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
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=87589|spec in DCC]]
 * quotes:
   * --([[https://wiki-40m.ligo.caltech.edu/vent?action=AttachFile&do=get&target=ATF.pdf|ATF]])--
   * '''[[https://wiki-40m.ligo.caltech.edu/vent?action=AttachFile&do=get&target=Laseroptik.pdf|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_Layout#PR3SR3|Optical table layout needs to be modified]]
 * --([[http://nodus.ligo.caltech.edu:8080/40m/6907|optics in hand]])--
 * __'''''phase map of mirror, in and out of tip-tilt mounts'''''__
   * '''''what resolution do we need?  Need to measure curvature.'''''

(2) [[Suspensions/Tip_Tilts_IO|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
   * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=77367|hexagonal]]
   * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=77543|diamond shaped]]
   * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=77545|diamond shaped (2inch)]]
 * --(manufacture)--
 * pedestals, clamps?
 * '''''bake'''''
 * assemble

(4) OSEM mount screws
 * requirements:
   * Hex-top, longer, sliver-plated
   * Qty = 100
   * No-plastic
 * '''[[http://nodus.ligo.caltech.edu:8080/40m/6472|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