High frequency free-electron laser results

Conference · Mon Aug 01 04:00:00 EDT 1983 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:7059654

Boyer, K; Brau, C A; Newman, B E; Stein, W E; Warren, R W; Winston, J G; Young, L M

By looking at the free-electron laser as a particle accelerator working backwards, Morton realized that the techniques used to accelerate particles could be used to improve the performance of free-electron lasers. In particular, he predicted the capture of electrons in ''stable-phase'' regions, or ''buckets'' in the electron phase space, and proposed that by decelerating the buckets, the trapped electrons could be decelerated to extract significant amounts of their energy as optical radiation. In fact, since electrons not trapped in the stable regions are forever excluded from them--at least in the adiabatic approximation--displacement techniques could also be used to accelerate or decelerate electrons in a free-electron laser. This paper explains the principle behind ''phase-displacement'' acceleration and details an experiment carried out with a 20-MeV electron beam to test these predictions. Results obtained with a tapered-wiggler free-electron laser demonstrate the concepts proposed by Morton for enhanced efficiency. They show deceleration of electrons by as much as 7% and extraction of more than 3% of the total electron-beam energy as laser energy when the laser is operated as an amplifier. The experiment is presently being reconfigured to examine its performance as a laser oscillator.

• Research Organization: Chem. Division Univ. of California, Los Alamos Nat'l Lab., Los Alamos, NM 87545
• OSTI ID: 7059654
• Report Number(s): CONF-830311-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-30:4
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATION
ADIABATIC APPROXIMATION
AMPLIFIERS
BEAM DYNAMICS
BEAM EXTRACTION
BEAMS
CAPTURE
EFFICIENCY
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRON BEAMS
ELECTRON CAPTURE
ELECTRONIC EQUIPMENT
ENERGY EFFICIENCY
ENERGY RANGE
EQUIPMENT
FREE ELECTRON LASERS
LASER RADIATION
LASERS
LEPTON BEAMS
MAGNETS
MATHEMATICAL SPACE
MEV RANGE
MEV RANGE 10-100
OPTIMIZATION
OSCILLATORS
PARTICLE BEAMS
PERFORMANCE
PHASE SPACE
RADIATIONS
SPACE
TRAPPING
WIGGLER MAGNETS