Yano, Tanaka, Simon

we continued the alignment setup of the WAB in pitch, yaw and the horizontal adjustment

• We found a slight pitch of about 0.2° and adjusted a little bit the Z-stage accordingly. We checked again the height and confirmed that we have no misalignment in roll (see pictures 1-4)
• Then, we checked the yaw-alignment and the horizontal position of the baffle
  • Therefore, we set the covered plastic-box on two Misumi-frame-bars on the other side of the chamber (+Y) outside the optical table and put the laser-leveler on top of it
  • The correct alignment of the laser-leveler was again a tricky work as one has to set the vertical laser line precisely on the scratch-mark of the optical table and compare this with some other marks on the duct opening. There is also another mark, a white „target-sticker“, around the center of the optical table which indicates the center of the top opening on the 2nd floor
  • Anyway, yaw and horizontal position are in a good agreement with the scratch-mark. We found no offset within an accuracy of 0.67° (defined by the gap of the flanges which was used for the alignment)
• Also, we relocated the magnets to their nominal position on the damper and placed the damper again on the WAB suspension

Then, we started with the preparations of putting the baffle in the "saving mode" after the procedure described here

• We put the baffle "feet" on the T-beams. While two new ones (with horizontal fixing screws) are set more toward the center of the chamber, two other, older ones, were set toward the duct side. The height of each foot had to be adjusted slightly to make sure they are all plane-parallel to each other. However, we initially set the height of all feet to 60.4mm to reach approximately the same height as the optical table
• Then, we put the traverser in place. However, due to a slight height difference of the cantilever in EYC compared to IXC, the traverser's main beams were not quite plane-parallel to the ground. So, we used washers on one side, inserted between the traverser's fixing-plate and the cantilever to ensure the plane-parallelism (see picture 14)

Anyway, we discovered an Issue:

• When we tried to slide the baffle inside the duct, we discovered that a cooling-bar will be in the way, even though there is a notch in that bar for the main beam!
• That basically means, the notch is not enough to fully cover the duct-opening...
• When we tried to shift the WAB for having enough space to go through the notch, the baffle will eventually hit the duct opening!

Solution
→ remove the cooling bar for the "saving mode"