IX_REF1_4K/50K temperatures drastically increased, as shown in Fig. 1. We will continue to monitor. As you know, REF2/4 coryocoolers are also not working in IX. So the situation is getting worse. REF3 is the only cryocooler that is working well in IX.
The vacuum level enhancements came from N2, CO2, and Ar from the REF4_4K_HEAD because its temperature exceeded ~ 28K.
EY_4K_REF3_50K temp seems to continue decreasing.
Ushiba, Tanaka
We performed TF measurements from IMC WFSs to DARM by shaking IP1 and IP2 PZTs. However, since many earthquakes were occured during the today's commissioning time, we could not performed the measurement from IP2 YAW to DARM. As for other DoFs, we did them. Fig.1-3 show the result.
Then, we performed the noise projection from IMC WFS1 PIT/YAW to DARM by using TF results from WFS1 to DARM by shaking IP1. Fig. 4 shows the result, red curve is the DARM spectrum. blue curve is the projection of WFS1 PIT and green curve is the projection of WFS1 YAW According to the projection result, some peaks, for example ~152 Hz, ~281 Hz, seem to be cauesd by the jitter in PSL. However, the some peaks' height, especially around 330 Hz and 360 Hz seem to surpass the DARM spectrum. The one of possibilties is that the coherences from WFS to DARM by shaking IPs are not enough at the first place. So we may need to increase the coherece by increasing the excitation amplitude or the average time. Or the other is that WFS1 signal is not decoupled among their WFSs. So we may use the decouled sensor (DOF{4,5}_{P,Y}_IN1) instead of WFS1 and WFS2.
I measured OLTF of DARM, MICH, and PRCL (fig1-3).
There is no significant difference on the OLTF, so the calibration should be fine.
Compared to the recent OLTF (klog#34412 and klog#34533), the deviations are within approximately 0.3 dB for MICH and PRCL, and within 0.1 dB for DARM.
I recovered the voltage settings for IM heaters for ITMY and ETMX around 14:40 because OBS has started.
We turned on the OBS INTENT around 14:29 JST after today's calibration check by Hido-kun.
Time stamp:
0948: Entered the tunnel.
0951: Entered center front room
0951: Entered center experimental area
0955: Entered Yarm
1011: Entered Yend
1051: Out from Yend
1108: Entered center experimental area
1112: Entered parking area at center
1115: Went out tunnel and closed the shutter of the tunnel entrance.
With Satoru Ikeda
Summary:
On-site investigation revealed that the connectivity issue of the EYA TCam server was caused by a faulty UPS. We removed the UPS and connected the rebooter directly to a 100 VAC outlet, which successfully restored the EYA TCam functionality.
Details:
We physically visited the EYA booth to inspect the UPS and server setup.
The UPS showed no visual indicators or alarm sounds.
We confirmed that the UPS input power was normal (100 VAC present).
We removed the UPS from the setup and attempted a reset with the connected load (rebooter) disconnected, but there was no reaction from the UPS—no LEDs, no sound.
Based on this, we judged that the UPS was faulty and did not proceed with battery replacement.
We brought the UPS back to Mozumi for further inspection.
The rebooter (to which the EY TCam server is connected) was plugged directly into a 100 VAC outlet.
After power-on, the TCam server booted normally. We verified that TCam image capture was functional.
Next Steps:
The UPS has alreadly be moved to Mozumi. We will check it later but, it is likely that it needs to be replaced.
There have been many mysteries of this kind for oplev sums since iKAGRA. One option to resolve this phenomenon would be to set a direct power monitor just after the collimator of the oplev light source.
Because of high seismic noise due to several big earthquakes, a swarm of earthquakes, and a typhoon (Fig.4), the IFO lock was almost not realized last night. Therefore, the IM temps of ITMY and ETMX decreased significantly. I kept adjusting the current of the heaters for them. The attached values are the original settings before the adjustments.
Fig.1 and 2 show the original settings for ITMY and ETMX. I increased by 2 Volts for each for several hours. After that, I reduced by 1 volt for each. So the present voltages are larger than 1 volt for each.
I will recover the original setting values after confirming the stable, continuous lock.
I recovered the voltage settings for IM heaters for ITMY and ETMX around 14:40 because OBS has started.
EY_4K_REF3_50K temp seems to start a slight decrease. While the outer shield (EY_80K_SHIELD_TOP) temp keeps increasing. We need several days of monitoring.
I checked the OPLEV sum for TM and MN for the last~ one month.
TM OPLEV seems to have ~ day-level oscillation, with a half-day level small oscillation. Is it related with tidal motion? The total value seems to decrease gradually.
MN OPLEV seems to have ~ week level oscillation.
There have been many mysteries of this kind for oplev sums since iKAGRA. One option to resolve this phenomenon would be to set a direct power monitor just after the collimator of the oplev light source.
Recently, (from Sunday) the peak around 110Hz is large enough. Do we need beam position adjustment?
Operator's name: Kimura, Takahashi
Shift time: 9-17 (JST)
Check Items:
VAC: No issues were found.
CRY cooler:
10:00 We found a 10K difference in 4K_REF3_50K_HEAD/BAR (Fig.1).
Kimura-san checked Q-Mass (Fig.2).
16:00 Temperature drift became small (Fig.3).
Kimura-san checked Q-Mass (Fig.4).
Compressor: No issues were found.
IFO state (JST):
09:00 The shift started. The status was "OBSERVING".
10:10 Lock lost.
10:34 "OBSERVING"
13:38 Lock lost.
