We have moved one vertex vacuum chamber ('beamsplitter chamber'/'service vessel') onto the table into the final position for the 'first', i.e. the south-east-most IFO (see designed layout here: Link). In addition, we have moved two of the cube vacuum vessels (formerly the end mirror chambers of the Holometer) into the desired position to comprise the vacuum enclosure for the 'first' (i.e. the south) laser filter cavity.

The move was done with an engine hoist, where we suspended the chambers close to over their desired position, and performed the remaining rotational and horizontal positioning by torqueing and pulling on the suspended chamber from the sides, after which the chamber was slowly lowered. 

The rotational alignment of the vertex chamber was verified using a laser level, where we first aligned the laser beam along the flange that will define the future transmitted IFO arm by aligning the laser across two bolts along the diameter of the top flange by eye (see attached photo). We then checked the distance of the beam from the wall in B111D to verify alignment of the 'arm' with the room. We found the arm flange to be rotated from a line parallel to the wall by 1.4 degrees, which is probably within the error of our measurement, and is certainly within the standard deviation of the process of rotating the chamber when placing it down using the engine hoist. Importantly, this alignment will allow the arm to clear the the door frame in the intended position.

The east vacuum cube for the LFC was placed a couple of inches further away from the west cube than it will be for the final configuration, to allow the other vacuum components to be placed between them.