Reports of 31916
MIF (General)
Shu-Wei Yeh - 2:54 Sunday 06 July 2025 (34474) Print this report
Noise Subtraction from KAGRA O4c Data Using ICA

[Shu-Wei Yeh, Chia-Jui Chou]

We applied ICA to clean KAGRA strain data from 1435106958 to 1435111758 (00:49–02:09 UTC, June 28, 2025) [Ref. klog 34400], using a cleaning duration of 1200 seconds. The segment was divided into four intervals for testing noise subtraction: 1435106958, 1435108158, 1435109358, and 1435110558. Here, we present the results for the interval starting at 1435108158.

The central frequencies (f_c), step-by-step improvements, and the overall inspiral range improvement are listed below. We observed effective noise subtraction in the June 28 data.

For the remaining denoising results and the list of witness channels used, please refer to the attached slides here,  JGW-G2516738-v2.

The next step is testing DeepClean's performance on the June 28 data.

f_c [Hz] Incremental (per-band) improvement [%] Cumulative improvement [%]
60 0.139 0.139
120 0.444 0.583
162 0.263 0.847
240 0.118 0.966
300 0.027 0.994
326 0.247 1.243
360 0.002 1.245
420 0.004 1.250
480 0.009 1.259
515 0.073 1.333
540 0.010 1.343
600 0.001 1.344
660 0.001 1.346
780 0.002 1.348
840 0.001 1.348

 

Images attached to this report
OBS (Summary)
hiromi.yasui - 17:16 Saturday 05 July 2025 (34473) Print this report
Operation Shift Summary

Operators: Hido, Yasui

Shift time: 9:00-17:00 JST

Check Items: There was no issue on the regular check of VAC, CRY, and TEMP.

(Ikeda-san’s script for comparing cryocooler temperatures was very helpful!)

IFO state (JST):

9:00 OBSERVING

12:33 LOCKLOSS

(While recovering the IFO, there was an earthquake near the Tokara Islands around 12:50.)

13:45 OBSERVING

17:00 OBSERVING

 

OBS (General)
takahiro.sawada - 20:16 Friday 04 July 2025 (34472) Print this report
Comment to Set observing bit (34099)
We turned on the OBS INTENT around 18:53 JST, after Friday CAL.
OBS (SDF)
takahiro.yamamoto - 19:09 Friday 04 July 2025 (34469) Print this report
Comment to Changes of observation.snap during O4c (34169)

K1CALCS

Channels in JGW-L2314962

It's related to klog#34468
They were updated based on the latest value of optical gain of DARM and ETMX actuator efficiencies in klog#34466.

Changes were accepted on observation.snap (Fig.1), down.snap (Fig.2), and safe.snap (Fig.3).
Finally, numerical rounding errors were reverted after re-loading observation.snap as shown in Fig.4.

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CAL (General)
takahiro.yamamoto - 19:08 Friday 04 July 2025 (34468) Print this report
Comment to Weekly calibration on 7/4 (34466)

I updated line tracking parameters (JGW-L2314962).

All detected changes are coming from the planned commissioning activities.
- Chagens in foton Fig.1 are related to klog#34466 (k1calcs).
- No changes in guardian (Fig.2).
- Changes in SDF tables shown in Fig.3-4 are related to this klog#34467, klog#34469 (k1calcs), and klog#34464 (k1calex, k1caley).
- No changes in the model (Fig.5).

Finally, I raised CFC_LACTCH and IFO guardian moved from CALIB_NOT_READY to READY.

Images attached to this comment
CAL (General)
Shingo Hido - 18:28 Friday 04 July 2025 (34466) Print this report
Weekly calibration on 7/4

CAL group

We did the calibration measurements and update the prameters.

Estimated parameters in the Pre-maintenance measurements are as follows.
 H_etmxtm = 3.840823152e-14@10Hz ( 0.04% from previous measurements)
 H_etmxim = 1.546766367e-14@10Hz  ( 0.70% from previous measurements)
 Optical_gain =  2.114710228e12         ( -0.69% from previous measurements)
 Cavity_pole = 18.100765775 Hz           ( -0.15% from previous measurements)

Previous values are listed in klog#34424.

