Reports of 26607
CRY (Cryostat IX)
masahide.tamaki - 17:13 Tuesday 19 March 2024 (28906) Print this report
Comment to viewport cleaning (28788)

[Uchiyama, Yuzurihara, Ishikawa, Tamaki]

I reinstalled 6 viewports which were removed & cleaned yesterday (MN +X+Y outer / inner・MN -X+Y outer / inner・TM -X+Y outer / inner) and last week (TM -X-Y outer / inner).

And also PF -X+Y inner was removed (so PF -X+Y outer・ PF -X-Y outer / inner remain without being cleaned).

VIS (EX)
takaaki.yokozawa - 16:41 Tuesday 19 March 2024 (28905) Print this report
MN oplev beampath check for ETMX
[Ushiba, Oshino, Yokozawa]

After the earthquake stop finalization work, we checked the beam path for MN ETMX oplevs.
For all beam path, "No" touching to wires, not edge of viewport, so MN oplev seems healthy (for beam path).
I am summarizing the pictures now, I will submit them later.

VIS (EY)
takafumi.ushiba - 16:28 Tuesday 19 March 2024 (28903) Print this report
ETMY ALIGNED state recovery

As reported in klog28898, ETMY OpLev beam was not on QPDs even in ALIGNED state, so I tweeked the ETMY alignment and recovered ALIGNED state.
For the recovery, I changed ETMY MN OPTICALIGN yaw offsets from -4650 cnts to +2800 cnts.
I also changed IPL offset to 700 um so that ETMY length sensing OpLev signals become similar value just before the earthquake.

Note:
ETMY H3 photosensor signals became glitch again, so I turned off MN DAMP T filter not to kick the suspension, so we need to repair it.

CAL (YPcal)
dan.chen - 15:15 Tuesday 19 March 2024 (28902) Print this report
Shutter install

With Takase-san

We put the shutter back in its original position.
This shutter was removed when we measured the power budget.

We checked the beam positions before/after the beam shutter are almost at the center of the shutter aperture.

Current situation of Pcal-Y:

  • We confirmed that the guardian can reach at TX_CALIBRATION state.
  • The beam dumpers are set at the trapezoid area for both beams.
  • The key of the laser source is OFF = you can not turn ON the laser remotely.
Images attached to this report
VIS (MCE)
tatsuki.washimi - 14:01 Tuesday 19 March 2024 (28901) Print this report
Installation of side stoppers for MCe

[Hirata, Washimi]

This morning, we installed the side stoppers for the MCe suspensions. 

  1. Fixed the mirror with the lower stoppers (HR/AR surface).
  2. Removed the current top stopper plate and adapter blocks.
  3. Installed the new adapter between the frames and the stopper plate.
  4. Attached the side guide plates. (Fig.1)
  5. Assembled the new stopper plate. The stoppers were set vertically. (Fig.2)
  6. Inserted the new stopper plate to the upper position of the guide.
  7. Rotated the stoppers to the 45° angle. (Fig.3)
  8. Moved down the stopper plate to the lower position of the guide.
  9. Adjusted the height of the stoppers.
  10. Removed the guide plate. (Fig.4)
  11. Released the mirror and adjusted the gaps of all stoppers to ~2mm.

These works were finished (within ~1h), but after that, the oplev beam was moved a lot in the yaw.

We tried to align the mirror with Takahashi-san and Ikeda-san, but during this work, one magnet (upper right viewed from the HR side) was fallen. (Fig.5)
Details will be reported later as another log entry.

Images attached to this report
CAL (XPcal)
dan.chen - 7:51 Tuesday 19 March 2024 (28899) Print this report
Comment to Alignment recovery of Pcal-X (28796)

I analyzed the Tcam figure to see the beam position change (1) after the lunch time yesterday(3/18), and (2) morning today(3/19).

The movement of BEAM seems to have subsided over time.

  Beam movement on ETM [mm] Rate[mm/h] Graph
(0) 3/18 lunch-time for 1.5h ~2mm 1.3 -
(1) 3/18 afternoon for 2h ~0.6mm 0.3 fig_001.png
(2) 3/19 morning for 2h 0mm (could not see the change) (0) fig_002.png

My impression is that there is a change in alignment immediately after using the pico motor, which settles down over time.

Currently, there is no variation that can be captured by Tcam in 2 hours, but we would like to monitor for a few days.

Images attached to this comment
VIS (EY)
takaaki.yokozawa - 6:40 Tuesday 19 March 2024 (28898) Print this report
Trial of GRY signal search from ETMY
I tried to search the GRY beam at POS from ETMY, but even in aligned state of ETMY, almost all oplev values was almost zero.
We need to check hardware part.
Images attached to this report
VIS (PRM)
takaaki.yokozawa - 6:08 Tuesday 19 March 2024 (28897) Print this report
Oplev path check PRM
This is 18th March work.
I checked the beam path (and ghost beams) for PRM oplev.

