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Cart pair that would support Mimir. The outer cart, with the twin vertical pieces with holes, captures the warm Mimir bulkhead via clovis pins. The inside, smaller cart supports the outer stainless steel cryostat shell when it goes on and off the warm bulkhead. Bob Kingsland of the BU SIF welded all these aluminum box pieces to form the carts.
Lower, inner cart (SS cryostat shell cart), showing the four wheels that contact the shell when it rests on top of the cart. Hidden are the four underside wheels that allow the cart to move under the larger cart.
Warm bulkhead undergoing lightweighting and feedthrough hole machining.
Okuma 5 machine performing lightweighting of warm bulkhead in the BU SIF.
"Big Ben" - Warm bulkhead (with many feedthrough holes) has been welded via vertical gussets to the telescope flange and window holder. The entire assembly is mounted on a lathe for facing off the telescope flange.
Side view of "Big Ben" showing gussets, welds, and feedthrough holes.
Leo Dumais, SIF Director during the time of Mimir fabrication, inspecting the window mount and front cover.
Stepper motor controllers, stepper motor, and the slit belt unit. Our original concept for placing scenes at the focal plane of Mimir was to use a steel belt, with slits and more complex scenes photo or laser etched into the belt. A cog and drive system would move the belt across the focal plane under stepper motor control
Vibration isolator for the CTI 1050 cold head. This unit consists of two plates, spanned by thin walled stainless steel bellows. Captured springs and coaxial shafts ensured that under vacuum the cold head would float free from any hard mountings against the warm bulkhead. In this way, the piston strokes of the cold head would not drive mechanical vibrations into the optics or detector package inside Mimir.