Yesterday we mounted and routed the various cables from the QPDs and picomotors on the H2 ETMY Transmon ISC breadboard.

Using ISC breadboard layout D1101585 for the picomotor locations and D1000238 for the actual picomotor cable assembly, the connectors are conected as follow:

J1 (25-pin connector) = mounted in the connector bracket in the lowest location on the ETM side of the breadboard ( photo of the bracket)

J2 (4-pin mighty mouse connector) = M3 (green beam)

J3 (4-pin mighty mouse connector) = M6 (green + IR beam)

J4 (4-pin mighty mouse connector) = M4 (IR beam)

J5 (4-pin mighty mouse connector) = M14 (IR beam)

During assembly of the picomotor mounts, we are not sure if the 'verticl' and 'horizontal' axis of the picomotors are maintained (e.g. we did not know which of the picomotor was horizontal or vertical).

Also, the two QPD sleds are aligned, with each a single 25-pin connector (D1000231), are mounted in the connector brackets. There are two QPDs per 25-pin connector, one for the green sled adnd one for the IR sled. The QPDs are ordered such that QPD1 is the first QPD the beam will be director to (by a beam splitter), while QPD2 is the last QPD on the sled.

The connectors are mounted with pin-1 on the top right corner, with the connector mounting bracket on the primary mirror side of the breadboard. (photo of the bracket)

25-pin IR QPD connector mounted on the lowest position

25-pin GRN QPD connector mounted on the middle position.

Here is a photo of the top view of the breadboard with the cables routed and clamped on the breadboard. The 'ETM Side' is on the right.

The only cable missing on the breadboard is for the bam diverter (the larger structure on the bottom right on the breadboard).

Matt and Bram