Akutsu, Miyo, Simon

We finally attached the heat-links to the baffle flanges and the Cryo-head of the cryostat in IYC.

However, in contrast to our initial plan, we did not attach the heat-links to the suspension-frame with a cable-tie as this would decrease the heat conductivity. In addition to this change of plan, we discovered several other issues which forced us to improvise accordingly:

• Installing the heat-link bracket is quite difficult as with the baffle already in place, the available space is limited. We, however, succeeded with two persons (one holding, the other one screwing) -> figure 1
• The heat-link bracket did not fit in its destinated place due to a „misshaped“ bracket on the bottom side of the cryo-head. Solution: we set it one row of screws higher, so it is fixed now only with two screws. -> figure 2
• We could not find M8 washers for the bracket. Solution: right now, we did not tighten the screws that hold the bracket on the cryo-head. We will do this when we have proper washers.
• The heat-links turned out to be too long for a proper vibration isolation in the way as it was designed. So, they are constantly touching the suspension frame and the cryostat. Solution: we led the heat-links through a large hole in the suspension base-plate and thus increased the path toward the bracket. A side-effect is that the heat-links are shaped more hyperbolically and we expect at least a small benefit to the vibration isolation. -> figures 3-5