1 Feb. 2024


LOW NOISE 3 (~45-40 MpC)

>>>> UPS switch off >>>>

11:05 UTC - switched off pumps and sensors at 600N
11:10 UTC - switched off pumps and sensors at 600W
(note: turbo pumps take a while, also 1hour) to come to rest)
checked power consumption (regime) is about 500W 

13:38 UTC 600N rack off
13:53 UTC 600W rack off

14:57 UTC 600N UPS off
15:06 UTC 600W UPS off

15:20 UTC (approx) 600N and 600W back to standard condition


Observe largest effect on ENV_CEB_MAG_V, 12.8 Hz sidebands of 50Hz, 100Hz and 150Hz. 

>>>> HVAC switch off >>>>>>>>

NEB
16:01 AHU off

16:02 glitch hrec

WEB
16:01 AHU off
16:06 chillers off
16:11 cold water pump off
17:23 (~) back on

CEB
16:14 clean-rooms AHU OFF
16:19 hall ahu off
16:24 det AHU off
16:29 inj AHU off
17:00 inj AHU on
17:05 det AHU on
17:10 ceb AHU on
17:14 cr  AHU on

16:29    glitch hrec
16:56:16 glitch hrec

16:59:50 ITF unlock.

17:13 NEB on
17:23 WEB on

disconnected NI and WI ring heaters power supplies

17:45:30 relocked, but very large noise below 100 Hz

17:49:30 hrec glitch 

18:16 hrec glitch

Fede connects to mass all cables

(observed no effect on glitches: still there :-((((

Then reconnect back all RH power supplies

19:22:30 TF relocked

about 19:00 UTC CEB hall HVAC: set in manual mode and opened cold water valves 

>>> hall temperature decreses.... about -2deg in 45 minutes

19:35:30 hrec glitch (expected at ~19:38 with estimated rate of 27minutes)

19:47 ITF unlocks

20:24:30 ITF locked in low noise 3