We completed the setup to record the current Pcal-Y alignment before installing the new laser source.
After assembling the beam extraction setup, we installed irises along the beam paths and aligned the two Pcal-Y beams so that they passed through the centers of the irises. This setup provides a reference for the current optical alignment outside the vacuum chamber and allows us to reproduce the alignment if it is accidentally changed during the installation work.
We installed the new laser head inside the Pcal-Y Tx module. At the end of the work, we checked the alignment of the existing laser using the irises again. Both beams still passed through the centers of the irises, indicating that the alignment had not changed during the installation.
We also checked the beam position on the RxPD. Compared with its position before the work, the beam had shifted downward by approximately 1 cm. However, this displacement is within the adjustment range of the picomotor and is therefore not expected to be a problem.
We also confirmed that the YPcal state reached High Power state.
