Differences between revisions 148 and 149
Revision 148 as of 2017-09-20 20:51:55
Size: 4332
Editor: MarkBarton
Comment:
Revision 149 as of 2017-09-25 08:14:23
Size: 3240
Editor: MarkBarton
Comment:
Deletions are marked like this. Additions are marked like this.
Line 22: Line 22:
== 2017-09-19 ==
(No work Monday 9/18)
== 2017-09-25 ==
Line 25: Line 25:
 * --(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)--
  * --(Calibrate F0 LVDT.)--
  * 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, IRM to IM and IM to RM.)--
 * --(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.)--
 * Fix poorly seated head.
 * 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.
Line 64: Line 26:
 * Fix #1 geophone adapter cable.
 * Fix broken pico adapter cable?
 * Debug all electronics, starting with IRM OSEMs.
 * Unlock IP; use jacks and FRs to center.
 * Check IP yaw.
 * Recheck centering of suspension in assembly frame.
 * Measure IP period; adjust ballast mass.
 * Calibrate IP LVDT sensing against IP LVDT actuation, IP FRs.
 * LBB stuff (see below).
 *

=== LBB Sequence
 * Unclamp LBB ring sandwich; fully suspend Cu ring.
 * Unscrew LBB from tank brackets.
 * Hook LBB.
 * Remove TBD amount of spacers from between LBB and tank brackets.
 * Set LBB blade stops to nominal height.
 * Extend foot screws on LBB to just barely support LBB.
 * Adjust height of LBB magnet ring to set proper gap (4 mm??).
 * Retract LBB foot screws.
 * Add temporary ballast to LBB until LBB blades just barely sink below stops.
 * Check distance from LBB to main beam height (or other suitable reference); adjust by screwing receptacles.
 * Set foot screws to give ≈5 mm (or TBD) movement range of LBB below nominal.
 * Set stop on LBB blades to give ≈3 mm (or TBD, less than Cu-magnet gap) of LBB above nominal.
Line 66: Line 52:
 * --(Fix issue with geophone distributor.)--
 * Fix #1 geophone adapter cable (and replace borrowed one).
 * Fix broken pico adapter cable.

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

2017-09-25

Main Assembly Sequence

  • Move in-air cabling and feedthroughs and reconnect in-vacuum cables (through Cu O-rings).
  • Fix #1 geophone adapter cable.
  • Fix broken pico adapter cable?
  • Debug all electronics, starting with IRM OSEMs.
  • Unlock IP; use jacks and FRs to center.
  • Check IP yaw.
  • Recheck centering of suspension in assembly frame.
  • Measure IP period; adjust ballast mass.
  • Calibrate IP LVDT sensing against IP LVDT actuation, IP FRs.
  • LBB stuff (see below).

=== LBB Sequence

  • Unclamp LBB ring sandwich; fully suspend Cu ring.
  • Unscrew LBB from tank brackets.
  • Hook LBB.
  • Remove TBD amount of spacers from between LBB and tank brackets.
  • Set LBB blade stops to nominal height.
  • Extend foot screws on LBB to just barely support LBB.
  • Adjust height of LBB magnet ring to set proper gap (4 mm??).
  • Retract LBB foot screws.
  • Add temporary ballast to LBB until LBB blades just barely sink below stops.
  • Check distance from LBB to main beam height (or other suitable reference); adjust by screwing receptacles.
  • Set foot screws to give ≈5 mm (or TBD) movement range of LBB below nominal.
  • Set stop on LBB blades to give ≈3 mm (or TBD, less than Cu-magnet gap) of LBB above nominal.

In parallel, time permitting

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)
  • Figure out how to make PI yaw adjustment reliable.

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.

KAGRA/Subgroups/VIS/TypeB/ToDoBS (last edited 2019-01-04 15:21:23 by MarkBarton)