= 40m work plan (edited Jun 2017) =

== Planning ==
[[https://docs.google.com/spreadsheets/d/10pod0tRMSwmlSHKBv8u4G1ETmIn639GabQRUY-wFuH0/edit#gid=0 | This google document]] collects some project ideas for the short/medium/long term. 

Some ongoing projects (in rough order of priority), updated on Jun 5 2017:
 * DRMI locking + noise budgeting
 * Characterization + improvement of SOS drive chain electronics
 * BHD @40m - design + modeling
 * Finesse modeling of various IFO configurations for comparison to measurements
 * WFS sensing matrix measurement 
 * MCL optimal feedback loop design
 * Measurement of losses in recycling cavity - inject beam from AS port?

== Long term future ==

 * The 40m could be the prototype interferometer for the third generation interferometer
 * In particular, if we decide to use Silicon test mass at longer wavelength, we want to accumulate experiences with the new type of devices (mirrors, crystals, noises, laser stabilization, etc)

 * This project should start once the baseline concept of the third generation IFO is fixed and the basic table-top R&Ds show supportive results.

 * What kind of tests do we want to do at the 40m? Quantum? Thermal? 

== Mid term future ==

 * '''How can we make the 40m useful for aLIGO?'''

 * TCS testing with the tip-tilt suspensions. Which tip-tilt? What to be tested? What to be measured? TT+IFO? TT+OMC?

 * TT sus improvement. Request help of LIGO Engineering. Make it tall. Run shaker tests. Once they are OK off-line, replace the TTs in-vacuum.

 * Scattering measurements. Characterize the low to high angle scattering to investigate the relationship between the phasemap and the scattering. Utilize the advantage of having ATF-coated mirrors and (sort of) long arms. This is related to the mirror cleaning.

 * OMC resurrection/upgrade. What's the motivation?

 * Control related topics?

== Near term targets ==

 * How to make the lock indefinite.

 * What to do with DRFPMI? (Transition to 1f signals, sensing matrix, open loop TF, cavity pole measurement)

 * Implementing LSC feedforward cancellation (e.g. actuation FF MICH->PRM (seems OK now), MICH->SRM (not great)
   MICH->DARM, PRCL->DARM, SRCL->DARM

 * Can we write a paper only with the locking of DRFPMI? How? Do we need to combine it with something else?

 * Modulation cancellation technique to further reduce CARM coupling into 3F signals during ALS CARM/DARM reduction.

 * Vent
   * Pre-vent: ifo loss measurements (PRG, Arm refl, Arm scans, Loss measurement with the spot position scanned)
   * Pre-vent: Any independent measurements? (Scattering, spot cameras, etc)
   * Venting: Arm mirror wiping, arm length change? Just adjust the difference? Do we change the arm length concept?
   * Venting: Any other modification? Do we want a scattering measurement setup?
   * Venting: Cold cathode, convectron installation.
   * Post-venting measurement.

 * ISS

== Paper worth topics ==

 * DRFPMI?

 * Delayline Freq Discriminator / Phase Tracker
 
 * Scattering characterization

 * Modulation cancellation

 * Other control related topics (e.g. CESAR, ESCOBAR, ALS FOL)

----

= Old materials. To be merged to the above info =

This should be kept up-to-date.  This is an overview of our near-term goals.  We can link to other TODO lists from here.

== PRMI commissioning ==

 * PRMI locked!
 * Investigate triggering (trigger on POP110 instead?)
 * What is the correct normalization?
 * Lower Q on Vio2 filters

 * Finish updating IFO configure scripts, medm "restore" (Jamie)

 * OSA modulation depth measurements at:
   * REFL
   * AS

 * Power budget at all available ports, include 1f(22)/2f(110)
   * PRC gain

 * --(Oplev calibration (BS? PRM?))--

 * Sensing matrix
 * Cavity length (use new Anamaria method)
 * Loop gain (make sure loop is stable for measurements)
 * Noise budget

 * Full Finesse model.

 * Fix hardware anti-aliasing in LSC (move up cutoff freq to correspond to sample rate)

== DRMI ==

This and FPMI are the next primary tasks.  '''''We will need to vent to flip SR2 first,''''' although we need better calculation of the PRC/SRC coupled-cavity affect on the SRC mode.

 * SRC mirror RoC calculations.  What is the long-term solution? (Jamie)

== End table upgrade ==

This is needed before we move on the FPMI commissioning.

 * [[endtable_upgrade|Project page]]

 * ETMY table must be completed ASAP (Manasa)
   * What is left to do?

 * ETMX upgrade needs to be planned/coordinated.

== FPMI ==

We obviously need both end tables fully functional before we get to this.

== PRFPMI ==

 * Oplev calibration for ETMX, ETMY

== DRFPMI ==

== Next vent ==

Will need to vent soon to flip SR2.

 * SR2 flip
 * Are all black glass beam dumps installed?

Longer term:

 * New OSEM mount screws
 * New periscope plate