Hirata, Akutsu + help Ushiba, Nishimoto

Continued the work, but stopped due to that the cooling bar for the cryopayload was blocking partly the path of the WAB moving. This issue happened in 50% probability in my experience/impression, but should not happen. In the worst case, this may also block the interferometer light beam. Ushiba-kun and Nishimoto-kun will remove the cooling bar.

Details:

• Detached four heat links completely from the WAB (Fig 1), as they may disturb our work (moving the WAB) if they were there. The detached ones are now stocked at the shelf in the EYT clean booth together with the fixing screws.
• Detached support blocks under the WAB suspension's base plate (Fig 2, which shows a combination of the two block, which supported one side of the base plate; so there are such four blocks in total).

Then, we setup the new traverser jig. Mostly were they assembled as designed, but there are several concerns:

• The crow clamps (Fig. 3) to support the jig onto the breadboard in the cryostat might interfere against washers on the breadboard. This time, fortunately, it was not the case.
• Some narrow electric wires (for thermometers, I guess) might be tensioned when installing the traverser jig (Fig. 4). This time, fortunately, it was not the case.
• It would be hard to detach the jig after the WAB is in the saving mode.... hmmm..
• Anyway we could setup the traverser, and could move the WAB! That was nice.

But as mentioned already, on the path of WAB moving, the cooling bar leaned in (Fig. 5). After Ushiba-kun removes the cooling bar, we will be able to finish the WAB moving.

It would be important to check what is the situation in the other cryostat immediately.