Reports of 33981
DGS (General)
takahiro.yamamoto - 22:43 Wednesday 18 March 2026 (36619) Print this report
Comment to Deployment of V2 IO-chassis and the front-end computer for ITMX (36572)
[Ikeda, Nakagaki, YamaT]

Finally, V2 IO chassis S2416127 was installed at U6-9 of IXV1 rack after removing V1 IO chassis S1807864.
ITMX is currently operated using a fully installed V2 IO chassis and new MTP optical fiber cabling.
This marks the first successful instance of a DGS hardware upgrade toward O5.

-----
IO chassis for ITMX was replaced from V1 to V2 in klog#36572. But V2 IO chassis was still put at the outside of IXV1 rack because V1 IO chassis was still left in IXV1 rack for easy and quick recovery to the old configuration. After then, we confirmed that ITMX can stay in LOCK_ACQUISITION stably with V2 IO chassis. So we removed the V1 IO chassis from the IXV1 rack and installed V2 IO chassis there, today. With this work completed, ITMX is now operated with V2 IO chassis and a new MTP fiber cable which are fully installed. ITMX now achieved final configuration for O5 and this is the first success of upgrading DGS hardware.

To reduce downtime by DGS upgrade after O5, it is important to do same upgrades on as many other racks as possible before O5. Currently, we plan to do it for ITMY during SRM replacement and for ETMX/ETMY after IR1. ~40 working days will be required only for a same work about remaining 20 front-ends (because of limitation on equipments, working space and conflict each other, parallel upgrades for multiple front-end is probably difficult). According to an experience in this time, fortunately, we can probably do same upgrade works in ~ 2 days per front-end with restoring a front-end operation every day during those 2 days. So, it might be a good idea to consider using the two-week period (two maintenance days) for same upgrade works on remaining front-ends also after the SRM replacement work.

By the way, V1 IO chassis was still left in IXV room and old IX1 front-end was also still in ICV rack (RFM board was stolen today for the next upgrade of ITMY). These equipments can return back to the mine or SK server room anytime though I'm not sure sufficient space in both server rooms.
VAC (Valves & Pumps)
nobuhiro.kimura - 20:15 Wednesday 18 March 2026 (36618) Print this report
Comment to Switching from TMP to Ion Pumps (36549)

[Kimura and M. Takahasi]

 On March 18, we switched  form TMP to the Ion pump of the #36 vacuum pump unit at the Y-end .

After the activation of the #36 Ion pump, we turned off the #36 TMP and dry pump

  

CRY (General)
nobuhiro.kimura - 20:03 Wednesday 18 March 2026 (36617) Print this report
Comment to Maintenance Work on the Duct-Shield Cryo-coolers for IXC and IYC was Completed (36605)

[Kimura and M. Takahashi]

 On March 18, we completed maintenance work on the duct-shield cryo-coolers for the  EYC.
We are planning to restart the duct-shield cryo-coolers starting March 23, which will also serve as a test run.

CRY (General)
nobuhiro.kimura - 20:01 Wednesday 18 March 2026 (36616) Print this report
Comment to Cryo-cooler Unit Maintenance Work (36134)

[Kimura and M. Takahashi]
 As part of maintenance work on the cryogenic cooling units, we removed two valve units from the radiation shield cryo-coolers (P-53 and P-55) of EYC.
The removed valve units were packaged and returned to the manufacturing plant, where they will be disassembled and inspected.

 We plan to remove the remaining valve units from the IXC, IYC, and EXC radiation shield cryo-coolers early next week.

CAL (XPcal)
dan.chen - 12:19 Wednesday 18 March 2026 (36615) Print this report
XPcal calibration

KAGRA Pcal-X updates (2026/03/18)

Workers: Kohei Mitsuhashi, Dan Chen

We performed monthly Pcal-X calibration on 2026/03/18.

After the calibration, we updated EPICS parameters related to the Pcal-X system. No issues were found.

