New millimeter free electron laser using the cyclotron-undulator interactions of relativistic spiralling electrons

Thesis/Dissertation · Sat Jan 01 00:00:00 EST 1983

OSTI ID:5133532

Grossman, A A

Theoretical and experimental studies of a novel hybrid combination of collective free electron laser (FEL) and cyclotron maser (gyrotron) is described. Experiments are carried out in both laser oscillator and superradiant configurations using an intense relativistic electron beam with energy adjustable between 600 kV and 830 kV and current 10-20 kA which is prepared with a substantial transverse velocity component (..beta.. perpendicular approx. = 0.4) before injection into an undulator (60 periods with either l/sub 0/ = 12.5 or 8.5 mm). Motion occurs at the cyclotron (wc = eB/sub 0//..gamma..mc) and undulator (k/sub 0/Vz) frequencies. Theory is developed for the convectively unstable, Doppler upshifted (FEL type) electromagnetic wave having frequency w approx. = 2..gamma..z/sup 2/(k/sub 0/Vz + wc) where ..gamma..z = (1 - ..beta..z/sup 2/)/sup -1///sup 2/ and k/sub 0/ = 2..pi../l/sub 0/. Megawatt level radiation at 1.7 mm, together with millimeter harmonics and other microwave emission is observed in a simple Fabry-Perot resonator system driven above oscillation threshold by sufficiently large undulator field amplitude and initial transverse velocity. Comparison of spectroscopic data with features of the theory permit identification of the cyclotron-undulator interactions.

• Research Organization: Columbia Univ., New York (USA)
• OSTI ID: 5133532
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FREE ELECTRON LASERS
MICROWAVE AMPLIFIERS
CYCLOTRON FREQUENCY
ELECTRON BEAMS
EXPERIMENTAL DATA
HARMONICS
INSTABILITY
MICROWAVE RADIATION
RELATIVISTIC RANGE
AMPLIFIERS
BEAMS
DATA
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
INFORMATION
LASERS
LEPTON BEAMS
MICROWAVE EQUIPMENT
NUMERICAL DATA
OSCILLATIONS
PARTICLE BEAMS
RADIATIONS
420300* - Engineering- Lasers- (-1989)