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* [[vent/checklist|pre-vent/pre-closeup checklists]]

== Vent Fall 2021 ==

[[vent/planningFall2021|Planning page for Vent in Fall 2021]]
----

== 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.
   1. Investigate TT hysterisis [low priority as this would require 3rd door to be off].
[[vent/planningFall2020|planning page]]
----

== Tasks for Vent of May 2019 ==
 * '''Primary objective''' - Suspension diagnosis
   1. Fix ETMY (one eigenmode missing?) and ITMY (frequently gets stuck) suspension
   1. Check that the AS beam exits the vacuum cleanly. Take back the 70% light split off to the OMC in the AS path.
   1. 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
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(1) Dichroic mirror for recycling cavities (Kiwamu)
 * Figure out required spec
    * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=87589|spec in DCC]]
    * wedge angle = 2 deg
    * dichroic mirror 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]]
    [[https://wiki-40m.ligo.caltech.edu/vent?action=AttachFile&do=get&target=Laseroptik2dw.pdf]]		 (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.'''''
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    * [[Optical_Layout#PR3SR3|Optical table layout needs to be modified]] (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
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 * Get a quote from ATF.
 * Qty = 3 (2 + 1 spare )
 * Start ordering (in a week)

(2) Black glass beam dumps (Koji)		 (3) Black glass beam dumps
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 * --(manufacture)--
 * pedestals, clamps?
 * '''''bake'''''
 * assemble
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(3) OSEM mount screws (Steve)
 * Hex-top, longer, sliver-plated
 * Qty = 100
 * No-plastic
 * http://131.215.115.52:8080/40m/6232		 (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'''
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(4) Active tip-tilts (Suresh/Jamie)
 * Electronics
 * Cables including vacuum-compatible ones and the non-vacuum ones
 * Prepare mirrors
 * Assembly and baking
 * Prepare feedthrough connectors
 * Digital controls		 (5) New periscope plate
  * --(manufacture)--
  * --(bake)--
  * '''ready to install'''
  * __'''''need shorter pedestals for green PBS and beam dump'''''__
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(5) OMC activation (Jenne)
 * Calculate the mode matching solutions and prepare appropriate telescopes
 * Draw optical layout
 * Digital controls		 (6) Cavity scattering measurements? (Jan)
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(6) OSEM upgrade (somebody)
 * Need a discussion		 (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
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 * [[vent/201812 |2018 October]]
 * [[vent/201610|2016 October]]
 * [[vent/201605|2016 May-August]]

Vent plans

* pre-vent/pre-closeup checklists

Vent Fall 2021

Planning page for Vent in Fall 2021

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

(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

(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

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vent (last edited 2021-10-27 19:08:20 by AnchalguptaATligoDOTorg)