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• VISMinutes20170519

Agenda/Minutes of the VIS Meeting on 2017/5/19

2017/5/19 13:30 - 15:00

Participants: Mark, Enzo, Okutomi, Aso, Takahashi, Hirata, Fabian, Ishizaki, Tanaka, Sato, Raffaele

Progress report

Schedule Chart : (PDF,MPP)

• Type-A: 1 week delay
• Type-B: 6 weeks delay
• Type-Bp: 1 week delay

Type-A (Takahashi)

Past week report

Installation in Y-end:

16th(Tue)

• Took out the DP from the cross tube.
• Unhooked the maraging wire for the DP.
• Tried to hook the maraging wire for the cryo-payload, but could not hook it.

17th(Wed)

• Asked MESCO modification of the receptacle for BF. The slit width of receptacle was extended.

18th(Thu)

• Mounted the receptacle and hook the maraging wire.
• Went to the connection test with the cryo-payload.
• The bottom position of maraging wire was too low (about 10cm).
• The height of BF in the 3D model for cryo-payload was different from the latest Type-A model.

19th(Fri)

• Unhooked the maraging wire.
• Mounted the DP.

Plan for coming weeks

• Check the DP weight.
• Lift up the EQ stop, and disassemble the top plate.
• Lift up the F2 stage to the frame lock.
• Extract the maraging wire for cryo-payload.
• Go to the setting of PI.

How to deal with the height mismatch ?

• We have three of 3.3m rods not heat treated.
• Cut those wires to make, for example, 1.5m and 1.7m rods.
• Make threads on the ends and join them together with a long nut ?
• This way, we can install the rods after the Type-A chain is installed. Also the heat treatment is much cheaper (because the rods are short).
• Virgo is using similar joint-wires. Takahashi will ask Virgo the joint mechanism of their wires.

Type B (Mark)

Past week report

At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):

• We cleared space for the PR2 team to remove a bellows from their tank.
• We installed safety bars on the pillars near the assembly frame at about waist height for someone on the tall ladder. We reinforced the clamps with cable ties.
• We bridged a gap in the second floor on the -X side of the SF2 tank with spare floor panels.
• We removed the PI from the assembly frame.
• We encountered a problem with the PI-SF rod jamming in the SF. We finally got it out by clamping a pair of vice grips to the rod and hammering. We found that the receptacle part was the right size (7.0 mm) but had been deformed around the edge. Hirata-san used a knife and sandpaper to lean up the edge and then ultrasonically cleaned it.
• We removed the LLB blade units from the PI, removed the blades from the clamps and sent the blades away for more rework to fix the length problem. Fortunately the tab section at the tip is fairly long, so we can just add a second hole further from the end.
• We tested the SR fishing rod again, but it would only go up, not down. We found that reseting the driver fixed it, but we also moved the driver boxes into the cleanbooth to reduce the length of the motor cables. (To support the drivers, we had to run some long DC and LAN cables.)
• We adjusted the limit nut on the SF fishing rod to increase the range.
• We debugged an issue with the SF keystone sitting lower than previously and found we had accidentally left two eyebolts on top of the BF. We retrimmed the BF/... section to reset the keystone to nominal (65.5 mm) with the fishing rod at mid-range.
• We removed one segment of the Cu ring on the SF cap and reconfigured the other two to be symmetrical.
• Fabian designed a layout for the SF damper ring magnets that would work with the modified Cu ring, and placed the magnets with the template. The poles of the magnets were not on the expected faces so we had to stand the magnets up, with the 12x12 faces sideways and the 10x12 mm pole faces up/down. We will need to raise the magnet ring by 2 mm to allow for the extra height.
• Hirata-san made an adapter cable for the PI vertical LVDT to let it connect to a standard Type 1 cable.
• Enzo made a PI yaw/vertical stepper adapter cable and a trial geophone descrambler cable (one of three).
• We placed the geophones on the PI but discovered we didn't have some mounting brackets called out in the 3D CAD.
• Fabian added the remaining cable clamps to the PI.
• We found that part of the problem with the SF LVDT was that the actuation had not been enabled for SF or F0 in the real-time model. We fixed the model and are now able to drive the LVDT actuator and see input at the LVDT sensor. However there is apparently a lot of coupling directly from output to input (presumably from transformer action between the sensing and actuation coils), so we're investigating.

