Virgo Logbook

Reports 1-1 of 1

AdV-ISC (Commissioning up to first full interferometer lock)

derossi, corubolo, casanueva, cifaldi, mantovani, pinto - 14:12 Friday 16 January 2026 (68504)

Improving the LN3 aligned configuration

- Starting from LN2 this morning we went in LN3 aligned to try the new 200s timer added to smooth the transition while changing the filters. It worked smoothly.

- Then in CITF the Central Heating has been tuned with a differential step (more details in TCS entry) improving both the B1p DC and sidebands (plot 1). We relocked in Carm null 1f and no bursts were present

- Finally, we locked in the new LN3 aligned configuration and increased the SR TY gain from 6 to 10 (saved in the ini file) in order to increase the accuracy of the SR alignment control (plot 2). The improvement has to be better assessed during long locks

- From around 11h to 12h Manuel started to inject noise (see dedicated entry)

Images attached to this report

68504_1768568871_Screenshot 2026-01-16 140737.png

68504_1768569071_Screenshot 2026-01-16 141100.png

Comments to this report:

casanueva, cifaldi, corubolo, derossi, lorenzini, mantovani, pinto - 16:05 Friday 16 January 2026 (68505)

At 08:35 UTC, in the CITF configuration, we performed a differential step on the WI and NI CH powers.

The WI CH power was increased by 20%, while the NI CH power was decreased by 20% relative to their initial values.

The table below summarizes the current values.

		CH [W]	INNER DAS [W]	OUTER DAS [W]
W	on the ITF	0.052	0.150	1.79
	on the pickoff	0.324	0.028	0.289
N	on the ITF	0.094	0.48	3.1
	on the pickoff	0.577	0.075	0.505