EPICS Key Before After Δ (After − Before)
K1:CAL-PCAL_EX_1_OE_R_SET 0.98489 0.98417 -0.00072
K1:CAL-PCAL_EX_1_OE_T_SET 0.98489 0.98417 -0.00072
K1:CAL-PCAL_EX_1_PD_BG_RX_V_SET -0.00381 -0.00386 -0.00005
K1:CAL-PCAL_EX_1_PD_BG_TX_V_SET 0.00689 0.00602 -0.00087
K1:CAL-PCAL_EX_1_RX_V_R_SET 0.50206 0.50202 -0.00004
K1:CAL-PCAL_EX_2_INJ_V_GAIN 0.95148 0.95101 -0.00047
K1:CAL-PCAL_EX_2_OE_R_SET 0.97457 0.97404 -0.00053
K1:CAL-PCAL_EX_2_OE_T_SET 0.97457 0.97404 -0.00053
K1:CAL-PCAL_EX_2_PD_BG_TX_V_SET 0.00551 0.00519 -0.00032
K1:CAL-PCAL_EX_2_RX_V_R_SET 0.49794 0.49798 0.00004
K1:CAL-PCAL_EX_WSK_PER_RX_SET 1.48800 1.48915 0.00115
K1:CAL-PCAL_EX_WSK_PER_TX1_SET 0.52710 0.52744 0.00035
K1:CAL-PCAL_EX_WSK_PER_TX2_SET 0.38759 0.38799 0.00040

 

Images attached to this report
VIS (IY)
ryutaro.takahashi - 9:24 Wednesday 18 March 2026 (36614) Print this report
Offload of GAS filters

I offloaded the F0 and F1 GAS filters with the FRs.

PEM (Center)
takaaki.yokozawa - 9:03 Wednesday 18 March 2026 (36613) Print this report
First test of the ground motion at the new laser room
I measured the ground motion by the portable trillium compact system at the new laser room at Kamioka (neutrino) building during the last weekend.
Attached spectrum was around 16th 00:00:00(JST)
Compared from the klog36509,
- The trend of the XY and Z was different.
- Large peaks detected at 6 Hz in XY direction
- Above 10 Hz, the ground motion was larger than the KAGRA hokubu-kaikan 2F
- Due to the vibration from keisanki room at 1st floor?

Next , check the spectrum with traffic situation (track and so on)
Images attached to this report
CRY (General)
nobuhiro.kimura - 8:45 Wednesday 18 March 2026 (36611) Print this report
Comment to Maintenance Work on the Duct-Shield Cryo-coolers for IXC and IYC was Completed (36605)

[Kimura and Yasui]

Parts replaced during maintenance work
1. Absorber in the helium compressor
2. Filter unit at the supply side
3. Gas replacement inside the cold head in accordance with SHI work procedures
4. Disassembly and maintenance of the valve unit at the SHI factory
5. Gas replacement in the compressor and flexible tubing
(1) Helium gas used: G-1 grade
(2) Filling pressure: 14.8 bar

PEM (Center)
takaaki.yokozawa - 8:45 Wednesday 18 March 2026 (36612) Print this report
Comment to Tapping test at PSL room (36594)
Global trend
Similar shape in POW PMC OUT and IP QPD P,Y
large signal in IMMT1 trans if POW PMC OUT became large
Several different in IMC refl QPD 1 and 2
Distance dependence of the response of IP1, 2
1 inch : basically around 500 Hz had resonant frequency
2 inch : basically around 330 and 470 Hz have peaks
150 Hz(M18-1) and 210 Hz (M17) is special resonant frequency

Before the PMC
Relatively small signal in the IMC refl sensors
large peak at POW PMC OUT
340(M04’), 360(M3’) and 680(M04’) Hz may come from the 2 inch mirror before the PMC

After the PMC
M5 1 inch : some 520 Hz signal in IMC refl sensors, several peak in IP pitch signal
M6 1 inch : Quite large peak in 470 Hz in IMC refl sensors, IP peak except for QPD1 yaw ,Small peak in IMMT1 trans
M7 2 inch : some peak in 470 Hz in IMC refl, IP, ACC1, small peak in IMMT1 trans P>Y
M8 1 inch : Peak at 520 Hz in IMC refl and IP, DC QDP2 pitch largest
M9 1 inch : Peak in 510 Hz in various IMC refl (QPD1 larger), and IP (QPD1 larger), 2nd peak 560 Hz in several sensors
M10 1 inch : 490 Hz peaks in several sensors
M18-1 2 inch: large peak at 150 Hz, several peak in 295 and 440 Hz, 640 Hz
M12 2 inch : peak at 330 Hz, 485 Hz(shape different), 550 Hz
M13 1 inch : peak at 550 Hz
M14 1 inch : peak at 510 Hz
M17 2 inch : peak at 210 Hz, 337, 420, 640, 710 Hz
M18-2 2 inch : 337, 350, 550, 680 Hz
M19 2 inch : 365, 395 Hz
M20 2 inch : peaks in 320, 350 and 630 Hz
periscope upper : 450 Hz
periscope lower : 450 Hz
CAL (XPcal)
dan.chen - 7:45 Wednesday 18 March 2026 (36610) Print this report
Pcal-X beam position check

