During the first part of the morning shift, we performed broad band noise injections on the suspended benches in order to collect data that will be used for the projections of local control noise.
SNEB and SWEB were already treated during the shift of April 15th: https://logbook.virgo-gw.eu/virgo/?r=59803. We therefore focused on SDB2, SPRB, SIB2 and SDB1.
We wanted to inject noise not exceeding ~5Vrms in order to avoid saturation of the actuators.
SDB2 injections:
6:44:31 SDB2_TX start noise injection (1e-8)
6:53:24 SDB2_TX start noise injection (5e-2), see Fig.1 (blue: with noise, purple: without noise)
5' clean data
7:00:40 stop injection
7:05:19 SDB2_TY start noise injection (1e-8)
7:10:44 SDB2_TY start noise injection (5e-2), see Fig.2
5' clean data
7:16:25 stop injection
7:24:11 SDB2_TZ start noise injection (1e-8)
7:26:52 SDB2_TZ start noise injection (5e-2), see Fig.3
5' clean data
7:32:51 stop injection
7:37:00 SDB2_Z start noise injection (1e-8)
7:38:49 SDB2_Z start noise injection (5e-2), see Fig.4
5' clean data
7:46:20 stop injection
SPRB injections
7:53:49 SPRB_TX start noise injection (1e-8)
7:58:25 SPRB_TX start noise injection (5e-2) ==> start a small bump ~16-18Hz on Hrec, less visible on DARM, Fig.5
5' clean data
8:04:23 stop injection
8:07:41 SPRB_TY start noise injection (1e-8)
8:10:48 SPRB_TY start noise injection (5e-2) > some noise between 80 and 90 Hz is visible, Fig.6
5' clean data
8:10:16 stop injection
8:19:39 SPRB_TZ start noise injection (1e-8)
8:25:04 SPRB_TZ start noise injection (5e-2) > some noise visible on hrec at 83 Hz, and between 150 and 200 Hz, less visible on LSC_DARM (Fig.7).
5' clean data
8:30:31 stop injection
8:35:04 SPRB_Z start noise injection (1e-8)
8:39:06 SPRB_Z start noise injection (5e-2) ==> very large bump around 12Hz, 20Hz and 48Hz on both Hrec and DARM ==> seem to be glitches (stray light??), not seen permanently (Fig.8).
5' clean data
8:44:45 stop injection
SIB2 injections
8:50:25 SIB2_TX start noise injection (1e-8)
8:53:23 SIB2_TX start noise injection (5e-2), Fig.9
5' clean data
8:59:03 stop injection
9:02:01 SIB2_TY start noise injection (1e-8)
9:05:00 SIB2_TY start noise injection (5e-2) ==> small bump from 18Hz to 23Hz on Hrec, less evident on DARM, Fig.10
5' clean data
9:11:40 stop injection
9:14:48 SIB2_TZ start noise injection (1e-8)
9:17:08 SIB2_TZ start noise injection (5e-2) ==> small bump at ~47Hz, Fig.11
5' clean data
9:22:41 stop injection
9:24:50 SIB2_Z start noise injection (1e-8)
9:26:59 SIB2_Z start noise injection (5e-2) ==> small bump at ~47Hz, Fig.12
5' clean data
9:32:50 stop injection
Last injections on SDB1
9:43:57 SDB1_TZ start noise injection (1e-9)
9:47:29 SDB1_TZ start noise injection (3e-6) ==> visible lines @108Hz and 153Hz (already 3e-7) that increase with the higher noise, a new structure appears @31Hz
5' clean data
9:54:31 SDB1_TZ start noise injection (6e-6) ==> same structure as before, with increased lines between 30Hz and 40Hz (Fig.13)
5' clean data
10:00:10 stop injection
10:07:29 SDB1_Z start noise injection (6e-9)
10:11:12 SDB1_Z start noise injection (6e-6) ==> start a resonance @157Hz
10:13:09 SDB1_Z start noise injection (7.5e-6) ==> higher excitation of the 26Hz SRCL line (Fig.14)
5' clean data
10:18:56 stop injection
Repeating also the injection on TX/TY (for comparison to previous injections, see https://logbook.virgo-gw.eu/virgo/?r=59914)
10:21:42 SDB1_TY start noise injection (??): we made a mistake and we were not injecting the wanted noise.
10:26:13 SDB1_TY start noise injection (1e-5) ==> we see similar effect as the last time, resonances between 100Hz and 200Hz (Fig.15)
5' clean data
10:31:24 stop injection
10:36:14 SDB1_TX start noise injection (1e-6)
10:37:00 SDB1_TX start noise injection (3e-6, same as last time) ==> huge increase of noise between 30Hz and 200Hz (similar as last inj), Fig.16
5' clean data
10:44:39 stop injection
Data will be further analyzed offline.
