To keep the alignment of ITMX against the drift due to the cooling, I changed the offset of BF Yaw DC control from 780 to 655.
Then the TM YAW oplev readout was changed from -88 to 0.
No significant change of TM PIT readout was found.
The purpose of this log is to record the alignment drift in the ITMX cryopayload, so please report it by, for example, making a comment to this log if you change the alignment of ITMX while it is being cooled down.
I changed BF Yaw offset from 655 to 470 at around 15:05(JST).
I also changed counts of ITMX CRY stepper motor CH1 from-2089 to -2139.
Then, TM OpLev output changed from (PITCH, YAW)=(37, -98) to (-2, 10)
It seems that Nakano-san had moved ITMX in YAW by +100 urad seen by TM oplev ~16 hours ago
I just now changed BF offset from 380 to 300
As a result, TM oplev YAW from -68 to 0
I just now changed BF offset from 300 to 0
I also changed counts of ITMX CRY stepper motor CH1 from-2139 to -2219.
As a result, TM oplev YAW from -101 (at which the signal was saturated) to 3,
PIT from 50 to -10.
Today I changed BF offset from 0 to -150: so TM oplev YAW is changed from -70 to 40.
Today I changed BF offset from -150 to -200: so TM oplev YAW is changed from -46 to 0.
Today I changed BF offset from -200 to -255: so TM oplev YAW is changed from -61 to -15.
Today I changed BF offset from -255 to -465: so TM oplev YAW is changed from -99 to 12.
[Lucia, Enomoto-kun]
We noticed that the ITMX OPLEV signals were out of range.
To recover them, Today we changed the BF offset from -1670 to -570. Now the OPLEV signals are in range and the current values for PIT and Yaw are: 5 and -46