100_0390
Oli relocating the stationary limit switch to begin to clear the azimuth hole. (This limit switch, like several others, was broken--we should bring spares).
100_0391
I pushed the racks to one side to make more space...
100_0392
The platform that I suggest we consider would be 68-72" high, approximately the level of Ollie's feet in this picture, and would be at least 4x4', large enough to comfortably fit a transfer dewar. A 10' transfer line reaches the mid-point bayonet fitting of the cryostat. A shelf for a laptop to monitor the fill level (and for convenient keeping to take up into the telescope) could be rigged on the beams at chest height.
100_0434
Top view of the available space for a platform.
100_0435
Stairs to a 4x4' plywood transfer platform could be a good winter-over project. A 6' lift could bring 100 l transfer dewars (21" dia. x 55" high, 110 lbs.) up to the platform level.
100_0433
Az hole access for mounting the cryostat will require replacing the steel beams that support the ladder--another good project for Alan?
100_0432
Top of the az hole.
100_0437
Oli made a template for the cryostat diameter with the mounting flange removed from its three fixed brackets. It appears with the blue beams removed, it could fit without removing the helium lines. (Removing these lines from the wrap also looks feasible.)
100_0438
Clearance at the top of the az hole is OK.
100_0442
With the telescope at el=0, there is plenty of space to bring the cryostat up with a winch hung from one of the VME crate brackets.
100_0440
The cryostat would then be set on a stand on the floor of the DASI cab.
100_0431
The telescope is brought to el=90 for mounting the cryostat.
100_0430
The mounting flange viewed from the az hole at el=90.