Microwave emission from relativistic electron beams. Final report, 1 November 1983-31 October 1988

Technical Report · Wed Mar 01 04:00:00 EST 1989

OSTI ID:5522495

Bekefi, G

Profile modification by optical guiding in a Raman free-electron laser operating at microwave frequencies was studied experimentally. A cyclotron autoresonance maser (CARM) amplifier was designed, built, and tested. This CARM operates at 35 GHz with a power output of 10 MW and an efficiency of 3%. Observations of Field Profile Modifications in a Raman Free-Electron Laser Amplifier: The author reports measurements of the spatial distribution of the RF electric-field intensities and phases induced in a free-electron laser amplifier operating in the collective (Raman) regime. The studies are carried out at a microwave frequency of about 10 GHz in a FEL using a mildly relativistic electron beam of about 200 keV energy and 1 - 4A current. The probing of the ponderomotive (space charge) and the electromagnetic waves is accomplished by means of small movable electric dipole antennas inserted into the interaction region. A 35-GHz Cyclotron Autoresonance Maser Amplifier: studies of a cyclotron autoresonance maser are presented. The measurements are carried out at a frequency of 35 GHz using a mildly relativistic electron beam (1.5 MeV, 260 A) 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 bifilar helical wiggler. Measurements give a small signal gain of 90 dB/m and a saturated power output of 10 MW. The corresponding electronic efficiency is 3%. Computer simulations are also presented.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (USA). Research Lab. of Electronics
• OSTI ID: 5522495
• Report Number(s): AD-A-209653/5/XAB
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
420800 -- Engineering-- Electronic Circuits & Devices-- (-1989)
AMPLIFICATION
AMPLIFIERS
BEAMS
COMPUTERIZED SIMULATION
CYCLOTRON RESONANCE
DISTRIBUTION
DOCUMENT TYPES
EFFICIENCY
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRON GUNS
ELECTRONIC EQUIPMENT
EMISSION
ENERGY RANGE
EQUIPMENT
FIELD EMISSION
FREE ELECTRON LASERS
GAIN
LASER SPECTROSCOPY
LASERS
LEPTON BEAMS
MASERS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
MICROWAVE RADIATION
PARTICLE BEAMS
PROGRESS REPORT
RADIATIONS
RAMAN SPECTROSCOPY
RELATIVISTIC RANGE
RESONANCE
SIGNALS
SIMULATION
SPACE CHARGE
SPATIAL DISTRIBUTION
SPECTROSCOPY