Virgo Logbook

Environmental Monitoring (Environmental Monitoring)

fiori, tringali, paoletti - 12:12 Tuesday 26 September 2023 (61792)

unplugged all F7 motor crates

Following what done for WE, this morning we unplugged the F7 stepper motors of all suspension optics and benches. In particular: NI, WI, PR, BS, SR, INJ, DET and NE (the NE one was done during the ENV shift of last night, but we could not notice any appreciable improvement in hrec).

Any possible effect is to be checked in the next lock (possibly expected around 50Hz where some little structure remains)

We also have labelled each single power cable to be able to plug them back to the right smart-plug slot when needed.

Comments to this report:

Fiori, Nardecchia, Palma, Paoletti, Tringali - 16:39 Tuesday 26 September 2023 (61795)

We unplugged the stepper motors of the TCS HWS-HR mirrors of NI,WI, NE, WE and the stepper motor of PR RH.
We will unplug the WI and NI RHs, as well.

Paoletti, Fiori, Tringali - 11:01 Wednesday 27 September 2023 (61804)

It seems that the last global mains cables unplug reduced the "bump" around 47.76 Hz.

(this is a zoom)

Images attached to this comment

fiori - 16:07 Wednesday 27 September 2023 (61806)

The figure shows the same result, but comparing Hrec ASD before and after uplugging all the CEB stepper motors and TCS stepper motors. From the purple to the blu, the 47.7 Hz line reduced by a factor 3. The rest seems unchanged

Following this O3 entry (48183) by Paolo, the peaks in the range 46-49 Hz are associated to F7 crossbar of TM suspensions, in particular the 47.7 Hz peak might be attributed to the NI.

Comparing with the figures in elog 48183 we notice that the height of these residual peaks now is about the same as it was in O3.

Then, in O3b Paolo implemented "dampers" for these modes https://logbook.virgo-gw.eu/virgo/?r=47487 which reduced them down to the level of the black curve showed in Figure 1. The possibility to reimplement these dampers (increasing the DARM gain at these frequencies) and their utility has to be discussed.

Images attached to this comment

61806_1695823599_20230927_picchetti_48Hz_confronto_O3b.png

Boschi - 17:38 Tuesday 10 October 2023 (61959)

All WE motors have been re-plugged this morning in order to recenter vertical accelerometers.

Paoletti, Spinicelli - 13:51 Friday 01 December 2023 (62612)

This morning I've been asked from the Weekly Cordinator to reconnect all CEB motor crates to their original power outlets.

Done for all CEB towers but DET.

Now the crates of NI, WI, BS, PR, SR and INJ are plugged in and with the switch on the front panel in the ON position.

Some are actually powered, some are not, depending on the status of the smart-PDUs.