Tj and I went onto the HWS table this morning with the aim of trying the 800nm band pass filter on ITMX HWS (our beam is 790nm). Neither worked well (FBH800-40 800±40nm was very dirty, FBH800-10 800±10nm filtered too much of our beam >80%). We went back to the 532nm green mirror Y2S-1025-0*. We did adjust the spot position to be more centered (see photo) and changed back H1:TCS-ITMX_HWS_ORIGIN_Y  and _X to 511.5 pixels (alog#62616).

New references taken at 1334683563 with IFO unlocked and ALS shuttered and IFO cold.

*I'm not sure it's wise to have this mirror possibly reflecting light back into the IFO. I will contact the manufacturers to get the specs for them but I worry we could be reflecting 1064 back in. We could test noise levels by blocking the HWs periscopes when locked at low noise.