Agenda/Minutes on 2021/1/15

CRY+VIS Interface Meeting

13:30-13:55

Participants: Takahashi, Ikeda, Aso, Hirata, Sato, Miyo, Yano, Ushiba, Kimura

Schedule for IX: Connection of ITMX was rescheduled from 1/26.
Schedule for IY: Cooling of payload was postponed to 1/18.
Schedule for EX: Connection of ETMX was scheduled 3/15.
Corrugate tube fixing jig: Re-measurement at the beginning of March (3/1-3) in IYV is planed.
Commissioning in vacuum:
Acceptance check items:
Jig for FC painting: Under manufacturing.
PF actuator: by the end of January.

14:00-15:20

Participants: Takahashi, Ikeda, Aso, Hirata, Sato, Miyo, Fabian, Terrence, Tanaka

[Miyo] Management of the motor system in VIS.
- I asked Ikeda-san to be a manager for the motor system including pico, stepper, cryo stepper.
- Ikeda-san will report some document of acceptance check for the system.
- VIS mini rack layout (JGW-D2112441) with YamaT, Washimi

Albums

Week of the 11th of January

We finished the cabling of the F0 yaw stepper motor. Ikeda-san updated the software with the channel number selected.
W tested F0-V and F0-Y limit switches by pressing them with the finger and checking the response in the medm screen. They worked as expected.
We checked the polarity of the IP coil-magnet actuators. H1 had the reverse polarity and it was corrected in hardware.
Using information collected before the removal of the LVDTs and after their installation and calibration, I calculated the offset to write in the medm screen in order to have the desired setpoint at zero (klog pending).
- Hirata-san and Fabian updated the medm screen (klog pending).
- The SDF table was updated with the new values (klog pending).
- The next steps (to happen today or Monday) are
  - To write in the medm screen the simple geometrical transformation matrix from H_{i} to L, P and Y and
  - Turn the control system on and make sure it's stable.
  - Diagolalize the LVDTs and their actuators.

SR3

We moved the SR3 small rack inside of the clean booth to a new permanent position.See this the location in this picture and this other one.

The boxes with electronics were put following the same layout as in SR2 and BS, which was reported by Washimi-san in klog 15736.
The cables were routed underneath the 2nd floor panels in a tidy way.
The connections still have to be tested by turning the control system on. I aim to do this next week.
The SRM cables and rack still have to be arranged in the same way.
Mirapro can move the rack at any time of their convenience, with the exception of Monday, when we will remove some items which are next to the assembly frame in the 2nd floor and next to the SR3 chamber in the 1st floor.

Plan for next week

Monday:
- Removing items around SRM and SR3 chambers to allow Mirapro work whenever is suitable for them.
- Add ballast mass in BS BF.
Others:
- Recover SR3 alignment after cabling as preparation for ballast mass adjustment (1 person).
- Install SR3 oplev (2 people).
  - We should install it depite it would make access to the payload difficult.
  - This difficulty is mitigated by the fact that we have access from the side doors. We will assess this situation in situ and decide.
  - In case we decide not to install the usual oplev we will use an improvised oplev supported by the chest of drawers far away enough from the door to allow access.
- Lower the pre-isolators with the jacks (3 people).
- Adjust ballast mass on top filters.
- Set the F0 limit switches in suitable positions.
- Measure again resonance frequencies of IPs as preparation for adding mass onto them to adjust such the frequencies.

[Miyo] Suspension Commissioning document
- I started to write a document for SC. (sorry, now written in Japanese.)
- I will explain the detail for that in next VIS meeting.

Test board of ver.2 combiner circuit: The output of secondary coil is still attenuated.
Difference between the simulation and actual circuit is too large.
The buffer circuit was effective to avoid the attenuation.
Will check the effect of modified LVDT board.

The week from 1/18

The week from 1/25

KAGRA/Subgroups/VIS/VISMinutes20210115 (last edited 2021-01-15 16:28:41 by RyutaroTakahashi)