Both the upper and lower mirrors of the ALS-PSL periscope were installed this morning.
Also I have spent some times to align the entire ALS path on the table so that the beam can nicely climb up the periscope and hit the center of the penetration hole and duct on the PSL enclosure wall (see attached picture). This work required the WP #3723 and the metal cap of the penetration hole was put back on afterward. The ALS beam is ready to enter the HAM1 chamber (although a light pipe will be required).

/* some notes on the beam power */
before ALS-Faraday = 125.8 mW
after ALS-Faraday =  123.9 mW