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| == Vent Fall 2021 == [[vent/planningFall2021|Planning page for Vent in Fall 2021]] ---- |
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| == 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]] |
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| == Tasks for Vent of Nov 2018 == * '''Primary objective''' - carry out upgrade of the vacuum control system to Acromag 1. Do we have necessary hardware? 1. Steve has acquired some test Serial->Ethernet converter, needs to be checked and interfaced. 1. use the Polaroid / GoPro to film Steve. |
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| * ''Secondary tasks'' - depends on how many chambers we want to open: 1. Fix clipping situation in Y arm. 1. ETMX suspension cage yaw rotation. 1. SRC length adjustment to allow [[https://nodus.ligo.caltech.edu:8081/40m/14164|Signal-Recycled]] locking. 1. Clean arm cavity optics with first contact. 1. Commission existing OMC. 1. Bring back IP POS/ANG ? |
== 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 |
Vent plans
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].
Tasks for Vent of May 2019
Primary objective - Suspension diagnosis
- Fix ETMY (one eigenmode missing?) and ITMY (frequently gets stuck) suspension
- Check that the AS beam exits the vacuum cleanly. Take back the 70% light split off to the OMC in the AS path.
- 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
- quotes:
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
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
- gather components:
(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
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
- X-arm misaligned
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