andrew.lundgren@LIGO.ORG - posted 07:36, Monday 01 June 2015 - last comment - 20:47, Wednesday 03 June 2015(18739)
DAC glitches in mode cleaner
In the first observation intent time from today, there are DAC glitches in MC2 M3. They don't obviously appear in DARM at the time we checked, but they do appear in a number of channels. The first plot is an Omega scan showing glitches in MC_L, and the second shows that they correspond to zero crossings in MC2 M3 control.
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I grabbed Andy's images and lined them up in keynote. Thought folks might want to see how convincing this is for DAC zero crossing glitches.
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Jim, Dave
we checked to see if the 18bit DAC card for SUS MC2 M3 happened to be close to the new DC power supply. It is not, in fact it is the furthest from the power supply.
At least twice tonight there has been glitching of MC2, similar to what Kiwamu described last week. It is visible in POP18 and AS90, as well as the MC2 witness sensors. I was not looking at the IMC REFL camera at the time, so I can't say whether it was the same kind of kick in yaw as before.
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