Yesterday Cheryl and I started working on H1 Faraday high power testing in the PSL. We checked the alignment and mounted power meters for isolation, transmission and REFL measurements. We picked off about 1% of the transmitted beam for thermal lens measurements and placed several beam dumps to catch stray beams. 

Rick S and Michael R connected for us another high-power water-cooled power meter to a second chiller (thank you!). Cheryl mounted a beam block to catch the AR beam from the first IO mode matching lens to IMC (IO_MB_L1), which was previously resting on a dog clamp next to the EOM case.