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Instrument: BCS : Bragg Crystal Spectrometer
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The Bragg Crystal Spectrometer (BCS) is designed to study plasma
heating and dynamics during the impulsive phase of solar
flares. It consists of two bent crystal spectrometers, BCS-A and
BCS-B, that observe the H-like line complex of Fe XXVI, and
He-like complexes of Fe XXV, Ca XIX and S XV. Each spectrometer
consists of a double detector placed behind a pair of germanium
crystals that diffract the incoming X-rays into the
detectors. The two structures are mounted at the front of the
Yohkoh spacecraft, on either side of the central panel, with a
thermal filter mounted in front of each spectrometer. The
crystal dispersion axes are oriented north-south.

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[Summary provided by NASA]