Detailed Vent Plan:

-1) Preparations for vent:

• Steve will prepare baseline readings for IOOPOS, IOOANG, IPPOS and IPANG QPDs,
  • all the oplev QPDs, and any/all other QPDs that are useful.
• We might want to lock the arms, and take baseline trends
  • of the DC power on all the photodiodes that can be trended.
• Shall we keep the MC2 QPD on the transmitted beam,
  • or move it back to the oplev beam?
• Osamu will prepare a detailed plan for the OSEM work.
• Rana will lock the arms and measure the angle-to-length couplings
  • of the ITMs. If the beam is not centered horizontally on ITMX, we can think about moving it during the vent.

-0.5) Establish SRM + OO table alignment, as referenced to AP table

• Install fixed mount fiber launch at AP. This will be like a long, IR oplev.
• Verify that this fiber beam is co-linear with current darkport beam.

0) Fill Vacuum with Air

1) Remove Doors and Access Connectors:

• OO: ND and AC
• IO: AC
• BSC: ND and ITMY AC
• ITMY: AC
• ITMX: ND
• MC2: ?

2) Fix OSEMS on MC2, BS, PRM

Maybe wait on SRM till the end, since it is our reference for aligning the back-propagating beam from the DC PD, retroreflecting off of the SRM back to the DCPD.

Mis-align MC2 to prevent flashes?

2.5) Install half-wave plate to rotate polarization into the MC.

3) Install DC readout optics

• position electronics, wiring, and other necessary equipment near the OOC for biasing the TT PZTs,
  • locking the OMC, and alignment.
  • Necessary equipment includes, but is not limited to:
  • PZT driver (OMC L)
  • Lock-in Amp (SR830)
  • Cabling (many BNCs), cross-connects for Vacuum flange
  • SR560
  • fibercoupled laser
  • High-Voltage power supply (for TTPZT), with cabling and cross connects to power mirrors in TWO chambers.
  • Power supply for DC PD
  • Four channel color scope
• Measure levelness of OO table with bubble
• Measure levelness of BSC table with bubble
• Measure levelness of ITMX table with bubble

• place iris on OO table, using CrystaLaser beam as reference.

• plase iris(es?) on BSC table, using CrystaLaser beam as reference.

• Move OMMT assembly to OO chamber, place according to drawing.
• Place 4 spherical washers to support OMC breadboard.
• Move, and place OMC breadboard.
• Remove handle from OMC breadboard.
• secure OMC breadboard and OMMT to table.
• run wiring, establish signals from DC PDs.
• Install TTPZT1 on BSC table and TTPZT2 on OOC table
• Run wiring from BSC to ITMX. Disconnect ITMX flag picomotor wiring. and replace with TTPZT1 wiring.
• Check that both TT PZTs can be powered and biased. Simultaneously!
• Attach cable for OMC length PZT, wire up a solution to drive it. Test that it works properly.
• Remove DCPD, install second fiber launch in its place. Lock the OMC backwards.
• Install RF pickoff mirror and next steering mirror.
• Place remaining optics rougly on table, including squeezer optics.
• Measure levelness of OO optic table.
• Relevel the table, using the bubble.
• Verify alignment of fiber beam 2 through OMC, OMMT, RF pickoff mirror, to PZT2.
• Bias tip-tilt PZT2 to the middle of its range.
• Align PZT2 to hit the AP steering mirror1, f-beam 2 to hit SRM and retroreflect to the OMC
• Remove AP steering mirror 1, replace with TTPZT1.
• Bias PZT1 to middle of its range.
• Align PZT1 so beam hits center of SRM, and then through to centers of ITMX and ITMY.
• Align RF pickoff mirror so back-reflection from SRM
  • can exit chamber. This beam can then be made co-linear
  • with that from the first fiber, by moving a steering mirror on the
  • AP table.
• Place OMCT mirror.
• Now the f-beam 1, coming from the original AP table and retroreflecting from the SRM, should be
  • visible near the input to the OMC.
• Verify that OMCR and OMCT beams exit chamber.
• remove Thorlabs diode used for locking OMC backwards.
• Test that the OMMT and squeezer mirror picomotors can be controlled from the outside.
• Comission the squeezer optics.
• Relevel table again if movement occurs;
  • if so, double check alignment of fiber beam to SRM and back, and that APRF, OMCR, OMCT beams exit the chamber.

4) Fix OSEMS on SRM

5) Pack up and get out.