Fig. 2 and Fig.4 shows the ratio of the sensing functions estimated.

Estimated parameters in the Post-maintenance measurements are as follows.
 H_etmxtm = 3.839861341e-14 @10Hz ( -0.03% from pre-maintenance measurements)
 H_etmxim =  1.484142700e-14@10Hz ( -4.05 % from pre-maintenance measurements)
 Optical_gain =  2.126367691e12         ( 0.55 % from pre-maintenance measurements)
 Cavity_pole = 18.041050536 Hz           ( -0.33% from pre-maintenance measurements)

Images attached to this report
Comments to this report:
takahiro.yamamoto - 19:08 Friday 04 July 2025 (34468) Print this report

I updated line tracking parameters (JGW-L2314962).

All detected changes are coming from the planned commissioning activities.
- Chagens in foton Fig.1 are related to klog#34466 (k1calcs).
- No changes in guardian (Fig.2).
- Changes in SDF tables shown in Fig.3-4 are related to this klog#34467, klog#34469 (k1calcs), and klog#34464 (k1calex, k1caley).
- No changes in the model (Fig.5).

Finally, I raised CFC_LACTCH and IFO guardian moved from CALIB_NOT_READY to READY.

Images attached to this comment
OBS (SDF)
dan.chen - 18:25 Friday 04 July 2025 (34467) Print this report
Comment to Changes of observation.snap during O4c (34169)

k1calcs

I accepted the following SDFs in observation.snap, down.snap, and safe.snap.
This is caused by calibration measurements.

Images attached to this comment
CAL (Pcal general)
dan.chen - 17:32 Friday 04 July 2025 (34465) Print this report
WSK calibration at UToyama

Date: 2025/07/04

Member: Misato Onishi, Keisuke Sakanoue

We performed our usual WSK calibration at UToyama.

The results look no problem.

Results

Case Alpha (Main Value) Alpha (Uncertainty)
Front WSK, Back GSK -0.911184 0.000188
Front GSK, Back WSK -0.908968 0.000122

Comparison with Previous Results

Comparing with previous results, no significant issues were found.
Attached graph is the result summary including the latest measured data.

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OBS (SDF)
dan.chen - 16:40 Friday 04 July 2025 (34464) Print this report
Comment to Changes of observation.snap during O4c (34169)

We accepted the SDFs reported on klog34463.

CALEX, CALEY

K1:CAL-PCAL_{EX,EY}_TCAM_{MAIN,PATH1,PATH2}_{X,Y}

Images attached to this comment
CAL (Pcal general)
dan.chen - 16:38 Friday 04 July 2025 (34463) Print this report
Pcal Parameter Update Report

A CAL Tcam session was performed to obtain beam position information necessary for Pcal. The parameters have already been updated, and SDF has alreadly been accepted.

Operator: Shingo Hido, DanChen

Update Time: 2025/07/04 16:16:28

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EX_TCAM_PATH1_X 3.31876 mm 3.46849 mm +0.14973 mm
K1:CAL-PCAL_EX_TCAM_PATH1_Y 62.68873 mm 62.58533 mm -0.10340 mm
K1:CAL-PCAL_EX_TCAM_PATH2_X -0.12871 mm 0.06867 mm +0.19738 mm
K1:CAL-PCAL_EX_TCAM_PATH2_Y -63.44419 mm -63.66836 mm -0.22417 mm

Update Time: 2025/07/04 16:17:06

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EX_TCAM_MAIN_X 3.48993 mm 3.73403 mm +0.24411 mm
K1:CAL-PCAL_EX_TCAM_MAIN_Y 12.19048 mm 12.20820 mm +0.01772 mm

