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- W2007476986 abstract "A series of free-electron laser (FEL) amplifier experiments were conducted at the Los Alamos National Laboratory to measure the energy extraction and the optical gain of tapered magnetic wigglers. A 1 ns, 1 GW CO <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</inf> laser pulse, focused at the center of a 1 m long wiggler, will interact with a coaxial, 20 MeV electron beam composed of four 30 ps wide micropulses. Although a single-pass gain of 2 percent is expected, the large difference in pump and electron pulsewidths, plus the inability to fully temporally resolve the 30 ps gain pulses, present special measurement challenges. Therefore, much attention has been given to the enhancement of the size of the gain signal relative to the power of the CO <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</inf> laser pulse. A combination of techniques involving polarization discrimination, signal nulling, and spectral bandwidth discrimination has been determined to be effective. A description of these techniques and their utilization to measure the magnitude and phase of the complex gain <tex xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>G = ge^{itheta}</tex> and the picosecond duration of the gain pulses will be given." @default.
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- W2007476986 date "1981-08-01" @default.
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- W2007476986 title "Optical diagnostics for the Los Alamos free-electron laser amplifier experiment" @default.
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- W2007476986 doi "https://doi.org/10.1109/jqe.1981.1071294" @default.
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