JimW FabriceM HughR
Jim identified a problem that I've been harping on for months (Input matrix errors.) While for me it was improper calibration into the cartesian basis, it was also affecting the ISI & HEPI commissioning. Once we rebuilt the matrices corrrectly, the ISI commissioning we did before the holiday allowed us to bring the ITMx ISI on line with 100mHz blends (on the translational dofs) and 750s elsewhere. This greatly lowered the ITMx motion hopefully making IFO commissioning easier; especially with the notch Fabrice added to the X&Y dofs to help reduce Optic Pitching. ITMX HEPI still remains uncommissioned but that should fall away soon.
The ETMx was brought on too the help the ALS crew with similar blends and this too helped quiet the cavity. However, just as in the past, the watchdogs tripped on the T240 after a couple hours. Still looking at that one.
Here is 30 minutes second trend of the T240 glitch that tripped the ISI. It is like most all the others, pretty much just out of the blue. BTW, I'm pretty sure the Isolation was just level1 as well.
New safe.snaps were generated this morning for ITMX ISI. I also checked the same matrices at ETMX and they at least agree with what is currently supposed to be there.