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, Kohei Mitsuhashi, Dan Chen

Update Time: 2026/03/18 07:41:38

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EX_TCAM_PATH1_X 0.07325 mm -0.87474 mm -0.94799 mm
K1:CAL-PCAL_EX_TCAM_PATH1_Y 66.15693 mm 66.37439 mm +0.21746 mm
K1:CAL-PCAL_EX_TCAM_PATH2_X 0.56752 mm -0.37755 mm -0.94507 mm
K1:CAL-PCAL_EX_TCAM_PATH2_Y -68.50339 mm -67.02710 mm +1.47629 mm

 

VIS (SR2)
kenta.tanaka - 0:39 Wednesday 18 March 2026 (36609) Print this report
Modification of rolloff filters of SR2 Payload local control

This work is continued from klog36589

## GAS control modification

According to yesterday's results related to GAS, there seem to be gain peaking at 3-4 Hz. So I reduced {F0,F1,BF} gains to -6dB. After that I measured their OLTFs when SR2 is in the LOCK_ACQUISITION state. Fig.1,2,3 show the results. Unfortunately, OLTF could not be measured well maybe due to the coupling between GAS controls. Acoording to loop suppression (IN2/EXC), their controls seem to work well and the peaking around 3-4Hz becomes smaller. Fig.4 shows the error/feedback spectra. The peaking seems to be disappeared although each residual GAS motion seems to be not changed so much.

## IM DAMP roll off modification

I also modified the roll off filters for IM DAMP {L, P, R, Y}. As for T and V, elliptic filter was also not used in SR3. So I did not touch them in this time. (Maybe it is better to change)

I measured the OLTFs after the modification. Figure.5, 6, 7, and 8 show the OLTFs of IM DAMP {L,P,R,Y}. Also Fig. 9 and 10 show the error/feedback spectra. the feedback above 10 Hz was rolled off successfully.

Images attached to this report
CAL (General)
takahiro.yamamoto - 22:33 Tuesday 17 March 2026 (36608) Print this report
Comment to Inspection of a network trouble between CAL and DMG for Low-Latency data transfer (36588)
Finally, this issue was solved by restoring a vanished VLAN settings on the DMG network switch (klog#36602).
The data transfer for the output of low-latency calibration pipeline was also resumed.
Now, it is nothing more than just a PD dark noise with applying DARM sensing response but the latest LL frame are also available at Kashiwa.
DGS (General)
takahiro.yamamoto - 22:20 Tuesday 17 March 2026 (36607) Print this report
Comment to Reorganizing the Camera Network (36590)
All other camera network switches were also reconfigured.
Now, all switches can be reachable from k1cam*.

-----
I couldn't find the camera switch at EY at first. This was because a same IP address was used on the switches at EY and OMC and OMC switch responded earlier than EY one when I accessed that IP address. That IP address was different segment from the camera network and switches couldn't be accessed from k1cam*, so I changed their IP addresses as one in the camera network segment. Latest information can be found in the JGW wiki.

And also, I added camera names on the port description of the switch management interface. This information helps us to do the emergency recovery of each cameras by disabling/enabling PoE power supply on the switch management interface. When a new camera will be added, please update the port description of each switches for an easy network management.
CRY (Cryostat IX)
nobuhiro.kimura - 21:48 Tuesday 17 March 2026 (36606) Print this report
Comment to Replacement of the Q-mass for the IXC (36578)

[Kimura and Yasui]

 At around 10:00 a.m. on March 17, we stopped the vacuum pumping in the Q-mass piping, opened the cryostat-side GV, and connected the Q-mass.
The pressure inside the piping before opening the cryostat-side GV was 1.8×10⁻⁴ Pa, and after opening the GV, it was 4.4×10⁻⁵ Pa.
 We then installed an analysis unit on the Q-mass piping. The final pressure inside the piping was 3.5 × 10⁻⁵ Pa.
We then removed the vacuum pumping unit from the piping.

