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Bend Blocks:

The dispersed light from the faceted grating is coupled to a linear array of 160 bolometers via 8 waveguide bend blocks.  Each block mounts 20 detectors above and below the plane of the parallel plate waveguide in an alternating fashion, maximizing spacing between adjacent bolometers.  The waveguides have a constant rectangular cross section and use curved waveguide feeds.  The blocks are fabricated by bolting 21 slices together.