Agenda/Minutes of the VIS Meeting on 2016/7/1

2016/7/1 13:30 - 15:00 @ Room 210

Participants:Takahashi, Okutomi, Ishizaki, Tanaka, Sato, Shoda, Hirata, Fujii, Mark, Fabian, Ohishi, Aso, Akutsu, Raffaele

Progress report

Schedule Chart (PDF,MPP)

Type-A (Takahashi)

• Minutes of Type-A Meeting

  • Update the assembly schedule of the BFs
  • Update the EQ stop production schedule (deadline is the end of September)
    • Release sensor mounting parts will be ordered with the EQ stop

    • Vacuum compatibility & pumps: will discuss with Saito-san in the next week

  • Installation document: initial version by the end of July. Then have a review.
  • Discuss the schedule in Kamioka
• Simulation (Okutomi)
  • Structural damping is not compatible with the SS representation.
  • Try to zero the damping. Then try to use the viscous (velocity) damping.
  • Show the results with BF damping in the next meeting.

Type-B (Mark)

• Type B Past Week Summary
  • Mark and Fabian worked at Kamioka with Fujii-san:
    • We attempted to measure the tilt sensitivity of the accelerometers by adding shims under the legs but gave up when we discovered that picking up and putting down the accelerometer perturbs the zero point even without shims. We will probably need a special tilt stage to do this properly.
    • We took some frequency and Q measurements. The results were amplitude dependent. Joris thinks that this is due to not operating the accelerometers close enough to zero DC output.
    • We set up for a test of the geophone noise. One geophone is reading half the output of the others - one of the adapter cables is broken.
  • Hirata-san:
    • Received extra compensation masses and washed them.
    • Received PI guides, assembled them and shipped them to Kamioka.
    • Received backup set of pillar for security structure (with M10 instead of M12 holes at top).
    • Removed adhesive from base of BS flags in preparation for regluing.
    • Did assembly drawings for cable clamps and other add-on parts for BF and SF.
• 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.

    • Connectors RECEIVED, cables being made.
  • Feedthrough Adapters
    • Connectors RECEIVED.
  • SR machining test ONGOING.
  • Installation stuff
    • "Ceiling" work in BS clean booth (removal of second floor section) scheduled for Fri 7/1.
    • Assembly frame construction scheduled for 7/4
  • 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 - ordered with assembly frame, will arrive next week.
  • Documents

    • BS Assembly Procedure E1504235, E1504235 draft

• Discussion
  • Flags: ask hirose-san. optical flat test
  • SR preparation: see what can be done while Mark is on vacation.

Type-Bp (Shoda)

• Type-Bp 3D Drawings
  • Discussed with Virgo people about F7 LVDTs.

    • Obtained Virgo LVDT 2D drawings. -> Sent to Saito-san@ATC to implement them to Type-Bp modification.

    • Sent some information about the KAGRA LVDT circuit to Virgo so that they can see if we can use the same circuits.
  • Type-Bp design review is planned to be held in the week of 19th.
• Simulation
  • The matrices to simulate the coupling to other DOFs by shifting the actuator position is implemented.
    • The actuator position at BF does not seem to affect the performance so much. More detailed simulation required.
• Installation related issues
  • Making the plan for the overall installation plan, such as how to install the optical bench and how the the assembly frame should look like.
    • Report will be submitted by 7th.
• Others
  • ACC work is taken over to Type-B team.
    • Fujii-kun is making a report about ACC.

IMMT (Ohishi)

• Started making a schedule but still struggling with Windows installation.
  • By the end of next week
• Wrote a report on BS position measurement in Japanese. Preparing a pictorial version.

Watchdog system (Tanaka)

• Experiment Report.PDF

Safety

• Nothing

Discussion

• LVDT for BF damping (Shoda, Raffaele)
  • The next meeting on July 11th
  • Check if the current design of Virgo LVDT will fit to our systems
  • If so, we will produce them in Japan
  • Two sample LVDTs will be sent to Japan
• Inertial Sensors for Type-B (Mark, Fujii)

Site work plan for the next week

• Mon:Mark and Hirata for BS preparation

• Tue: Mark and Hirata for BS preparation, Takahashi, Okutomi and Ishizaki for Type-A preparation
• Wed: Mark and Hirata for BS preparation, Takahashi and Ishizaki for Type-A preparation
• Thu: Mark (?) and Hirata (?) for BS preparation, Takahashi and Ishizaki for Type-A preparation
• Fri:

Travel Plans

• Travel (Week of 7/4):
  • Takahashi: 4-7 (extended chief meeting, site check for the installation of Type-A)
  • Shoda: 4 (extended chief meeting)

  • Mark:4-6 (preparation for BS installation)

  • Fabian:

  • Okutomi:4-5 (Extended chief meeting + Type-A)

  • Fujii:

  • Ishizaki:5-7 (site check for the installation of Type-A)

  • Hirata:4-6 (preparation for BS installation)

  • Sato:
  • Ohishi:
• Travel (Week of 7/11):

  • Takahashi:11 (Cross tube installation)

  • Shoda:
  • Mark:
  • Fabian:
  • Okutomi:
  • Fujii:
  • Ishizaki:
  • Hirata:
  • Sato:
  • Ohishi:

Mark is away: July 8-20

Next meeting

2016/7/8(Fri) 13:30 - F2F@Mitaka