Images attached to this comment
CRY (General)
nobuhiro.kimura - 20:43 Tuesday 17 March 2026 (36605) Print this report
Maintenance Work on the Duct-Shield Cryo-coolers for IXC and IYC was Completed

[Kimura and Yasui]

 On March 17, we completed maintenance work on the duct-shield cryo-coolers for IXC and IYC.
Maintenance work on the duct-shield cryo-coolers for EXC and EYC is also scheduled to be completed by the end of this week.
We are planning to restart the duct-shield cryo-coolers starting March 23, which will also serve as a test run.

Comments to this report:
nobuhiro.kimura - 8:45 Wednesday 18 March 2026 (36611) Print this report

[Kimura and Yasui]

Parts replaced during maintenance work
1. Absorber in the helium compressor
2. Filter unit at the supply side
3. Gas replacement inside the cold head in accordance with SHI work procedures
4. Disassembly and maintenance of the valve unit at the SHI factory
5. Gas replacement in the compressor and flexible tubing
(1) Helium gas used: G-1 grade
(2) Filling pressure: 14.8 bar

nobuhiro.kimura - 20:03 Wednesday 18 March 2026 (36617) Print this report

[Kimura and M. Takahashi]

 On March 18, we completed maintenance work on the duct-shield cryo-coolers for the  EYC.
We are planning to restart the duct-shield cryo-coolers starting March 23, which will also serve as a test run.

CAL (YPcal)
dan.chen - 15:43 Tuesday 17 March 2026 (36604) Print this report
YPcal calibration

Workers: Kohei Mitsuhashi, Dan Chen

We performed monthly Pcal-Y calibration on 2026/03/17.

After the calibration, we updated EPICS parameters related to the Pcal-Y system. No issues were found.

EPICS Key Before After Δ (After − Before)
K1:CAL-PCAL_EY_1_OE_R_SET 0.98973 0.98977 0.00004
K1:CAL-PCAL_EY_1_OE_T_SET 0.98973 0.98977 0.00004
K1:CAL-PCAL_EY_1_PD_BG_RX_V_SET -0.00484 -0.00492 -0.00008
K1:CAL-PCAL_EY_1_PD_BG_TX_V_SET 0.02704 0.01218 -0.01486
K1:CAL-PCAL_EY_1_RX_V_R_SET 0.50319 0.50276 -0.00044
K1:CAL-PCAL_EY_2_INJ_V_GAIN 0.51512 0.51836 0.00324
K1:CAL-PCAL_EY_2_OE_R_SET 0.98618 0.98609 -0.00009
K1:CAL-PCAL_EY_2_OE_T_SET 0.98618 0.98609 -0.00009
K1:CAL-PCAL_EY_2_PD_BG_TX_V_SET 0.02955 0.01466 -0.01489
K1:CAL-PCAL_EY_2_RX_V_R_SET 0.49681 0.49724 0.00044
K1:CAL-PCAL_EY_WSK_PER_RX_SET 1.84214 1.84228 0.00015
K1:CAL-PCAL_EY_WSK_PER_TX1_SET 0.33376 0.33354 -0.00023
K1:CAL-PCAL_EY_WSK_PER_TX2_SET 0.90500 0.90266 -0.00234

 

Images attached to this report
CAL (YPcal)
dan.chen - 15:38 Tuesday 17 March 2026 (36603) Print this report
Pcal-Y beam position check

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: Kohei Mitsuhashi, Dan Chen

Update Time: 2026/03/17 15:31:24

EPICS Key Before [mm] After [mm] Δ (After - Before) [mm]
K1:CAL-PCAL_EY_TCAM_PATH1_X 1.33223 mm 0.76950 mm -0.56273 mm
K1:CAL-PCAL_EY_TCAM_PATH1_Y 65.85923 mm 65.80570 mm -0.05353 mm
K1:CAL-PCAL_EY_TCAM_PATH2_X -0.29757 mm 1.39102 mm +1.68859 mm
K1:CAL-PCAL_EY_TCAM_PATH2_Y -69.75503 mm -69.21742 mm +0.53761 mm

 

DMG (Data system trouble)
nobuyuki.kanda - 14:48 Tuesday 17 March 2026 (36602) Print this report
DMG switch (in KAGRA tunnel) setting
There were network outages after the AC power stop/resume at 3rd March. cal-gst1,2 could not reach DMG VPN network 192.168.30.x.
The reason was VLAN setting of DMG's network switch in KAGRA (SR-S352TR1) was lost.
So we set as that connection port #1 and #2 of cal-gst1,2 to same VLAN of DMG network "vlan untag 30" as below list, respectively.
Now the network connection is resumed.