Update Time: 2025/07/04 16:17:41

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EY_TCAM_PATH1_X 1.19957 mm 0.92272 mm -0.27685 mm
K1:CAL-PCAL_EY_TCAM_PATH1_Y 64.22827 mm 63.96127 mm -0.26700 mm
K1:CAL-PCAL_EY_TCAM_PATH2_X -0.41650 mm -0.71031 mm -0.29381 mm
K1:CAL-PCAL_EY_TCAM_PATH2_Y -70.59431 mm -70.49072 mm +0.10359 mm

Update Time: 2025/07/04 16:18:19

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EY_TCAM_MAIN_X 8.77452 mm 6.31424 mm -2.46029 mm
K1:CAL-PCAL_EY_TCAM_MAIN_Y -3.34206 mm -3.21271 mm +0.12935 mm

 

CAL (General)
dan.chen - 16:17 Friday 04 July 2025 (34462) Print this report
EYA Tcam Stoppage During Pcal Tcam Session

With Shingo Hido, Hirotaka Yuzurihara

This afternoon, during the Pcal Tcam session, the EYA Tcam stopped and could not capture images. An error message was displayed on the screen: "An error occurred while capturing frame for ZWO ASI294MC."

As a countermeasure, "Recovery" and "Force" under the "Recovery" menu were executed, but a GRD timeout error occurred and recovery was unsuccessful.
After manually setting the GRD to "DOWN," executing "Recovery" - "Recovery" restored normal operation.

If the same error occurs in the future, setting the GRD to "DOWN" before attempting recovery may be an effective procedure.

Images attached to this report
FCL (Electricity)
nobuhiro.kimura - 14:03 Friday 04 July 2025 (34461) Print this report
Inspections for distribution board repair (PLX-127 and PLX-129)

Kimura and Furuyado (Shinkoh Denki)
 In order to repair the insulation defects caused by rust in the distribution board PLX-129,
we confirmed the replacement procedure and the on-site situation.
(See attached photos.)
Based on the results of the check, a distribution board repair plan will be prepared and the repair will be implemented.

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VIS (EX)
dan.chen - 12:42 Friday 04 July 2025 (34460) Print this report
ETMX IP Offload

With Takahumi USHIBA

Purpose and Overview

  • Due to tidal motion, an offset gradually accumulates in the feedback signal applied to the IP (Inverted Pendulum).
  • The purpose of this work was to offload this offset before the IP feedback signal saturates.
  • Because there is LPY coupling, the offloading causes a drift in the PY alignment of ETMX. Therefore, after offloading, the PY alignment was manually adjusted to maximize the green transmission, and the good oplev setpoints were updated accordingly.

Procedure

  1. Request RESET_ASC_FEEDBACK and DOWN to LSC_LOCK
    This was necessary to correct the alignment and set all suspensions to LOCK_ACQUISITION.
  2. Monitoring TM Oplev and Green Transmission
    TM oplev signals and green transmission were monitored during the procedure.
  3. ETMX-IP-ISC2LVDT Filter Bank
    Opened the filter bank of ETMX-IP-ISC2LVDT.
    The objective was to bring the output signal to zero.
    Set the ramp time to 100 seconds.
    Set the gain to 0.
    Waited for 100 seconds.
    Observed that the green transmission decreased (flash level dropped to around 0.4), which was too low for locking.
    Pressed Clear History.
    Restored the ramp time to 3 seconds.
    Restored the gain to 1.
  4. Recovery of Green Transmission by Adjusting TM Oplev Setpoints
    Manually adjusted TM oplev setpoints referencing the green transmission value.
    After adjustment, the green transmission recovered to approximately 0.9.
  5. Updating Good Oplev Setpoints
    Updated oplev setpoints to reflect the adjustments made during this work today:
    Pitch: 37.2 → 39.1
    Yaw: –9.26 → –1.76
  6. Lock Trial
    Performed a lock acquisition trial.
    Successfully achieved lock.
MIF (General)
takaaki.yokozawa - 11:05 Friday 04 July 2025 (34459) Print this report
Comment to Finesse measurement Yarm 20250704 (34457)
In current Finesse measurement, there are one thing
that even the target rotation of the PSL_HWP = 173 (or 179), the actual value of PSL_HWP became 174 (or 180), sometimes happened.

