Differences between revisions 70 and 111 (spanning 41 versions)

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.

Take back the 70% light split off to the OMC in the AS path.
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
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

-  ⇤ ← Revision 70 as of 2012-08-22 21:48:26 → 
  Size: 3611
  Editor: JamesonrollinsATligoDOTorg
  Comment:
+   ← Revision 111 as of 2021-10-06 21:16:22 → ⇥
  Size: 5256
  Editor: AnchalguptaATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
+* [[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
-Line 16:
+Line 47:
-(2) Active tip-tilts (Suresh/Jamie)
+(2) [[Suspensions/Tip_Tilts_IO|IO Active tip-tilts]] (Suresh/Jamie)
-Line 68:
+Line 99:
-(7) Review IP{ANG,POS} alignment/closeup proceedure
+(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?
-Line 70:
+Line 111:
-== tip-tilt wiring ==
+(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)
-Line 72:
+Line 131:
-{{attachment:40m-tt-wiring.svg}}
+(9) Review IP{ANG,POS} alignment/closeup proceedure
-Line 74:
+Line 133:
-relevant pictures:
 * BSC table, from north, above output PZT0: [[https://picasaweb.google.com/foteee/BSchamber_general_2July2012#5760738286971644386|1]], [[https://picasaweb.google.com/foteee/InVacWork4Aug2011#5637286023354525762|2]]
   * '''''Do we have 3 available 25-pin connectors on BSC table??'''''
 * IOO table, from west, through AC, input PZT0 detail: [[https://picasaweb.google.com/foteee/InVacWorkNov232010#5544001991913055442|1]], [[https://picasaweb.google.com/foteee/InVacWorkNov232010#5544002001413250658|2]]
   * '''''It looks like we have (or will have) 1 available 25-pin connector on IOO, which is all we need!''''' 
 * OMC table, from east, through AC, output PZT1 detail: [[https://picasaweb.google.com/foteee/InVacWork4Aug2011#5637288817950887378|1]], [[https://picasaweb.google.com/foteee/InVacWork4Aug2011#5637288262639879746|2]]
   * '''''unclear what is available here'''''
-Line 83:
+Line 135:
+ * [[vent/201812 |2018 October]]
 * [[vent/201610|2016 October]]
 * [[vent/201605|2016 May-August]]