For the future noise budget, I temporally installed the portable microphone behind the precision cooler of the PSL room.
Channel name is
K1:PEM-PORTABLE_MCF_RACK_MCF0_ADC1_DSUB5_OUT_DQ
The timeline of this work is as follows.
12:38 mine in
12:46~13:06 installation of the microphone (S2314781) close to the precise cooler
13:06~13:18 Ondotori maintenance work
13:19 mine out
In this cases, there are (almost) no coherence between DARM and microphone.
I continued to check it, we don't need to perform the turn on/off test for the precision cooler PSL
FIg.1.
In previous measurement, there are construction outside of the mine, I selected the weekend night run (13th Jun. 18:00:00UTC)
But as I showed there are so limited coherence with microphone.
Fig.2.
I checked the coherence with micophone of the MCF booth and PR booth microphone.
Actually, there are several coherent frequency, but amplitude would be smaller, so the sound effect to the IMC booth and PR booth itself is not so large.
Fig.3.
I checked the coherence between DARM and booth microphones, but as expected, there are so limited coherence.
Fig.4.
Finally, I compared the coherence with PSL microphones.
As shown in Fig.4., there are several coherence below 140 Hz, but very limiting coherence were there above 140 Hz.
Fig.5.
(We already showed this results), there are several coherence between DARM sensitivity and PSL microphones in the range of the 300 - 400 Hz
Fig.6.
I expanded the horizontal range to 300 - 400 Hz.
As you can see in Fig.6., several (something narrow) peaks had similar spectrum shape and coherence, but we cannot described all excess noise in DARM come from the sound from PSL room.
One concern is that the some sideband like response for the PSL acoustic and/or there are very week point in PSL room in 300 - 400 Hz.
We cleaned the portable microphone and backed to PEM shell.
After this work, I turned off the portable PEM channel
https://klog.icrr.u-tokyo.ac.jp/osl/?r=34307
11:28 Entered the mine
11:30 Started the cable cleaning
11:41 Finished
12:05 Exit from center area
12:08 Go out from tunnel