Before installing the new laser for YPcal, we installed two irises on each of Path 1 and Path 2 to record the alignment of the original laser.
The irises were mounted on tripods.
These tripods were placed between EYA and EYC.
Test of alignment-recording setup before installing a new laser source in Pcal-Y
With Misato Onishi and Seiya Matsuo.
We performed a test of the setup to record the current Pcal-Y alignment before installing a new laser source in the Pcal-Y Tx module.
We are planning to install an additional laser source inside the Pcal-Y Tx module. Since this work may change the present optical alignment by accident, we would like to record the alignment outside the vacuum chamber during the installation work as a backup reference.
Our current plan is to extract the two Pcal-Y beams from the Tx module, propagate them along the tunnel toward ETMY, and record their positions using irises. Today, we assembled a jig to extract the beams from inside the Tx module.
However, it took longer than expected to extract both beams from the Tx module at the same time. At the moment, one of the beams is slightly blocked by another structure. It should be possible to solve this by further adjusting the positions of the optical components, but we had to stop the work today due to time limitations.
We plan to continue this work next week.