Differences between revisions 107 and 109 (spanning 2 versions)

Vent plans

Vent Fall 2021

* 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].

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

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

(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.

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

(5) New periscope plate

(6) Cavity scattering measurements? (Jan)

(7) Loss Measurements

(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 107 as of 2020-09-23 21:42:20 → 
  Size: 5158
  Editor: GautamvenugopalanATligoDOTorg
  Comment:
+   ← Revision 109 as of 2021-10-06 21:13:21 → ⇥
  Size: 5287
  Editor: AnchalguptaATligoDOTorg
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
+== Vent Fall 2021 ==

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