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PEM (EY)
shinji.miyoki - 22:13 Monday 16 June 2025 (34254) Print this report
Comment to Incereasing the humidity at the EYV area (34171)

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.

Images attached to this comment
PEM (EY)
shinji.miyoki - 16:35 Monday 16 June 2025 (34243) Print this report
Comment to Incereasing the humidity at the EYV area (34171)

I turned off the Sunrise heater because the temperature in EYV increased by 0.2 °C for 2 hours after turning on the defumidifier.

PEM (EY)
shinji.miyoki - 12:03 Monday 16 June 2025 (34233) Print this report
Comment to Incereasing the humidity at the EYV area (34171)

[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
Images attached to this comment
PEM (EY)
shinji.miyoki - 9:16 Friday 13 June 2025 (34179) Print this report
Comment to Incereasing the humidity at the EYV area (34171)

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.

PEM (EY)
takaaki.yokozawa - 12:00 Thursday 12 June 2025 (34171) Print this report
Incereasing the humidity at the EYV area
Ususally, we didn't take care so much for the humidity, but I noticed the humidity of the EYV area exceeded more than 70 %, and increased day by day.
Images attached to this report
Comments to this report:
shinji.miyoki - 9:16 Friday 13 June 2025 (34179) Print this report

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.

shinji.miyoki - 12:03 Monday 16 June 2025 (34233) Print this report

[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
Images attached to this comment
shinji.miyoki - 16:35 Monday 16 June 2025 (34243) Print this report

I turned off the Sunrise heater because the temperature in EYV increased by 0.2 °C for 2 hours after turning on the defumidifier.

shinji.miyoki - 22:13 Monday 16 June 2025 (34254) Print this report

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.

Images attached to this comment
PEM (EY)
takaaki.yokozawa - 16:49 Monday 25 November 2024 (31753) Print this report
Recoverying the acoustic injection setup at Yend
[OMU members, Yokozawa]

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)
PEM (EY)
takaaki.yokozawa - 7:27 Thursday 16 May 2024 (29523) Print this report
Took pictures EYA chamber arm side
[Uchiyama, Yokozawa]

We took the pictures at the EYA of the arm side.
Dropbox : https://www.dropbox.com/work/Dropbox%20KAGRA/Personal/Yokozawa/picture/240515
PEM (EY)
tatsuki.washimi - 18:49 Thursday 28 March 2024 (29002) Print this report
Maintenance of the Y-end water fluid meter

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.

Images attached to this report
PEM (EY)
tatsuki.washimi - 15:01 Wednesday 15 November 2023 (27620) Print this report
PEM maintenance at EY

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.

Images attached to this report
PEM (EY)
tatsuki.washimi - 9:40 Tuesday 26 September 2023 (26901) Print this report
Water fluid decreacing in the Y-arm

I checked the amount of water fluid in the  Y-arm. It is decreasing and about 60 tons/hour now.

Images attached to this report
PEM (EY)
shinji.miyoki - 15:41 Tuesday 19 September 2023 (26800) Print this report
Information about the water power plant around the Mozumi area

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.

PEM (EY)
takaaki.yokozawa - 17:18 Thursday 24 August 2023 (26466) Print this report
Cabling for the ACC and MIC at the TMSY optical table
I performed the BNC cabling for the accelerometer and microphone for the TMSY optical table.
After discussing the corresponding people, we will set PEMs on the optical table.
Images attached to this report
PEM (EY)
tatsuki.washimi - 22:13 Monday 01 May 2023 (25068) Print this report
Protable seismometer

Today we brought back the portable seismometer from the Y-end to the CS.

PEM (EY)
tatsuki.washimi - 21:19 Monday 20 March 2023 (24473) Print this report
Vibration from the water pipes

[Suzuki, YokozaWashimi]

Today we measured the vibration from the water pipes in the Y-end.

  1. 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.
  2. We moved the ACC to the floor near the pipes-frame. The vibration from the water disappeared (Pink in Fig.2)
  3. We checked the coherence between the ACC on the pipes-frame and the oplevs.  There was no coherence. (Fig. 3) 
Images attached to this report
PEM (EY)
takaaki.yokozawa - 18:35 Thursday 09 March 2023 (24336) Print this report
Comment to Seismometer signal after starting the Y2300 pump (24323)
Its peak also detected in the spectrogram.
Images attached to this comment
PEM (EY)
takaaki.yokozawa - 7:29 Thursday 09 March 2023 (24323) Print this report
Seismometer signal after starting the Y2300 pump
I checked the spectrum of the seismometers before and after the Y2300 pump work.

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.
Images attached to this report
Comments to this report:
takaaki.yokozawa - 18:35 Thursday 09 March 2023 (24336) Print this report
Its peak also detected in the spectrogram.
Images attached to this comment
PEM (EY)
tatsuki.washimi - 16:05 Monday 27 February 2023 (24180) Print this report
Protable seismometer at EYC field

[YokozaWashimi]

Today we located a portable seismometer (Trillium Compact) at the Y-end, behind the HITCAH air cooler (not working now).

Images attached to this report
PEM (EY)
takaaki.yokozawa - 13:46 Wednesday 04 January 2023 (23458) Print this report
Battery recovery ondotori EYC2F
During this work, I temporary turned on the LEDs for clean booth and after this work, I turned off the LEDs
PEM (EY)
tatsuki.washimi - 15:02 Tuesday 04 October 2022 (22333) Print this report
Comment to EY Dsub15 -> MAG13, PTB110 (22326)

I checked the cables and sensors in my office. All of them look healthy.

PEM (EY)
tatsuki.washimi - 12:03 Tuesday 04 October 2022 (22326) Print this report
EY Dsub15 -> MAG13, PTB110

[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.

Comments to this report:
tatsuki.washimi - 15:02 Tuesday 04 October 2022 (22333) Print this report

I checked the cables and sensors in my office. All of them look healthy.

PEM (EY)
takaaki.yokozawa - 8:17 Tuesday 23 August 2022 (21853) Print this report
Measurement of the Schumann resonance at Yend
[Fukunaga, YokozaWashimi]

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.
Images attached to this report
PEM (EY)
takaaki.yokozawa - 21:08 Friday 13 May 2022 (20726) Print this report
Cabling for the EYC microphone
[YokozaWashimi]

We performed the cabling for the EYC microphone.
PEM (EY)
takaaki.yokozawa - 12:39 Monday 09 May 2022 (20661) Print this report
Hammering test EYA
[Dan, Yokozawa]

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.
Images attached to this report
PEM (EY)
tatsuki.washimi - 17:46 Wednesday 20 April 2022 (20535) Print this report
Comment to Status of the Y-end water way (20469)

[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)

Images attached to this comment
PEM (EY)
tatsuki.washimi - 12:17 Wednesday 13 April 2022 (20469) Print this report
Status of the Y-end water way

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)

Images attached to this report
Comments to this report:
tatsuki.washimi - 17:46 Wednesday 20 April 2022 (20535) Print this report

[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)

Images attached to this comment
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