• KAGRA
• Subgroups
• VIS
• VISMinutes20170915

Agenda/Minutes of the VIS Meeting on 2017/9/15

2017/9/15 13:30 - 15:00

Participants: Takahashi, Mark, Ohishi, Okutomi, Aso, Arai, Shoda, Miyo, Sato, Simon, Enzo, Fabian, Tanaka

Progress report

Schedule Chart

Type-A & Bp : (PDF,MPP)

Type-B: (PDF,MPP)

• Type-A: 1-2 weeks delay
• Type-B: BS installation into the chamber: 9/20
• Type-Bp: PRM installation into the chamber: 9/19

Type-A (Takahashi)

Past week report

[X-end]

11th(Mon)

• Lifted down the F2 into the corrugate tube.
• Extended the EQ stop to the top ring.
• Made the flat cables.
• Applied the cabling from F1.

12th(Tue)

• Checked the LVDT signals from the filter chain.
• Lifted down the F1 into the corrugate tube.
• Set the anchor to the bottom of EQ stop.
• Adjusted the load for F3.

13th(Wed)

• Lifted up the F1 to the frame lock.
• Adjust the tilt of F2.

14th(Thu)

• Attached the cone bellows to the top chamber.
• Adjust the tilt of F2.

[Y-end]

15th(Fri)

• Joined to the cryo-payload test.

Plan for coming weeks

• Finish the installation of F1.
• Start the installation of pre-isolator.

Type B (Mark)

Past week report

At Kamioka (Mark, Ohishi-san, Fabian, Enzo, Hirata-san, Yoshioka-kun, Kozu-kun):

• We disconnected the SF/... section and reinstalled the F0-SF rod with the hex cable clamp attached.
• We debugged an issue with the actuation (the real-time model needed rebooting).
• We routed all the SF/... cables up to the bottom of the PI, and then to the feedthroughs.
• We unlocked the F0 keystone and experimented to find the amount of mass needed on the SF (≈845 g).
• We attached the SF trim mass, adjusting it laterally so that the SF was level in pitch and roll.
• We corrected some errors on the MEDM screens (some broken links and Take/Restore Safe.snap buttons).
• We cabled all the PI items through to the rack and did very basic testing.
• We disconnected the security structure from the assembly frame and adjusted the PI till the SS was vertical.
• We unlocked the IP and adjusted the PI jacks and FRs till the IP was centered.
• We passed the halves of the LBB Cu damping ring (less the Cu) into the chamber and joined them.
• We put the magnets on the LBB damper ring using the template.
• We locked various combinations of keystones and measured the vertical resonance frequencies of the unlocked filters.
• We spent time on getting the geophones working. The original descrambler adapters had gone missing, so Enzo created three new ones. We borrowed a cable to replace one that had broken. The geophone distributor (S1402167) failed (no power on the negative rail), and a replacement borrowed from SR3 (S1605513) kept switching off.

Plan for week of 9/19

No work Mon 9/18 (敬老の日)
Mark, Fabian, Enzo, Ohishi-san, Hirata-san, Yoshioka-kun (Tue, Wed, Thu, Fri), Kozu-kun

• Double check BS pitch with OL.
• Adjust SF damper ring to correct gap.
• Install lock nuts on F0 GAS FR at TBD positions.

• Lock BF and F0 keystones (but not SF keystone).