We concluded there is no serious damage in PRM oplev.

- The beam position of the steering mirror for length sensing QPD was slightly right
Images attached to this report
VIS (PR3)
takaaki.yokozawa - 6:08 Tuesday 19 March 2024 (28896) Print this report
Oplev path check PR3
This is 18th March work.
I checked the beam path (and ghost beams) for PR3 oplev.

We concluded there is no serious damage in PR3 oplev.

- The beam position of the steering mirror for length sensing QPD was slightly lower and right
Images attached to this report
VIS (PR2)
takaaki.yokozawa - 6:05 Tuesday 19 March 2024 (28895) Print this report
Oplev path check PR2
This is 18th March work.
I checked the beam path (and ghost beams) for PR2 oplev.

We concluded there are no serious damage in PR2 oplev, but I leave several messages.

1. PR2 injection part
This is already well known, Injection part of PR2 oplev is quite edge of viewport, that is not changed from before earthquake.

2. PR2 steering mirror
The beam position on PR2 steering mirror in vac was slightly lower, I don't know from when.

3. PR2 oplev beam after PR2 mirror
We found the (relatively stronger) ghost beam, and this ghost beam is back to PR2 oplev board. But this ghost beam may not affect anything to PR2 oplev.
(And we found the jig of beam damper (but no beam damper itself) on the beam path of this ghost beam)

4. Beam position on lense for length sensing QPD
The beam position on lense was slightly left from center ("left" from the view of the beam direction )

5. Steering mirror 1 for length sensing QPD
The beam position of steering mirror 1 was upper and left

6. Steering mirror 2 for length sensing QPD
The beam position of steering mirror 2 seems almost center
Images attached to this report
VIS (MCF)
ryutaro.takahashi - 21:02 Monday 18 March 2024 (28892) Print this report
Installation of side stoppers

[Hirata, Washimi, Ikeda, Takahashi]

We installed the side stoppers to the MCi and MCo suspensions. The width of the slit on the side stopper plates (figure) was 4mm (should be 6mm). We made the width wider using a milling machine. Installation procedure was as follows in both MCi and MCo suspensions. The photos will be attached later.

  1. Fixed the mirror with the lower stoppers.
  2. Replaced the adapter between the frame and the stopper plate.
  3. Attached the guide plate. 
  4. Assembled the stopper plate. The stoppers were set vertically.
  5. Inserted the stopper plate to the upper position of the guide.
  6. Rotated the stoppers to the 45° angle.
  7. Moved down the stopper plate to the lower position of the guide.
  8. Adjusted the height of the stoppers.
  9. Removed the guide plate.
  10. Released the mirror and adjusted the gaps of all stoppers to ~2mm.
  11. Aligned the mirror with the pico-motors.
Images attached to this report
Comments to this report:
tatsuki.washimi - 20:48 Monday 18 March 2024 (28893) Print this report

MCi photograph

Images attached to this comment
tatsuki.washimi - 20:54 Monday 18 March 2024 (28894) Print this report

MCo photograph

Images attached to this comment
VIS (MCF)
tatsuki.washimi - 20:54 Monday 18 March 2024 (28894) Print this report
Comment to Installation of side stoppers (28892)

MCo photograph

Images attached to this comment
VIS (MCF)
tatsuki.washimi - 20:48 Monday 18 March 2024 (28893) Print this report
Comment to Installation of side stoppers (28892)

MCi photograph

Images attached to this comment
VIS (EX)
takafumi.ushiba - 19:44 Monday 18 March 2024 (28891) Print this report
Offload ETMX pitch and yaw signals by using pico and stepper motors

This is for the finalization work tomorrow.

I offloaded BFY, MNY, and MNP signals by using F0Y stepper motor, BFY pico motor, and MN pitch stepper motor, respectively.
Now, ETMX OpLev beams hit on their QPDs at SAFE state.

I also change IPL setpoint so that TML OpLev signals are close to zero when ETMXis in ALIGNED state.

VIS (MCF)
takafumi.ushiba - 18:45 Monday 18 March 2024 (28890) Print this report
Comment to Health check of MCO (28672)

As well as MCI, I measured TFs of MCO for the helth check.
Figure 1 to 7 show the results.

Since current good alignment is slightly far from the OpLev center (normalized value is about 0.6), the yaw TF have slightly low coherence at high frequencies but it's not so problematic.
Also, the TFs are totally different from the reference but they should be fine because MCO had an issue before and current TF shapes are very similar to those of MCI and MCE.
In addition, low frequency coherence is low as well as MCI but it is also not a serious problem.