Plan for coming weeks

Target date for the installation into the chamber is June 5th

For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo. We will use this To Do list to keep track of the progress.

Weeks of 5/22, 5/29:

• Retest SF stepper every day, to see if problems recur.
• Find/install geophone adapter plates or improvise replacement.
• Reinstall PI, this time with rods and damper ring.
• Reinstall PI-SF rod, this time with hex cable clamp.
• Cable/test PI geophones LVDTs and steppers.
• Reinstall LBB blade units.

Type-Bp (Shoda)

Past week report

• SF was set on the Traverser, and the chain below BF was suspended from SF (in the week of 5/8)
• BF weight and tilt was adjusted
  • We tuned the weight according to the height of the keystone.
  • Balanced the BF roughly according to the tilt of IRM. After that, we tuned more using the picomotors according to the IM OSEM signals.
• We found the BF FR was not moving well.
  • We opened the BF cap a little bit by hanging from the SF, and checked that the BF FR still has the actuation range.
  • The problem was wiring. We found that the resistance between 2-7 pin was much high (usually ~9 Ω just before the driver, but resistance between 2-7 was ~60 kΩ).
    • We fixed the cabling, and it started working again!!
  • The cap was closed after checking, and cabling was fixed.
• Two of the old OSEM flags on PR2 cannot be removed so far. The gluing schedule was changed.

Plan for coming weeks

• Tilt alignment of BF & IM

• Installation into the tank.

IMMT (Ohishi)

Past week report

• Checked the designed IMMT mirror position in IOO coordinate.

Plan for coming weeks

• Revise magnet fixture jig drawings
• Have a meeting with FCL at Mitaka on 26th morning.

Watchdog system (Tanaka)

Past week report

• Start mounting on the 19 inch rack(Main 4ch WDS box).--> Complete(the wiring is still).

• Start formulating an experimental plan(First test) at the KAGRA site.-->

  • Draft planPDF(JGW-E1706737)

Plan for coming weeks

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

Safety

• Incidents: Nothing.
• Foreseen risks
  • Type-A: Crane work
  • Type-B: Crane work
  • Type-Bp: Installation into the chamber

Discussion

• JPS presentation
  • Takahashi will give the Type-A presentation instead of Okutomi
  • Takahashi will not go to ASJ.

Travel Plans

• Travel (Week of 5/22):
  • Takahashi: 24 - 25
  • Shoda: 22 - 25
  • Mark: 22 - 25
  • Fabian: 22 - 25
  • Okutomi: 22 - 25
  • Fujii:
  • Ishizaki: 22 - 25
  • Hirata: 22 - 25
  • Sato: 22 - 25
  • Enzo: 22 - 25
  • Ohishi: 25 night -26 (Mitaka)
  • Tanaka:
  • Sekiguchi(Hosei): 23 - 25
  • Hirayama(Hosei): 23 - 25
• Travel (Week of 5/29):
  • Takahashi: 29 - 6/2
  • Shoda: 29 - 6/2
  • Mark: 29 - 6/2
  • Fabian: 29 - 6/2
  • Okutomi: 29 - 6/2
  • Fujii:
  • Ishizaki: 29 - 6/2
  • Hirata: 29 - 6/2
  • Sato: 29 - 6/2
  • Enzo: 29 - 6/2
  • Ohishi:
  • Tanaka:
  • Sekiguchi(Hosei): 30 - 6/2
  • Hirayama(Hosei): 30 - 6/2

Next meeting

On 2017/5/26(Fri) F2F in Mitaka