14:42 "OBSERVING"
14:57 Lock lost.
17:00 This shift finished. The status was "LOCKING".
This is the first time trouble for this cryocooler. According to the past same troubles in IX, the increase to 120K took one day, and it started cooling just after peaking, and it took 5 days to reach 90K. Of course, there are no guarantees for recovery.
EY_4K_REF3_50K temp is now over 110K. Then the temperature of EY_4K_REF4_50K also exceeded the critical temperature. So slight H2O is expected to be released.
The vacuum level at the EYT side slightly increased from 3.6 to 4.1 x 10^-6 Pa. No changes in vacuum level at the EYGV side. No serious temp changes in the duct shields.
One concern is the temperature of EY_80_SHIELD_TOP is now increasing, and we should avoid it will over the critical temperature.
I heard from Kimura-san that a battery alarm has been triggered on the UPS around the EYA chamber.
It might to be a UPS related to the EYA Tcam server.
It is unclear at this point whether it is related to the current trouble.
The replacement battery arrived last week and is ready to be installed.
>So This Tuesday or Thursday seems to be a good day for recovering TCam (though I'm not sure a detailed work plan on this Tuesday and Thursday yet).
I agree.
Since the rebooter is connected to the UPS, there is also a suspicion that something might be wrong with the UPS.
Operators name: Hirose, Nakagaki
Shift time: 9-17 (JST)
Check Items:
VAC: No issues were found.
CRY cooler:
10:00 We contacted Ushiba-san and Kimura-san because we found a 10K difference in temperature checks. (Fig1)
Kimura-san checked Q-Mass and said no urgent action was needed. (Fig2)
16:00 Issue could not be confirmed. (Fig3, Fig4)
Compressor: No issues were found.
IFO state (JST):
09:00 The shift was started. The status was "OBSERVING".
17:00 This shift was finished. The status was "OBSERVING".
Problem with EY-TCam images not displaying in control room (Klog #34542)
EY_4K_REF3_50K temp is now over 110K. Then the temperature of EY_4K_REF4_50K also exceeded the critical temperature. So slight H2O is expected to be released.
The vacuum level at the EYT side slightly increased from 3.6 to 4.1 x 10^-6 Pa. No changes in vacuum level at the EYGV side. No serious temp changes in the duct shields.
One concern is the temperature of EY_80_SHIELD_TOP is now increasing, and we should avoid it will over the critical temperature.
This is the first time trouble for this cryocooler. According to the past same troubles in IX, the increase to 120K took one day, and it started cooling just after peaking, and it took 5 days to reach 90K. Of course, there are no guarantees for recovery.
EY_4K_REF3_50K temp seems to start a slight decrease. While the outer shield (EY_80K_SHIELD_TOP) temp keeps increasing. We need several days of monitoring.
EY_4K_REF3_50K temp seems to continue decreasing.
> Is it possible to mask the edge of 1.5mm from the measurement results of HCB surface of sapphire ears?
Yes, that's possible. I'm currently waiting for my software account to be prepared.
I’ve prepared a detailed report.
(I’ll update it once I receive the account and apply an appropriate mask to the ear data.)
Since the rebooter is connected to the UPS, there is also a suspicion that something might be wrong with the UPS.
>So This Tuesday or Thursday seems to be a good day for recovering TCam (though I'm not sure a detailed work plan on this Tuesday and Thursday yet).
I agree.
I heard from Kimura-san that a battery alarm has been triggered on the UPS around the EYA chamber.
It might to be a UPS related to the EYA Tcam server.
It is unclear at this point whether it is related to the current trouble.
The replacement battery arrived last week and is ready to be installed.
With Satoru Ikeda
Summary:
On-site investigation revealed that the connectivity issue of the EYA TCam server was caused by a faulty UPS. We removed the UPS and connected the rebooter directly to a 100 VAC outlet, which successfully restored the EYA TCam functionality.
Details:
We physically visited the EYA booth to inspect the UPS and server setup.
The UPS showed no visual indicators or alarm sounds.
We confirmed that the UPS input power was normal (100 VAC present).
We removed the UPS from the setup and attempted a reset with the connected load (rebooter) disconnected, but there was no reaction from the UPS—no LEDs, no sound.
Based on this, we judged that the UPS was faulty and did not proceed with battery replacement.
We brought the UPS back to Mozumi for further inspection.
The rebooter (to which the EY TCam server is connected) was plugged directly into a 100 VAC outlet.
After power-on, the TCam server booted normally. We verified that TCam image capture was functional.
Next Steps:
The UPS has alreadly be moved to Mozumi. We will check it later but, it is likely that it needs to be replaced.
Time stamp:
0948: Entered the tunnel.
0951: Entered center front room
0951: Entered center experimental area
0955: Entered Yarm
1011: Entered Yend
1051: Out from Yend
1108: Entered center experimental area
1112: Entered parking area at center
1115: Went out tunnel and closed the shutter of the tunnel entrance.
Operators name: Hirose, Nakagaki
Shift time: 9-17 (JST)
Check Items:
VAC: No issues were found.
CRY cooler: No issues were found.
Compressor: No issues were found.
IFO state (JST):
09:00 Due to the work done the previous day,
OBS INTENT was "OFF", INTERFEROMETER STATUS was "CALIB NOT READY", and LENGTH SENSING CONTROL was "OBSERVATION".
14:37 Ushiba-san turns "ON" OBS INTENT and is now in "OBSERVING" status. (Klog #34540)
17:00 This shift was finished. The status was "OBSERVING".