Before the final check, it is better to perform QPD centering of OpLevs for finalization before vacuum evacuation and better health check.

Images attached to this comment
VIS (MCF)
takafumi.ushiba - 18:34 Monday 18 March 2024 (28889) Print this report
Comment to Health check of MCi (28232)

I measured TFs of MCI after installation of new side stopper (it will be posted later, hopefully).
Figure 1 to 7 show the result.

All TFs seem healthy but have low coherence at low frequencies.
One possible reason is air flow due to the aluminum cover, which just closed MCF flange before but is an aluminum tube to connect MCF to MCE now.

Anyway, suspension TFs themselves seem fine, so we can proceed the closure process.

Images attached to this comment
CAL (XPcal)
dan.chen - 17:50 Monday 18 March 2024 (28888) Print this report
Comment to Alignment recovery of Pcal-X (28796)

Date: 2024/3/18

With Takase-san

Abstract

  • We found the side flanges (especially +y side = wall side) affected Pcal alignments. The condition (open or close) can change beam positions on RxPD by ~5mm.
  • We checked the screws fixing the mirrors just before the ETM. They were tightly screwed enough.
  • Additionally, we suspect that pico motor operations (~heat?) may be affecting the alignment.
    • Just after the picomotor operations, the beams moved ~2mm on the ETM during the lunch hour (~1.5h), and then they moved about 0.5mm/2h after that.

Details

  • Changed ISOLATING threshold of ETMX suspension from 20 to 100, and requested ALIGNED.
  • Checked the ETM position on Tcam picture. -> No change from the previous data.
  • Checked the Pcal beam position on ETM -> they were about 5mm higher than the design position.
  • We opened Rx side flange -> beam on RxPD did not change.
  • We opened Tx side flange -> beam positions on RxPD changed.
  • Checked the effect of the flanges condition on the beam position at RxPD. Both beams were about the same position on RxPD.
Relative position on RxPD
x[mm] y[mm]
Flange open 90 110
Flange close 85 114
  • With the picomotors in EXA, we adjusted beam position on ETM with closing the flanges, and took a record for the beam positions on the ETM.
  • (Lunch time ~ 1.5h including move and other works. Picomoter power switch was ON during the lunch time)
  • Checked the beam positions on ETM without any change. -> the beams changed by about 2mm.
Estimated beam positions on ETM [mm] Path 1 x Path 1 y Path 2 x Path 2 y
Before Lunch time (~1.5h) 0.2 0.8 0.8 2.1
After Lunch time -0.5 2.2 0.5 4.0
  • Adjusted beams with short time and turned OFF the picomotors.
  • Monitored the beam positions for 2 hours.
Estimated beam positions on ETM [mm] Path 1 x Path 1 y Path 2 x Path 2 y
Adjusted after the lunch time 1.3 -1.7 1.7 -1.5
2 hours after the end of lunch time 0.9 -1.2 1.2 -1.0
  • Note that it is difficult for the beam position estimation script to accurately estimate the positions by sub-milimater.
  • Consider the above results, we think the Pico-motor operations may have affected alignment. (Effect of thermal?)
  • We will check the alignment tomorrow morning again. After that we will turn OFF the Pcal-X laser for other works.

 

VAC (IXA)
nobuhiro.kimura - 17:01 Monday 18 March 2024 (28887) Print this report
Closed IXA flange
[Kimura and M. Takahashi]
We closed the aisle side flange of IXA.
 (See attached photo)
The elastomer seal was reused.
The flange claw clamps were tightened in steps with tightening torques of 20, 40, and 60 Nm using a torque wrench.
Images attached to this report
VAC (Tube X)
nobuhiro.kimura - 16:56 Monday 18 March 2024 (28886) Print this report
Set up a new pressure sensor for X-arm interlock
[Kimura and M. Takahashi]
We installed a new pressure sensor for interlocking on the X-arm side just below GVetmx.
(See attached photo)
Installed new pressure sensor is not in operation yet.
It needs vacuum leak test and discuss to connect X-arm vacuum interlock circuit.
Images attached to this report
IOO (IMC)
kenta.tanaka - 16:33 Monday 18 March 2024 (28883) Print this report
IMC alignment after Noto earthquake

Ushiba, Tanaka

### Abstract

We aligned IMC and confirmed the TEM00 flash with p-pol beam. Now we set MC mirrors at their good alignment without OPTICALIGN.

