Reports until 16:41, Thursday 06 March 2014
H1 INS (SEI)
jim.warner@LIGO.ORG - posted 16:41, Thursday 06 March 2014 (10592)
ETMY ISI tf troubles

I tried running tf's on ETMY last night, but was foiled by my lack of understanding of the ETM sus overview screen (see Jeff's log # somethingorother). After SUS finished up alignment, I went down and unlocked the ISI to try again. After several hours of fruitless DTT tf's I'm giving up for now. I went down this morning and fiddled with the cables some, we tried several quad configurations (normal damping, increased pitch damping and all off), but have only managed to get worse, not better. The best guess we have right now is that maybe TMS is causing the badness (they are unplugged and can't damp at all) , but it doesn't seem a good guess because they weren't damped on the test stand (I think). More digging tomorrow, Arnaud wants the chamber for tonight.

 

For context, the attached DTT shows one degree of actuation and 3 associated sensors. Each curve  should kind of look like the red trace, make a peak(s, 3 seems normalish for this chamber) @ 1hz , then a valley @2.5hz, then another peak(s) @ 5hz. The extra notches at 2, 4 and 9.5 hz are "bonus", or maybe "bogus".

Images attached to this report