Contents
Activities in this week
- klog15860
- klog15844
- klog15617
15872, Monday, VIS/OMM, ryutaro.takahashi
- klog15847
15873, Monday, VIS/General, kouseki.miyo
- klog15857
- klog15737
15877, Monday, VIS/General, satoru.ikeda
15878, Monday, CRY/Cryo-payload EX, takafumi.ushiba, EX payload upgrade
15908, Wednesday, CRY/Cryo-payload EX, takafumi.ushiba
15889, Tuesday, VIS/PR3, fabian.arellano, Traverser motor test and cabling.
15891, Tuesday, VIS/EY, ryutaro.takahashi, Setup of F3
15868, Sunday, VIS/General, kouseki.miyo, Some suspensions are not SAFE.
15923, Thursday, VIS/General, kouseki.miyo
15905, Wednesday, PEM/General, tatsuki.washimi, Bird watching (Ondotori maintenance) 2021
15919, Wednesday, VIS/EY, ryutaro.takahashi, Setup of BF
15921, Wednesday, VIS/SR3, fabian.arellano, Oplev installation.
- 15928, Thursday, VIS/SR3, fabian.arellano, Oplev installation and alignment recovery.
15871, Sunday, VIS/General, kouseki.miyo, ISOLATED state is available with only LVDTs not blended sensors.
15881, Tuesday, PEM/Center, takaaki.yokozawa, IXC
15883, Tuesday, CRY/Cryostat IY, takayuki.tomaru, IYC test (temperature & frosting)
15884, Tuesday, CRY/Cryostat IY, rishabh.bajpai, Vibration Analysis
15886, Tuesday, VIS/PR3, satoru.ikeda, Driveable range of the PR3 GAS SF stepper motor
15888, Tuesday, VIS/General, kouseki.miyo, All payload models are in PAYLOAD_MASTER.mdl
15910, Wednesday, VIS/EY, kouseki.miyo, TF measurement for F3 GAS filter
15913, Wednesday, CRY/Cryostat IY, takayuki.tomaru, IYC cooler no.3
15916, Wednesday, IOO/IMC, tomotada.akutsu, Pre-inspection of the suspension structures for MCi
15917, Wednesday, IOO/IMC, tomotada.akutsu, Turned off the power supply to the tilt-sensor laser
- 15930, Thursday, VIS/PR2, satoru.ikeda, Connect and check the drive of the PR2 traverser.
- 15933, Thursday, PEM/EY, tatsuki.washimi, portable fluid meter
Agenda/Minutes on 2021/2/5
CRY+VIS Interface Meeting
13:30-14:00
Participants: Takahashi, Miyo, Aso, Sato, Tomaru, Ushiba, Ikeda, Hirata, Kimura, Akutsu
- Schedule for IX: Connection is scheduled in the week of 2/8. Do you work on 2/11?
- Schedule for IY: Disconnection is scheduled on 3/11.
- Schedule for EX: Connection is scheduled in the week of 3/15.
- Corrugate tube fixing jig: Re-measurement is planed in 2/26-3/1 at IYV.
- Commissioning in air:
- Commissioning in vacuum: Two phased commissioning will be tried in IX at beginning. After that, one phase is default.
- Acceptance check: Cryo-payload in IX and Type-A tower in EY are on going. PD dark noise will be evaluated.
- Jig for FC painting: Delivery is delay.
- PF actuator: Dead line depends on the schedule of commissioning.
VIS Meeting
14:00-14:40
Participants: Takahashi, Fabian, Hirata, Ishizakui, Miyo, Sato, Sugiyama, Aso, Tanaka, Washimi
Progress report
General
Type-A
- Finished assembly of the ACCs and the geophone pods in IX.
- Setup the F3: Calibration of the LVDT, Measurement of the FR range, Tuning of filter, Measurement of the TFs, Cabling around the F3.
- Lifted down the EQ stop into the corrugate tube. The F3 stage sit down the frame lock.
- Started the F2 stage.
Type-B
Albums
SR3 alignment recovery (klog15928)
- We installed the oplev hardware, installed a new (orange) power cable for it and re-routed QPD cables underneath the floor panels.
- We used the IP horizontal fishing rods to place the IP in the vicinity of the setpoint.
- IM-Y had an unusually large value, namely, -2.9 mrad. I don't know how this happened and I should check. I used the picomotor to set it back to around zero.
- Although we tried to keep the same value of yaw of the chain when we installed the F0 yaw motor, we might have change a little bit.
- I tried to align the oplev without moving the components on the board, provided they had been aligned. However, the position of the collimator seems off by a large amount and a lot of adjustment in tip and tilt was necessary.
- At the end of Thursday the beams were coming close to the QPDs but I think I need to move the position of the collimator. I'll do this on Monday.
- The temperature was 23.1 degrees.
Plan for next week
- Monday: Finish the alignment of the oplev and move the BF fishing rod to midrange.
- Tuesday onwards: begin the adjustment of the IM ballast mass.
Type-Bp
Albums
PR3
Gluing of the mirror wire
- Last week Friday we had mixed two portions of EP30 in order to test the adhesive. They both cured well so, on Monday we prepared another portion in a plastic tray and applied it to the wire. I have the impression that the problem with the portion that didn't cure was that we used an improvised tray with folded Al foil and the low viscosity component went in between folded Al sheets.
In Tuesday the new portion had cured so we proceeded to install the front ring and then released the payload. (We left the uncured adhesive on the wire.)
According to the oplev, we disturbed the pitch by +3.8 mrad approximately (klog15941). The value of pitch with respect to the horizontal still has to be measured, the mirror must be realigned to 1/300 rad with picomotors and the OSEMs must be adjusted.
Traverser in PR3 and PR2
Together with Ikeda-san we tested the Traverser driver. We set up dial gauges onto the motors to measure their motion. However, the traverser simply didn't work (klog15889 and comments).
- Later on we learned that the connector pin assignment was different from PR2 and PRM, and that there was even an adapter connector for PR3.
Ikeda-san and Hirata-san tested the Traverser in PR2 using the dial gauges and it worked well (klog15930).
Today they changed the pin assigment in the in-vacuum connectors in PR3 and tested the whole system using the dial gauges. It worked well (klog15944).
Type-C
- SEO has started the process of installing a shield on IMC's Type-C.
- Remedy of cabling for the actuator coils in the IMC suspensions is required.
- Please refer to the following K-log for details.
Controls
Commissioning status is written in Suspension Commissioning Document
Electronics
- The last simulation on the TF for LVDT cards was wrong. The TFs did not depends on the additional impedance (BPF, LPF).
- Made the ver 2.5 combiner circuit. It will be sent to Kamioka.
Towards O4
- Type-B/Bp remedy work is on going.
- Installation of Type-A is on going in EY.
- Schedule.
- Procedure documents.
- Criteria in the acceptance test.
Safety
Discussion
Travel Plans
The week from 2/8
- Takahashi: 2/8-12
- Sato: 2/8-12
- Hirata: 2/8-12
- Yano: 2/8-12
The week from 2/15
- Takahashi: 2/15-19
- Sato: 2/15-19
- Hirata: 2/15-19
- Yano: 2/15-19
Next meeting
- On 2020/2/12(Fri)