Below is a part of setting table of SR-S352TR1 now.
ether 1 vlan untag 30
ether 1 description cal-gst1
ether 2 vlan untag 30
ether 2 description cal-gst2
...
ether 38 description hyades-0_irmc
ether 39 vlan untag 31
ether 39 description hyades-1_irmc
ether 40 vlan untag 31
ether 40 description kamups01
ether 49 vlan tag 30-31
ether 49 description kaml2sw02
ether 50 vlan untag 30
ether 50 description hyades-0
ether 51 vlan untag 30
ether 51 description hyades-1
ether 52 vlan untag 30
ether 52 description hyades-2

We also change the password of SR-S352TR1.
VIS (IX)
ryutaro.takahashi - 13:51 Tuesday 17 March 2026 (36601) Print this report
Comment to Offload of GAS filters (33170)

I offloaded the F2 and BF GAS filters with the FRs.

PEM (Center)
takaaki.yokozawa - 13:36 Tuesday 17 March 2026 (36600) Print this report
Comment to Tapping test at PSL room (36594)
I just made the all plots for the tapping tests JGWDoc17238
AOS (Beam Reducing Telescopes)
ryutaro.takahashi - 13:34 Tuesday 17 March 2026 (36599) Print this report
Comment to Signal generator for the TMSX LVDT is dead (36501)

[Washimi, Takahashi]

We replaced the broken signal generator (SG) NF1956 with the embedded SG card for the LVDT driver (S1807787) in TMSX. We opened the driver chassis and inserted the SG card. The output of the SG card was connected to "REF IN" port on the front panel. The signal was set to 10kHz in frequency and 7Vp-p in amplitude.

Images attached to this comment
PEM (Center)
takaaki.yokozawa - 12:19 Tuesday 17 March 2026 (36598) Print this report
Comment to Tapping test at PSL room (36594)
Very preliminary results.
Only for the mirrors before the PMC

Fig.1. overview (temporary, I tagged M01' - M04' for the mirrors of the new laser)
Fig.2. - Fig.5. showed the various DQ channels. including the PMC related channel, IMMT1 trans QPD2, IMC refl QPD1,2 (DC, 14I, 14Q), IP QPD1,2 and accelerometers

As you can see, Quite large excess can be seen in IMMT1 trans QPD, when we tapped the M3' and M4' mirrors, that the interesting issue.
Images attached to this comment
CAL (YPcal)
Misato Onishi - 12:18 Tuesday 17 March 2026 (36597) Print this report
Preparation for laser replacement
Dan Chen, Kohei Mitsuhashi, Misato Onishi

We checked the following items for the replacement of the YPcal laser:
・The location for installing the new laser source --> A new rack is required
・The location for installing the periscope
DetChar (General)
hirotaka.yuzurihara - 11:07 Tuesday 17 March 2026 (36596) Print this report
Preparation for the upgrade of Pastavi server

The new Pastavi server was purchased with the SEO budget and delivered to the KAGRA site. I performed the initial setup on the server and copied the data viewer system. After completing the preparation at the KAGRA site, I sent it to Kashiwa last Friday. I will replace the server in Kamioka this Thursday. 
Please note that it may take some time to recover the noise budget mode. I expect it to be restored within a few days.

Note

  • Because the OS version jumped significantly from 9 to 12, many modifications to the settings were necessary.
  • The cgi package has been deprecated from Python 3.13. Although it is possible to use legacy-cgi, its behavior was slightly different from what I expected. Therefore, I decided to use Python 3.12. In the future, it may be necessary to redevelop Pastavi using another framework or tool.
  • Installation of the frameL was not as straightforward as in the previous environment  (actually I just wanted to use the FrChannels command). The procedure for installing lal (or framel) using apt is described on the following pages: [wiki] [IGWN debian repo]
DGS (General)
satoru.ikeda - 10:04 Tuesday 17 March 2026 (36595) Print this report
Comment to Deployment of V2 IO-chassis and the front-end computer for ITMX (36572)

ITMX has successfully reached the LOCK_ACQUISITION state.
We will leave it in this state for a while to verify that no issues arise with the new V2 I/O chassis.

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