• Lock RM to BS and IRM to IM.
• Lock RM, IRM and BF (but not SF) to security structure.
• Lock IP.
• Remove F0 keystone top plate (including yaw stepper) and immobilize SF/... in yaw.
• Attach lifting fixture.
• Remove BF- and SF-level crossbars.
• Remove geophones for craning.
• Disconnect in-vacuum cables from feedthrough and coil neatly for craning.
• Attach lifting plates.
• Attach Cu segments to LBB damper ring (needs Cu segments and BUMAX countersunk screws, expected 9/20).
• Pass halves of LBB magnet ring into tank, join, and make sandwich for craning.
• Crane tank lid off.
• Crane LBB damper rings to top of tank and suspend.
• Crane suspension out of assembly frame.
• Attach LBB upper rods to LBB blade tips and rotate suspension 45° clockwise.
• Crane suspension into tank and connect upper rods to LBB Cu ring.
• Unclamp LBB ring "sandwich" so LBB Cu ring is suspended on upper rods.
• Install LBB lower rods and hook LBB.
• Measure required ballast for LBB.
• Unlock suspension and readjust.
• Move in-air cabling and feedthroughs and reconnect in-vacuum cables (through Cu O-rings).

Plan for week of 9/25

TBD

• Debug cabling.
• Run TFs.
• Install LSOL?

Vacation Info

Mark: 10/16-24

Type-Bp (Shoda)

Past week report

• PRM
  • We cleaned the suspension and fixed it. Now almost ready for the installation.
• PR2
  • We found we could not measure the PR2 transfer functions.
  • We found the suspension is touching the EQ stop. It is because the Traverser did not have two spacers below the top plate and SF stage and EQ stop are tilted. We lifted the suspension from the SF stage a little and inserted the spacer sims so that the height is as designed. Now the suspension does not seem to be touching anywhere.
  • The LVDT signals are different from what we observed in July.
    • The creepy high freq noise was gone, and the DC offset was different. We do not know in which point the status has been changed, since the excitation signals are plugged out since the middle of Aug. We adjusted the GAS LVDT offset again.
  • The +/- 18V power supply was not proper and the OSEM noise level was too high. Also coil drivers did not seem to be working properly. It appears since 4th Aug. Now it is fixed.
  • All the GAS TFs have not been measured yet.
  • We removed/changed some screws that require vent holes.

Plan for coming weeks

• PRM installation

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

Watchdog system (Tanaka)

Past week report

• Waiting for concrete information on installation location.The type(High power,Low power)and number actually needed,and the peripheral equipment accompanying it.-->Waiting for information provision.

• Creating the final version for mass production and running its operation test.-->Implementation completion and operation test.

• I held a meeting to make estimates with several vendors.-->Price negotiation in progress(Ongoing).

Plan for coming weeks

• Creating the final version for mass production and running its operation test.-->Implementation completion and operation test.

• Creation of extended I/O PCB(plot type (With the Main 4ch WDS box and I/O box,I/O board For relay).-->Ongoing.

Other site works

• End of Aug. to Nov.: Mozumi entrance will be closed

Safety

• Incidents: no incident
• Foreseen risks
  • Type-A: Crane work and work at height
  • Type-B: Crane work and work at height
  • Type-Bp: Crane work

Discussion

• Plan for the activities in Oct. and Nov.
  • SR3 and ITMX Type-A installation will start from Dec.
  • We need to use the time efficiently for the preparation.
  • Aso will make a plan and check it with each VIS member.
• Party for the completion of the BS installation
  • Will be held on Sept. 22nd at lunch

Travel Plans

• Travel (Week of 9/18):
  • Takahashi: 19-22
  • Okutomi: 19-22
  • Sato: 19-22
  • Ishizaki: 19-21
  • Mark: 19-22
  • Fabian: 19-22
  • Hirata: 19-22
  • Enzo: 19-22
  • Shoda: 19-21
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Yoshioka (Toyama): 19,20
  • Kozu (ICRR): 19-22
  • Arai (ICRR):
• Travel (Week of 9/25):
  • Takahashi: 25-29
  • Okutomi: 25-29
  • Sato: 25-29
  • Ishizaki: 25-29
  • Mark: 25-29
  • Fabian: 25-29
  • Hirata: 25-29
  • Enzo: 25-26
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanaka:
  • Yoshioka (Toyama): 26,27,29
  • Kozu (ICRR): ??
  • Arai (ICRR):

Next meeting

On 2017/9/22(Fri)