Remotely,
The attached shows the drifts during pumping down (started from 15:45JST on Aug. 30th, and the plots stopped at ~23:59 30th though), measured at IP/GAS/BF-LVDTs. The amout of the drifts looks not so huge though it looks the positions of the IP-L/T(/Y) are to be aligned to the original position again by STM..
Except for this, Now the RTmachine for ITMX (k1ix1) is not working properly (ADC cards are not recognized and this might be due to bad cable connection around the I/O chassis.. The connection will be checked soon) Then *the data aquisition at ITMX is stopped from ~10:00JST*. the drift looks calmed down already though.. this will be solved soon.
reference: https://www.icrr.u-tokyo.ac.jp/~yuzu/bKAGRA_summary/html/2018-08-30.html#VIS-ITMX_2018-08-30
With help of Takahashi-san,
By rebooting the I/O chassis, the problem went away in the morning.
[NOTE]
Except for this, the BIO for VBF did not work properly and the cable connection is to be invectigaed.
I tried to make larger gap between one of the primary and secondary coil of the BF-LVDTs, by using the stepping motor at IP stage, but the stuation were not much improved. Now the coils are not touching if we do not excite large motion. This will be adjusted somehow.
Just for my note, the following is the status in um:
| IP-L | IP-T | IP-Y | BF-L | BF-T | BF-V | BF-P | BF-R | BF-Y | |
| just before pumping | 750 | -750 | -50 | -1250 | 200 | -4400 | 6200 | 2200 | 16000 |
| 18h27m 30th | 720 | -71 | 106 | -2715 | -171 | -4720 | 6426 | 2130 | 20889 |
PosA/B/C => 13315/130698/-76268 steps