CYCLIC ACCELERATORS
CYCLOTRONS
ELECTRON BEAMS
ELECTRON GUNS
ELECTRONIC EQUIPMENT
EMISSION
ENERGY RANGE
EQUIPMENT
FIELD EMISSION
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
LEPTON BEAMS
MAGNETIC FIELDS
MASERS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
PARTICLE BEAMS
RELATIVISTIC RANGE
RESONANCE