VIS Type B BS Near Term To-Do List

Archived BS To-Do Items

SR To-Do Items

Every Week

Coming Weeks

Every Week

Facilities

• Vacuum and roll floor.
• Wipe ladders.
• Tidy tools, parts.

• Get stuff from ../WishList

2017-09-19

(No work Monday 9/18)

Main Assembly Sequence

• Debug BF LVDT actuation.

• Check F0 yoke height (top of coil former should be 37.5 mm above bottom of recess in top of baseplate) 36mm.

• Test all PI items:
  • Yaw stepper (tested, not clearly working).
  • F0 LVDT sensing
  • F0 LVDT actuation
  • Horizontal LVDT sensing
  • Horizontal LVDT actuation
  • Geophones (issues with driver, cables, descramblers)

• Lock the F0 and SF keystones and measure the resonance frequency of the BF GAS 2 Measurements: f1=0.443 Hz, f2=0.454 Hz.

• Lock the SF and BF keystones and measure the resonance frequency of the F0 GAS 2 Measurements: f1=0.208 Hz, f2=0.210 Hz.

• 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.

Tank Preparation Sequence

• Attach Cu segments to LBB damper ring.
• 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).

In parallel, time permitting

• Fix issue with geophone distributor.
• Fix #1 geophone adapter cable (and replace borrowed one).
• Fix broken pico adapter cable.
• Figure out how to tighten PI yaw return spring or otherwise make yaw adjustment reliable.

Tasks Not To Forget

Major Tasks

• Update BS Install Procedure with screenshots from new on-assembly-frame 3D CAD.
• Finish assembly drawing for LBB and LBB damper ring and post on JGWDoc (Hirata-san).
• Get pico drive screens fixed (Miyo-kun)

Minor Tasks

Mechanical

• Get clean bag laundered.
• Put pointy-tipped screw in RM trolley for BS
• Return/replace borrowed parts:
  • Lock washers for LBB dampers
  • Temporary ballast mass (dog clamps) in BF.
• Swap in new F0-SF maraging rod (with 8-mm heads) and new receptacles to match.

Electrical

• Decide final in-vacuum and in-air cable routing (Enzo).

• Calibrate all LVDTs (Enzo, Mark). BF, SF, PI-GAS, PI-H1, PI-H2, PI-H3

• Adjust yoke on PI to put top of secondary at TBD mm above top of baseplate (or to give ≈0 counts at nominal height).

Real-time and SUMCON models

• Create SUMCON models for full BS and major installation milestones.

• Create controls design description (cf LIGO-T1100378).

• Make table of ADC/DAC assignments and check for consistency with D1503600 and k1visbs (Enzo, Mark)
• Understand/document/debug Kokeyama-san's DIO stuff.
• Measure LPCD and HPCD output filter response.
• Design and install software compensation filters for LPCD and HPCD output filters.
• Design and install GAS drift compensation filters.