October 4, WEB investigations


tapping on costolone, loud  around 8:03 UTC -- bumps in hrec associated to peaks in tower accelerometer (good time 8:03:27, 30s then unlock)

tapping on bellow CT: 1254216862  04 Oct 2019 09:34:04 UTC  (04 Oct 2019 11:34:04 CEST): nothing...
tapping on LC bench South-West corner -> unlocks (Ettore explains this is because LC are used during lock)

10:29:30 - 10:30:00 knocking on tower (no ITF) but see 41.3Hz peak in WE_TOP_ACC_X

10:42 test with Kagra shaker line at 41.3 Hz (no ITF)

ITF locked
1254226220  04 Oct 2019 12:09:30 UTC  shaker line 41.3Hz see in DARM
sweep between 35 and 45 with 60s period
1254226274  04 Oct 2019 12:10:56 UTC  (04 Oct 2019 14:10:56 CEST)
sweep btw 65 and 75Hz 
1254226802  04 Oct 2019 12:19:44 UTC  (04 Oct 2019 14:19:44 CEST)
1254227412  04 Oct 2019 12:29:54 UTC  (04 Oct 2019 14:29:54 CEST)

line 70.3
1254227467  04 Oct 2019 12:30:49 UTC  (04 Oct 2019 14:30:49 CEST)
reduced amplitude
1254227530  04 Oct 2019 12:31:52 UTC  (04 Oct 2019 14:31:52 CEST)
line 70.5
1254227634  04 Oct 2019 12:33:36 UTC  (04 Oct 2019 14:33:36 CEST)
line 70.1
1254227729  04 Oct 2019 12:35:11 UTC  (04 Oct 2019 14:35:11 CEST)
line 70.3
1254227846  04 Oct 2019 12:37:08 UTC  (04 Oct 2019 14:37:08 CEST)
off
1254228088  04 Oct 2019 12:41:10 UTC  (04 Oct 2019 14:41:10 CEST)

around 12:50 ENV_WEB_MAG magnetic probe on PCAL DBOX: see comb 1Hz, apparently no coherence with DARM