DeRossi Tringali Fiori

quiet reference
1407074648  07 Aug 2024 14:03:50 UTC  (07 Aug 2024 16:03:50 CEST)

injection 63 Hz line with Vibe-tribe
start 16:08:50

volume is (too) large:
seismic line at 63Hz is >100 the quiet reference and there are harmonics

however nothing seen in Hrec

bump shows up in B4, but that B4 signal becomes very noisy at low frequency 

10s of good data: 14:08:53 to 14:09:03

ITF unlocks at about 14:10:13


new lock
quiet reference
1407079820  07 Aug 2024 15:30:02 UTC  (07 Aug 2024 17:30:02 CEST)


injecting colored 50-70 volume
1407080550  07 Aug 2024 15:42:12 UTC  (07 Aug 2024 17:42:12 CEST)
300s

15:55 UTC Camilla finished the first intervention:
placed filter 3 (reduces transmitted light by factor 1000) in front of razor blade which blocks the beam from the scanning fabry perot
closed a bit two irises on the beam to the phase camera

moved shaker position on EPRB


repeat the same injection, same  volume

1407081530  07 Aug 2024 15:58:32 UTC  (07 Aug 2024 17:58:32 CEST)
1407081917  07 Aug 2024 16:04:59 UTC  (07 Aug 2024 18:04:59 CEST)

no sensible reduction of B4 bump during injection.

16:20 UTC Camilla finished the second intervention:
added filter 0.5 (transmits 30% of the light) on the phase camera path

repeat again the same injection, same volume
1407082939  07 Aug 2024 16:22:01 UTC  (07 Aug 2024 18:22:01 CEST)

switched off lights under the platform ... and continue the shaking
1407083303  07 Aug 2024 16:28:05 UTC  (07 Aug 2024 18:28:05 CEST)
1407083636  07 Aug 2024 16:33:38 UTC  (07 Aug 2024 18:33:38 CEST)


shaker on PR tower base, W side

70Hz line
1407084293  07 Aug 2024 16:44:35 UTC  (07 Aug 2024 18:44:35 CEST)
something in B4 but no in Hrec....
60Hz line
1407084522  07 Aug 2024 16:48:24 UTC  (07 Aug 2024 18:48:24 CEST)
1407084729  07 Aug 2024 16:51:51 UTC  (07 Aug 2024 18:51:51 CEST)
seen also in Hrec 
65Hz line
1407084802  07 Aug 2024 16:53:04 UTC  (07 Aug 2024 18:53:04 CEST)
seen a bit in B4
64Hz
1407084935  07 Aug 2024 16:55:17 UTC  (07 Aug 2024 18:55:17 CEST)
seen in B4 a bit in Hrec as well
ITF unlocked