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Undergraduate Kris Makrides and the first time Mimir's cryostat
is assembled. Shown (top to bottom) are the front cover, the warm
bulkhead (nee "Big Ben"), the stainless steel cryostat cover,
and the Mimir instrument cart, which supports Mimir on two clovis
pins. |
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Mimir cryostat held horizontal on its instrument cart, while Bob
Kingsland and Leo Dumais position the cryostat shell cart (which fits
*inside* the instrument cart) inside the BU SIF. |
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Zoom of Mimir cryostat on instrument cart |
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Oblique view of Mimir cryostat on instrument cart with Leo Dumais
working on cryostat shell cart. |
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NW40 O-ring capture rings. Unfortunately, we found that the holes
bored in the warm bulkhead were about 0.005" too small to fit
standard capture rings, so these were turned down to enable them to
pass the holes as built. |
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Set up for first vacuum pumping test of Mimir cryostat in the BU
SIF. Hose connects to vacuum pump. Another NW40 port was used to host
the vacuum sensor for the vacuum gauge positioned on top of the front
cover of the cryostat. |
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Details of the pumping set up. |
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Vacuum gauge showing cryostat holding *some* vacuum. It was at this
stage that we found a gross leak produced by an internal flange in
Big Ben interfering with the front window cover. After a few days
of additional machining... |