### What we did

  • First, we rotated the PSL HWP to decrease the output power from PSL to 0.18W and we installed the HWP in front of the last periscope to change the polarization from s-pol to p-pol. (Before the installation, we confirmed the MCE chamber was closed with aluminum foils not to resonate the s-pol beam in IMC.)
  • Then we removed the aluminum foils around MCE. we restored the MCI alignment with pico-motors at the good alignment before the earthquake.
  • We aligned IMC with MCO and MCE OPTICALIGN to minimize the REFL power and to hit the beam on the nominal position as refer to the camera pattern.
  • Now, we confirmed the TEM00 flash in TRANS camera. (see attached Movie)
  • After then, we offloaded from OPTICALIGN to their pico-motors at the current good alignment.

### Note

We left the HWP in front of the periscope.

Non-image files attached to this report
CRY (Cryostat IX)
masahide.tamaki - 16:11 Monday 18 March 2024 (28885) Print this report
Comment to viewport cleaning (28788)

[Miyoki, Yuzurihara, Ishikawa, Tamaki]

First, we removed the 6 viewports (MN +X+Y outer / inner・MN -X+Y outer / inner・TM -X+Y outer / inner).
Then, they were cleaned up along with two that had been previously removed (TM -X-Y outer / inner・klog28838).

Basically, they could be cleaned up as same as the original post, but TM -X+Y inner had a small mark which could not be removed (Fig.1).

►Cleaned viewports have not been reinstalled yet.
►The viewports for PF oplev have not been removed yet.

Images attached to this comment
VIS (General)
takaaki.yokozawa - 10:52 Monday 18 March 2024 (28882) Print this report
Comment to Check the available of ALIGNED state for Type-A suspension (28881)
After the Takahashi-san's IP offload work (maybe report later), we can confirmed to set the ALIGNED state for ETMY
VIS (General)
takaaki.yokozawa - 9:57 Monday 18 March 2024 (28881) Print this report
Check the available of ALIGNED state for Type-A suspension
I checked the availability of requesting the ALIGNED state for Type-A suspensions

ITMX : OK by changing the threshold of RMS(Isolate 20->100)
ETMX : OK by changing the threshold of RMS(Isolate 20->100)
ITMY : OK by changing the threshold of RMS(Isolate 20->100)
ETMY : No, some control error in IP control during isolating state
Comments to this report:
takaaki.yokozawa - 10:52 Monday 18 March 2024 (28882) Print this report
After the Takahashi-san's IP offload work (maybe report later), we can confirmed to set the ALIGNED state for ETMY
MIF (General)
takaaki.yokozawa - 10:21 Saturday 16 March 2024 (28880) Print this report
Comment to Trial of the GRX flash search (28860)
When I performed to set the aligned state to PR2, PR3 and ETMX (ITMX was safe state), we can see several peaks in
K1:ALS-X_ARM_REFL_OUT16
(We referred the klog17428)
Current set oplev value of ETMS was
P : 31.3
Y : -2.1

1. When I turned off GRX shutter, we cannot see those spike like signal.
2. When I checked the signal with PAY_FLOAT state, those peaks appeared only in the range of
12 < pitch < 38, 18 < yaw< 25 (Fig.1.)
3. I could not request ITMX to mis-aligned state, but current ITMX TM oplev was out of range, so I believe ITMX was mis-aligned
4. When I requested the ETMX state to safe with aligned state of PR2 and PR3, those peaks also disappeared, so I confirmed this spike signal may not come from ITMX
5. It was difficult to see the reflect beam in ITMX TCam

Anyway, ETMX alignment seems good from my eye.
Images attached to this comment
DGS (General)
takahiro.yamamoto - 2:39 Saturday 16 March 2024 (28879) Print this report
Update of cds workstations was postponed
Screen layout settings were lost when the computer was restored in the middle of the maintenance work.
Though workstations could be recovered, the system update was postponed because the recovery took longer than expected.

-----
Somehow name assignment of the graphic ports have started to change randomly. GT730 has 4 HDMI ports. These port is sometimes labeled as HDMI-1, -2, -3, and -4. In another case they labeled as HDMI-5, -6, -7, and -8. Before today's trouble, monitor ports are always recognized same labels. So some kind of settings seemed to be rewritten by restoring today. Settings of display layout by xrandr and autorandr are managed by using the port labels and the layout settings didn't work with a probability of 50%.

Though I couldn't find a complete solution, better solution was available. According to my tests (I tried several-tens of reboots), labeling pattern was only 2 mentioned above. So I saved two pattern of display layout for different EDID information by using autorandr. If there are another pattern of port labeling, storing the same number of layout settings as a number of labeling patterns is not a realistic solution. If we will face such a case, it's better to re-install all workstations.
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