• vent
• oldUnknownTime

This was previously listed in the vent planning page without any dates. Not sure when this work was done or planned for.

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