Proceedings PaperHigh-bandwidth gamma monochromator
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The purpose of this instrument is to distinguish the temporal variations on the order of nanoseconds of a faint gamma emitter in the energy range of 10 to 20 MeV despite a coincident gamma background of lower photon energy yet orders of magnitude greater power. The instrument itself is a combination of a Compton electron monochromator comprised of two dipole magnets, a dual lens total internal reflection Cherenkov optical system, and microchannel plate photomultiplier detectors. Two units, called H1 and H2, were built differing only in magnet strength and viewing the following energy bins: H1 gamma energy bin: 15.7 to 17.7 MeV, H2 gamma energy bin: 13.7 to 15.7 MeV. The H1 design aims at a large signal-to-noise through-put and fast temporal response, and this limits the energy resolution. The H1 unit has a 671 MHz bandwidth (FWHM equals 463 ps) for the energy bin shown above.