Vent plans

Vent Fall 2021

Planning page for Vent in Fall 2021

• pre-vent/pre-closeup checklists

Tasks for Vent of Fall 2020

* Primary objective - re-glue broken magnet on ETMY and re-suspend it.

1. Take back the 70% light split off to the OMC in the AS path.
2. Investigate TT hysterisis [low priority as this would require 3rd door to be off].

planning page

Tasks for Vent of May 2019

• Primary objective - Suspension diagnosis

  1. Fix ETMY (one eigenmode missing?) and ITMY (frequently gets stuck) suspension
  2. Check that the AS beam exits the vacuum cleanly. Take back the 70% light split off to the OMC in the AS path.
  3. Investigate TT hysterisis

Tasks for next vent after Aug 30 2017 - not in any particular order

• Installing new RC folding mirrors, PR3 and SR3 (we need to get the actual optics + new Tip-Tilt suspension design)
• Flip existing PR2 and SR2
• Installation of Ruby standoffs for selected optics (we need to get a better magnet gluing fixture ready)
• MC1 suspension inspection and fixing
• ITMX magnet re-gluing
• Baffling (?)
• Installation of steering mirrors to facilitate viewing of optic faces with GigE cameras
• FC cleaning

Prep for next vent

(1) Dichroic mirror replacements for PR3 and SR3

• spec in DCC

• quotes:

  • ATF

  • Laseroptik (final)

    • note: 2 deg wedge quote has Fused Silica grade F = 5 ppm homogeneity & micro roughness 0.3 nm RMS, Rana OKed both, 3 wks delivery, Jamie takes care of ordering

• Optical table layout needs to be modified

• optics in hand

• phase map of mirror, in and out of tip-tilt mounts

  • what resolution do we need? Need to measure curvature.

(2) IO Active tip-tilts (Suresh/Jamie)

• Suresh is going to LHO April 15-25 for assembly/shipping of tip-tilts

• tip-tilts:

  • tip-tilts from LHO

  • bake

  • assemble

  • add mirrors
  • level
• in-vac cables (quadrapuses)

  • ship parts to RND Cables

  • place order with RND Cables

  • bake
• electronics:
  • gather components:
    • DAC
    • anti-image filters
    • dewhite filters
    • coil drivers
    • eurocrate
    • cables
  • install
  • test in DAQ

(3) Black glass beam dumps

• Large baffle style covers for the suspensions
• Small V-shape pieces for generic purpose

  • hexagonal

  • diamond shaped

  • diamond shaped (2inch)

• manufacture

• pedestals, clamps?

• bake

• assemble

(4) OSEM mount screws

• requirements:
  • Hex-top, longer, sliver-plated
  • Qty = 100
  • No-plastic

• final design

• manufacture

• bake

• ready to install

(5) New periscope plate

• manufacture

• bake

• ready to install

• need shorter pedestals for green PBS and beam dump

(6) Cavity scattering measurements? (Jan)

(7) Loss Measurements

• Improve resolution in the scope

• Configs to measure:

  • X-arm misaligned
    • validate insensitivity to misalignment
  • Y-arm misaligned
    • validate insensitivity to misalignment
  • ~3-5 different beam positions each

• Analysis

  • Sources of error?

(8) OMC Commissioning

• Electronics

  • DB-? cables from the DAC to HV drives
  • Goal is to align onto OMC trans PDs
  • Extra PD on AS table can be used for 'backup' in-air PD

• Locking Script

  • Scan the OMC cavity before the vent, make sure script works
  • Lock before vent to ensure procedure makes sense.

• Chambers to Open

  • OMC Chamber only

• Align into PDs

  • Lock OMC using OMC REFL signal
  • Align transmitted beam into TRANS PDs
  • Will require ~1 day of work

• Backup Plan

  • If the PDs don't work as expected, steer beam to the AS table
  • Rotate and move (+x) SM5, which directs the beam to the TRANS PDs
  • Beam will come out near the current AS beam
  • may have to remove one extra steering mirror (SM5 trans PO)

(9) Review IP{ANG,POS} alignment/closeup proceedure

Previous

• 2018 October

• 2016 October

• 2016 May-August

• 2011 July

• 2010 July

• 2009 Dec

• 2006 September

• IFO Upgrade 2009-2010