Virgo Logbook

Reports 1-1 of 1

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

mantovani, mwas - 17:58 Friday 04 July 2025 (67217)

SR tx scan vs BNS range

Following the analysis done in the past days, which showed correlation between B1p DC (and the B1p beam shape) and the BNS range, we decided to make a scan of the SR tx in order to try to drive this effect.

In the Figure 1 a trend of the test is visible and we can say that for SR tx offset of ~ 0.022

- the B1p DC is minimum

- the OG is lower than the 0 position

- the frequency noise coupling is higher than the 0 position

but the BNS range is maximum; this may lead to a lower mistery noise? to be understood

We leave for this lock a ramp going to the optimal point for SR tx (which will be reset at the next unlock)

Images attached to this report

Comments to this report:

mwas - 20:14 Saturday 05 July 2025 (67223)

Today (Jul 5) around 18:00 UTC I have set back the ASC_SR_TX_SET to 0.022 with a 2 hours long ramp. As it was reset a few hours before by the unlock, and the BNS range has been lower by a few Mpc since that relock.