Fig.1 shows the temperature changes in the EYV and the humidity changes.
The temperature seemed to recover, and the humidity reduced to ~ 62 % level.
I turned off the Sunrise heater because the temperature in EYV increased by 0.2 °C for 2 hours after turning on the defumidifier.
[Hayakawa, Sawada, ...]
A defumidifier whose power was 390W was put in the EYV area. To compensate the heat generation in the EYV room, I reduced the Sunrise heater power from 900W to 600W by 300W.
The following is the detailed process,
- 09:39 Mine IN
- ... No record
- 10:09 Yend1F IN
- 10:11 Yend1F OUT
- 10:15 EYV IN
- 10:23 EYV OUT
- 10:27 Yend1F IN
- 10:30 Yend1F OUT
- 10:44 Center IN
- 10:51 Center OUT
- 10:54 Mine OUT
We will put a defumidifier that generates 390W of heat in the EYV room if approved. We will also decrease the heater power by 300W in the Sunrise heater.
We will put a defumidifier that generates 390W of heat in the EYV room if approved. We will also decrease the heater power by 300W in the Sunrise heater.
[Hayakawa, Sawada, ...]
A defumidifier whose power was 390W was put in the EYV area. To compensate the heat generation in the EYV room, I reduced the Sunrise heater power from 900W to 600W by 300W.
The following is the detailed process,
- 09:39 Mine IN
- ... No record
- 10:09 Yend1F IN
- 10:11 Yend1F OUT
- 10:15 EYV IN
- 10:23 EYV OUT
- 10:27 Yend1F IN
- 10:30 Yend1F OUT
- 10:44 Center IN
- 10:51 Center OUT
- 10:54 Mine OUT
I turned off the Sunrise heater because the temperature in EYV increased by 0.2 °C for 2 hours after turning on the defumidifier.
Fig.1 shows the temperature changes in the EYV and the humidity changes.
The temperature seemed to recover, and the humidity reduced to ~ 62 % level.
We performed the recovery of the acoustic injection setup (Speaker and AMP power on)
Now we can do the acoustic injection test using
K1:PEM-EXCITATION_EY0_RACK_1_EXC (100 count would be good to start injection)
We took the pictures at the EYA of the arm side.
Dropbox : https://www.dropbox.com/work/Dropbox%20KAGRA/Personal/Yokozawa/picture/240515
Since about 2 weeks ago, I could not access the Y-end water fluid meter via the network.
(The cause is not understood, but its web server sometimes hangs up.)
Today I went to the Y-end and checked it. The measurement was continued.
So I saved the data on the CF memory and rebooted the Y-end water fluid meter, manually.
After that, it worked well and the data was not lost.
YokozaWashimi]
We performed maintenance of PEM sensors at EY
- TMSY ACC: We assigned an accelerometer (S2113441) and located it on the TMSX box temporarily. [Fig.1,2]
- TMSY MIC: S2011972 is already working in the TMSY booth. Its signal looks fine. [Fig.1,3]
- EYC BOOTH MIC: One microphone is already working and its signal looks fine. We can't see it by eye from outside the booth. In our spreadsheet, it should be S1809324.
We will install TMSY ACC/MIC into the box with a specialist next chance.
I checked the amount of water fluid in the Y-arm. It is decreasing and about 60 tons/hour now.
The water power plant near the Mozumi entrance has already worked since June? 2023.
The rotation speed of the water wheel is 1200 rpm(fixed value) and the total weight of the motor/water-wheel unit is 12 ton according to the Kamioka mine company. So, we might be able to see any effect of this heavy body rotation at 20Hz (1200 rpm).
One more smaller power plant will be built near Route 41 around the dormitory in 2025.
After discussing the corresponding people, we will set PEMs on the optical table.
Today we brought back the portable seismometer from the Y-end to the CS.
[Suzuki, YokozaWashimi]
Today we measured the vibration from the water pipes in the Y-end.
- We located an ACC (TEAC710) near the portable seismometer (see also klog24323) on the under-floor pipe and on the pipes-frame.
On the floor, any significant signal from the water was not found. (Blue in Fig.1)
On the pipes-frame, vibration from the water was observed (Green in Fig.1)
In both cases, there was no coherence with the seismometer. - We moved the ACC to the floor near the pipes-frame. The vibration from the water disappeared (Pink in Fig.2)
- We checked the coherence between the ACC on the pipes-frame and the oplevs. There was no coherence. (Fig. 3)
Before (Blue) : 2023/03/07 13:00:00 (JST) (Confirmed the spectrum is almost same in 11:00:00 and 12:00:00)
After (Red) : 2023/03/07 17:00:00 (JST) (Confirmed the spectrum is almost same in 18:00:00 and 19:00:00)
Bottom three spectrums are the EY1F temporal seismometer (X,Y,Z direction respectively)
As you can see, the bump from 6 Hz to 50 Hz appeared.
[YokozaWashimi]
Today we located a portable seismometer (Trillium Compact) at the Y-end, behind the HITCAH air cooler (not working now).
I checked the cables and sensors in my office. All of them look healthy.
[YokozaWashimi]
We replaced the connector for IY0 Dsub15 -> MAG13, PTB110 from the temporally one to the new one.
However, the barometer channel shows some strange signals.
So we moved back to the original one.
I checked the cables and sensors in my office. All of them look healthy.
We continuously measured the Schumann resonance at Yend.
At the same time, we checked the permanent magnetometer at Yend
Position : +Y from the EYC chamber, 35 cm below the beam duct
We kept the portable magnetometer and its cables at Yend now.
We performed the cabling for the EYC microphone.
We performed the hammering test at EYA
1. (Reference) On the floor
2. On the Yagura1
3. On the Yagura2
4. On the L shape jig
5. On the table
The result of this analysis will appear soon.
[YokozaWashimi]
Today we installed a new SUS plate (W600 x L 700) to stabilize the flow surface.
But the situation was not improved.
(The actual level was 30~40cm)
Since the readout of the fluid meter looks unhealthy, I checked its status.
The amount of water becomes large and the water surface is unstable.
The SUS plate, which makes the water level higher and the velocity slower, is W600 x L400 now, but it should be longer (L700 or so)
[YokozaWashimi]
Today we installed a new SUS plate (W600 x L 700) to stabilize the flow surface.
But the situation was not improved.
(The actual level was 30~40cm)