Microwave emission from relativistic electron beams. Final report, 1 November 1983-31 October 1988
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
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Related Subjects
ELECTRON BEAMS
RELATIVISTIC RANGE
FREE ELECTRON LASERS
MICROWAVE RADIATION
MASERS
AMPLIFIERS
COMPUTERIZED SIMULATION
CYCLOTRON RESONANCE
EFFICIENCY
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON GUNS
EMISSION
FIELD EMISSION
GAIN
PROGRESS REPORT
RAMAN SPECTROSCOPY
SIGNALS
SPACE CHARGE
SPATIAL DISTRIBUTION
AMPLIFICATION
BEAMS
DISTRIBUTION
DOCUMENT TYPES
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
LASER SPECTROSCOPY
LASERS
LEPTON BEAMS
MICROWAVE AMPLIFIERS
MICROWAVE EQUIPMENT
PARTICLE BEAMS
RADIATIONS
RESONANCE
SIMULATION
SPECTROSCOPY
420300* - Engineering- Lasers- (-1989)
420800 - Engineering- Electronic Circuits & Devices- (-1989)