== 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].

== Summary ==
The primary objective is to re-glue the [[https://nodus.ligo.caltech.edu:8081/40m/15585|fallen-off magnet on ETMY]]. While we have the main volume vented, we could use this opportunity to do the following, keeping in mind the limited personnel availability.

 1. Clean ETMY.
 1. Best effort to put ETMY back in and reduce the required YAW slow bias voltage (so we can maybe use this as the testbed for the HV coil driver circuit).
 1. Bypass the in-vacuum OMC and recover the full AS beam power for use on the AP table. Also, extract the copper OMC and DCPDs. This would likely help commissioning, the added complexity is that we have to remove an extra door. Also need enough balast weight to balance table.
 1. '''Replace main volume pressure gauges.''' We are down to only one functioning pressure sensor in the main volume, which is a Pirani gauge that only works above 1e-4 torr. See [[https://nodus.ligo.caltech.edu:8081/40m/15577|eLOG 15577]] for the suggested replacement.

== Inventory required for re-gluing magnet and re-suspending optic ==
The assembly procedure may be found [[attachment:E970037-F.pdf|here]].
 1. Magnet re-gluing fixture.
 1. EP-30.
 1. Spare wire clamps for re-suspending optic in cage.
 1. Suspension wire.
 1. Clean torque allen ball driver to tighten (but not over-tighten) SOS wire clamp.
 1. Acetone to remove the magnets in preparation for re-gluing (do we need to take the remaining magnets off first? or just re-glue the one that fell off?).
    * check other magnets for solidity
    * aim to only de-glue the broken one
 1. Glass container and teflon pieces to soak optic in if removing existing magnets is necessary.
 1. HeNe + QPD to check pitch balancing once optic has been re-suspended.
 1. CDS infrastructure for testing optic diagonalization once we have re-suspended the optic.

== Inventory required for optic cleaning ==
 1. Spectroscopic grade methanol, isopropanol, acetone. Chub has ordered.
 1. metal glass syringesss
 1. First contact kit (F.C., brushes for application, clean glass containers, acetone, Peek Mesh, green flashlight, tweezers/scissors).
 1. Camera.