Pulse distortion, energy extraction, and ASE in an HF amplifier with angular multiplexing
Technical Report
·
OSTI ID:7250113
It has been proposed that 1 ns pulses can be efficiently extracted from the e-beam initiated HF laser by angular multiplexing, i.e., filling the amplifier with the 1 ns pulses, 1 ns apart in time, each pulse at a slightly different angle; each pulse has an input intensity of 1 W/cm/sup 2/ per line and almost fills the amplifier. We have treated this in a one dimensional model, neglecting transverse amplified spontaneous emission. We conclude that the scheme is efficient, and that most of the pulses are amplified but not distorted. The first few pulses are distorted by transient effects and the last pulse has an enhanced tail. The ratio of peak pulse intensity to forward ASE at the output is 10/sup 4/. We then include transverse ASE and find a drastically different situation. ASE saturates the inversion after a short time depending on pulse intensity (4 ns at I/sub o/ = 1 W/cm/sup 2/, 7 ns at I/sub o/ = 100 W/cm/sup 2/). The saturation time is only weakly dependent on the transverse reflection coefficient. Calculations were done on an amplifier system designed for 10 KJ output. At an incident peak pulse intensity of 10/sup 4/ W/cm/sup 2/-line (.77 MW/cm/sup 2/ for 77 lines) 2.5 KJ was obtained in amplified pulse energy, i.e., only 6 pulses of the 24 pulse train were fully amplified. The calculations indicate that double passing the pulse train through the amplifier would enhance the energy extracted.
- Research Organization:
- Sandia Labs., Albuquerque, N.Mex. (USA)
- DOE Contract Number:
- E(29-1)-789
- OSTI ID:
- 7250113
- Report Number(s):
- SAND-76-0430
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
AMPLIFIERS
BEAMS
CHEMICAL LASERS
ELECTRON BEAMS
ELECTRONIC EQUIPMENT
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LASER FUSION REACTORS
LASERS
LEPTON BEAMS
ONE-DIMENSIONAL CALCULATIONS
PARTICLE BEAMS
PULSES
THERMONUCLEAR REACTORS
420300 -- Engineering-- Lasers-- (-1989)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
AMPLIFIERS
BEAMS
CHEMICAL LASERS
ELECTRON BEAMS
ELECTRONIC EQUIPMENT
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LASER FUSION REACTORS
LASERS
LEPTON BEAMS
ONE-DIMENSIONAL CALCULATIONS
PARTICLE BEAMS
PULSES
THERMONUCLEAR REACTORS