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| * Mark did a top level schedule. The BS can probably be finished roughly when promised to Ando-san earlier, but the SRs will probably take rather longer because of all the prep work that still needs to be done. It may save time overall to delay the start of the BS installation a few weeks and concentrate on parts for SR. A second assembly frame would probably. | * Mark did a top level schedule. The BS can probably be finished roughly when promised to Ando-san earlier, but the SRs will probably take rather longer because of all the prep work that still needs to be done. It may save time overall to delay the start of the BS installation a few weeks and concentrate on parts for SR. A second assembly frame would probably help. |
Minutes of the VIS Meeting on 2016/6/17
2016/6/17 13:30 - 15:00 @ Room 210
Participants:
Progress report
Type-A (Takahashi)
Type-B (Mark)
- Type B Past Week Summary
There were multiple issues with the dummy BS flag/prism gluing klog. The sapphire prisms will need to be removed and reapplied. Hirose-san is going to organize this. He is trying the cup that had been made for the PR2 on the dummy BS. Despite not having the ideal radius of curvature, it works to confine the acetone, and we will see shortly how much soaking is required to get a prism off.
- Akutsu-san provided stainless steel mirror panels for the dummy BS made by ATC.
- Hirata-san added the optical layout information to the BS Inventor assembly. He requested tank information from Mirapro so he can continue to do SR2/3/M.
- Hirata-san worked on the crane height problem with Saito-sensei. They concluded that craning in the suspension is possible but will require not just the vacuum tank lid but the ≈30 cm section of tank below it to be removed.
- Hirata-san liaised with Nakamura-san of Mirapro. Mirapro could start assembling the frame in the first week of July.
- Hirata-san cleaned more parts and measured another filter.
- Fabian finished the IM assembly and started on the IRM and RM. Some of the IRM panels had been improperly wrapped and will be re-cleaned. The MPC (multi-purpose cube) on the RM needed some rework (already done).
- Mark did a top level schedule. The BS can probably be finished roughly when promised to Ando-san earlier, but the SRs will probably take rather longer because of all the prep work that still needs to be done. It may save time overall to delay the start of the BS installation a few weeks and concentrate on parts for SR. A second assembly frame would probably help.
Mark released a draft (about half-finished) of JGW-E1504235 - BS Installation Procedure.
Mark updated JGW-D1503600 - BS Suspension Cabling with a better arrangement for the IM and BF pico motor cables, as well as various other minor fixes.
- Mark organized a review for Thursday 6/16.
- Type B ongoing issues
- Wires
- Need to decide RM wire thickness and order BS and RM wires. Lead time is a few days from Nilaco.
- OSEMs
- Akutsu-san is working to get wide-mouth OSEMs
Longer cables for BF->PI and SF->PI.
- Takahashi-san has ordered extra connectors (due any day) and will get a company to make the cables.
- Feedthrough Adapters
- Need large quantity of male and female D-Sub 9, IDC ribbon connectors - Takahashi-san is getting a quote.
- Can we make SR wire breakers bigger?
- Fukushima-san will start on machining test soon (as of 5/27).
- Not enough crane height problem (Hirata, Saito) - SOLVED
- Installation stuff
- Crane scale - quote received
- Ballast masses for payload
- Initial batch received - ordered extra smaller ones to allow for adjustments.
- Lower breadboard stuff
- Installation to be incorporated into the procedure document. Mark/Takahashi to discuss.
- Breadboard springs (in manufacture, expected end of July)
- Nail-head parts: quote from Mirapro received, not urgent, will be combined with assembly frame order.
- Documents
BS Assembly Procedure E1504235, E1504235 draft
- Wires
Type-Bp (Shoda)
Create a rough new LVDT model -> Saito-san found that they fit around the BF.
Assembly plan for Modified Type-Bp: JGWdoc -> asked Saito-san to do more upgrade.
- Upgrade points: some screw sizes were wrong. Move the security poles inside so that we can fix them from the top.etc...
- I found that we cannot load on the BF than I expected before.
- The model of the BF was updated recently. When we decided the plan BF, the model was wrong, which means that the mass was wrong.
- The load on the SF GAS = Tha mass on the BF GAS: 53.5 kg + IRM: 9.0 kg + BF: 100.2 kg = 162.7 kg
- The optimal load on the SF GAS is 164.3 kg (minimum for the SFs whose caps cannot be closed).
- The weight of the actuator base is currently 1.9 kg (w/o coils and magnets).
- I suggest to gain weight margin by reducing the moving masses on the cap.
IMMT (Ohishi)
- Put a report here
Watchdog system (Tanaka)
- Put a report here
Safety
- Any issue this week ?
Issues
- BS flag/prism glueing problem (Mark)
- LVDT for BF damping (Shoda, Raffaele)
- Dummy payloads for Type-A (Takahashi)
- How difficult it is to make mirror mounted payloads
Site work plan for the next week
- Mon:
- Tue:
- Wed:
- Thu:
- Fri:
BS crane will not be available: 13th -14th of June
Travel Plans
- Travel (Week of 6/20):
Takahashi:19-21 (Acceptance of SFs, check items, move things around and so on)
- Shoda:
Mark:20-24 (preparation for BS installation)
Fabian:20-24 (preparation for BS installation)
- Okutomi:
- Fujii:
- Ishizaki:
Hirata:20-24(not yet decided)
- Ohishi:
- Travel (Week of 6/27)
- Takahashi:
- Shoda:
- Mark:
- Fabian:
- Okutomi:
- Fujii: 27-29
- Ishizaki:
- Hirata:
- Ohishi:
- Sato:
July 4 - 8: Takahashi, Ishizaki, Sato (site check for the installation of Type-A)
Mark is away: July 8-20
Next meeting
2016/6/24(Fri) 13:30 -
Next F2F 7/8