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Cell face to hold wire grid (grid not yet installed) |
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Kapton ring added |
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Wire grid cell parts |
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Wire grid (unmounted) in cell half |
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Wire grid filter cell with grid cell installed |
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Wave washer atop wire grid cell, in filter cell, about to be energized with C-ring |
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Wire grid cell, fully assembled |
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Half-wave plate cell parts |
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HWP cell halves |
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HWP cell half with leaf springs |
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HWP cell halves with MgF2 plates, about to be mounted |
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One MgF2 plate installed in a HWP cell half |
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Both MgF2 plates in their respective cell halves. |
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HWP cell halves, assembled. There is a thin kapton ring (1 mil?) separating the two MgF2 pieces. |
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HWP cell mounted in geared filter cell |
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HWP in geared filter cell, top view |
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J-Band Corrector parts. The optical design indicated that J-band would need a field flattener for the wide field F/5 configuration. This corrector flattens the J-band PSF variations (Strehl variations across the field). In practice, on the sky, we found no difference between using and not using the J-band corrector, so it has been decommissioned and removed from Mimir. |
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J-band corrector lens installed in lens cell. |
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Fully assembled J-band corrector lens in its filter cell. |
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Parts for collimator foreward section, and its assembly drawing. |
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Collimator forward section with L2 (BaF2) installed |
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Collimator forward section with L1 and L2 installed. [installing L1 on top of L2 was done using bent piano wire to grasp the L1 cell in 3 places and then gently set the L1 cell in place.] |
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Reflection of Dan Clemens in "antireflection" coating on L1 in foreward collimator section. |
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Another Clemens reflection in L1 |
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Completed collimator foreward section, in vacuum bell jar after assembly. |