This morning, I try to adjust the input axis of PMC because it seems that the axis of incidence is shifted to PIT from the image of the camera. So, I tweaked the M2 mirror in figure 1 in the PIT direction.

Fig.2 is the results. From the top, the transmitted light intensity of the PMC, the reflected light intensity, and the rest is the DCQPD signal of the IMC REFL. The amount of transmitted light (K1:LAS-POW_PMC_DC_INMON) has improved a little(5.8 W -> 5.9 W), but as far as the camera is concerned, the alignment is not much better. The REFL DCQPD signal shows that adjustment of the incident optical axis has no effect on the transmitted optical axis.

To improve the alignment more, I need to move the M3. However, M3 is close to the reflected optical axis and needs to be moved by inserting a wrench. Since the PSL is currently in observation mode, I could not spend much time on it, so I gave up on it this time....

We also confirmed that there was no change in the spectrum of each signal before and after the adjustment. (Figure 3)