The Finesse value may not be affected by the beam power, but it would be better to be fixed in future.
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MIF (General)
takaaki.yokozawa - 10:58 Friday 04 July 2025 (34458) Print this report
Comment to Finesse measurement Yarm 20250704 (34457)
I performed the same measurement with higher IMC output power.
The finesse value slightly increased, but within the error.

DATE : 2025/07/04 01:24 UTC
ARM : Y
TEMP ITM : 39.1
TEMP ETM : 58.9
NUM : 10
IFO REFL HWP : 152.0
PSL HWP : 179.0
IMC POWER : 7.3
VALUE : 1271.8
ERROR : 10.5

Measured data is stored to /users/Commissioning/data/Finesse/Yarm/20250704-012438
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MIF (General)
shoichi.oshino - 10:20 Friday 04 July 2025 (34457) Print this report
Finesse measurement Yarm 20250704
DATE : 2025/07/04 00:53 UTC
ARM : Y
TEMP ITM : 39.5
TEMP ETM : 58.9
NUM : 10
IFO REFL HWP : 152.0
PSL HWP : 173.0
IMC POWER : 5.0
VALUE : 1258.9
ERROR : 13.8

Measured data is stored to /users/Commissioning/data/Finesse/Yarm/20250704-005311
Images attached to this report
Comments to this report:
takaaki.yokozawa - 10:58 Friday 04 July 2025 (34458) Print this report
I performed the same measurement with higher IMC output power.
The finesse value slightly increased, but within the error.

DATE : 2025/07/04 01:24 UTC
ARM : Y
TEMP ITM : 39.1
TEMP ETM : 58.9
NUM : 10
IFO REFL HWP : 152.0
PSL HWP : 179.0
IMC POWER : 7.3
VALUE : 1271.8
ERROR : 10.5

Measured data is stored to /users/Commissioning/data/Finesse/Yarm/20250704-012438
Images attached to this comment
takaaki.yokozawa - 11:05 Friday 04 July 2025 (34459) Print this report
In current Finesse measurement, there are one thing
that even the target rotation of the PSL_HWP = 173 (or 179), the actual value of PSL_HWP became 174 (or 180), sometimes happened.

The Finesse value may not be affected by the beam power, but it would be better to be fixed in future.
Images attached to this comment
CAL (General)
hirotaka.yuzurihara - 10:10 Friday 04 July 2025 (34453) Print this report
TCam photo session 20250704
MIF (General)
shoichi.oshino - 9:59 Friday 04 July 2025 (34456) Print this report
Finesse measurement Xarm 20250704
DATE : 2025/07/04 00:21 UTC
ARM : X
TEMP ITM : 93.2
TEMP ETM : 38.4
NUM : 10
IFO REFL HWP : 152.0
PSL HWP : 173.0
IMC POWER : 4.9
VALUE : 1364.5
ERROR : 9.6

Measured data is stored to /users/Commissioning/data/Finesse/Xarm/20250704-002159
Images attached to this report
OBS (SDF)
dan.chen - 9:42 Friday 04 July 2025 (34455) Print this report
Comment to Changes of observation.snap during O4c (34169)

We accepted the SDFs reported on klog34454.

CALEX, CALEY

K1:CAL-PCAL_{EX,EY}_TCAM_{MAIN,PATH1,PATH2}_{X,Y}

Images attached to this comment
CAL (Pcal general)
dan.chen - 9:24 Friday 04 July 2025 (34454) Print this report
Pcal Parameter Update Report

A CAL Tcam session was performed to obtain beam position information necessary for Pcal. The parameters have already been updated, and SDF has been accepted.

Operator: Shingo Hido, Dan Chen

Update Time: 2025/07/04 09:03:40

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EX_TCAM_PATH1_X 3.26544 mm 3.31876 mm +0.05332 mm
K1:CAL-PCAL_EX_TCAM_PATH1_Y 62.90884 mm 62.68873 mm -0.22011 mm
K1:CAL-PCAL_EX_TCAM_PATH2_X 0.13975 mm -0.12871 mm -0.26846 mm
K1:CAL-PCAL_EX_TCAM_PATH2_Y -63.65513 mm -63.44419 mm +0.21094 mm

Update Time: 2025/07/04 09:04:08

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EX_TCAM_MAIN_X 3.47421 mm 3.48993 mm +0.01572 mm
K1:CAL-PCAL_EX_TCAM_MAIN_Y 12.21899 mm 12.19048 mm -0.02850 mm

Update Time: 2025/07/04 09:04:49

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EY_TCAM_PATH1_X 0.79868 mm 1.19957 mm +0.40089 mm
K1:CAL-PCAL_EY_TCAM_PATH1_Y 64.20560 mm 64.22827 mm +0.02267 mm
K1:CAL-PCAL_EY_TCAM_PATH2_X -0.69337 mm -0.41650 mm +0.27687 mm
K1:CAL-PCAL_EY_TCAM_PATH2_Y -70.20718 mm -70.59431 mm -0.38713 mm

Update Time: 2025/07/04 09:05:15


 
EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EY_TCAM_MAIN_X 6.50798 mm 8.77452 mm +2.26654 mm
K1:CAL-PCAL_EY_TCAM_MAIN_Y -3.22455 mm -3.34206 mm -0.11751 mm
MIF (General)
takaaki.yokozawa - 9:06 Friday 04 July 2025 (34452) Print this report
Comment to Finesse measurement Xarm 20250613 (34184)
The IMC output power vs PSL HWP rotation was different from previous Finesse measurement.
Should we keep sam IMC output power or PSL_HWP value?
Fig.1. 13th June
Fig.2. Today 4th July
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MIF (General)
dan.chen - 5:18 Friday 04 July 2025 (34451) Print this report
Comment to Violin mode Q estimation (34436)

After checking the updated PDF, it seems that all three peaks in question (1st No.2, No.6, and No.9) have issues in the fitting results. I plan to adjust the settings to use a longer FFT length and reanalyze them.

OBS (Summary)
dan.chen - 16:36 Thursday 03 July 2025 (34450) Print this report
Comment to Operation shift summary (34449)

output from check_IFO_status.py

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OBS (Summary)
dan.chen - 16:34 Thursday 03 July 2025 (34449) Print this report
Operation shift summary

Operators

Takaaki Yokozawa, Hiroshi Takaba, Dan Chen

Shift Time

9:00–17:00 JST

Check Items

  • VAC: No issues were found.
  • CRY cooler: No issues were found.
  • Compressor: No issues were found.
  • OBS INTENT: The OBS INTENT was ON throughout the shift.

Note

  • There was a period when the interferometer did not lock for an extended time. Just before the unlocked duration reached one hour, an earthquake occurred.
  • After that, earthquakes continued to occur sequentially.
  • Related klog: klog34448
Comments to this report:
dan.chen - 16:36 Thursday 03 July 2025 (34450) Print this report

output from check_IFO_status.py

Images attached to this comment
MIF (General)
takafumi.ushiba - 15:28 Thursday 03 July 2025 (34448) Print this report
Failure of auto recovery of the IFO

Today, IFO could not be recovered to even RF-locked state automatically by the guardian for a long time (more than 1 hour).
Since this is the first time that IFO could not be recovered automatically during O4c observing run, I investigated the reason.

Figure 1 shows the ETMX OpLev values before and after the final lock of the interferometer.
Though pitch and yaw values were recorded well, LS oplev values were changed a lot.
This is probably due to the DARM control feedback signals, so it is hard to control.

To avoid the same instability, what we can do is
1. Record LS Oplev values of ETMX and move suspensions so that LS OpLev values becomes close to the one before lockloss.
2. Move ETMX angle during the lock acquisition so that arm alignment becomes good, for example by ADS using GRX.
3. Decouple L2P and L2Y more to reduce the misalignment when LS OpLev values are changed.

Since there are several advantages and disadvantages in the above 3 countermeasures, we need to consider what kind of treatment should be done.

Images attached to this report
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