VIS Type B To-Do List

Archived items are at ../ToDoOld.

Paper

• Review Type Bp paper

• Choose paper title -> "Vibration isolation systems for the beam splitter and signal recycling mirrors of the KAGRA gravitational wave detector"

• Create JGWDoc number for paper -> P1909836

• Decide paper author list -> KAGRA Author List 2019?

• Write Type B paper abstract

• Write paper outline

• Write Type B paper "Introduction"

• Vibration isolation systems in KAGRA

  • Write "Overview"

    • Steal or reproduce Type Bp Figure 1 (optic layout)
    • Steal or reproduce Type Bp paper Figure 2 (suspension comparison)
• Write Requirements for Type B
• Write "Design of the Type-B suspension"

  • Write "Mechanical"

    • Choose photo of Type B suspension in mid-air
    • Make diagram of Type B in vacuum chamber
  • Write "Sensors and Actuators"
    • Write "Optical Levers"
  • Write "Control and Damping"
    • Make controls diagram like Type Bp paper Figure 7
• Write "Measured performance"
  • Write "Damping Time"
    • Make decay time plot like Type Bp paper Figure 8
  • Write "Residual Velocity"
  • Write "Residual Angular Fluctuations"
  • Write "Vibration Isolation Performance"
• Write "Summary"

• Write "Acknowledgments" -> Used 2018-09 version - need to check if there's a newer one.

• Compile "References"

  • Find NS-NS detection reference

  • Find initial detection reference

  • Find Type A reference
  • Find cryogenic payload reference
  • Find bKAGRA reference
  • Find LIGO-India reference

Tunnel

• Tidy up.
• Move charging station to more convenient location (e.g., near -X entrance).
• Find and inventory all gluing tools.
• Put pointy-tipped screw in RM trolley for BS
• Put First Contact on SRM-W optic and install it in its holder with 1.4 mm shims ready for possible use.
• Check all pico drivers are on extension cords that can be unplugged from outside the cleanbooth (in case reset is needed).

BS

• Add Tanaka-san's LVDT signal card.

SR2

• Add Tanaka-san's LVDT signal card.

SR3

• Add Tanaka-san's LVDT signal card.

SRM

• Add Tanaka-san's LVDT signal card.

Shakedown/Characterization

BS

• Measure decay time, rms with and without control.
• Do geophone blending.

SR2

• Measure decay time, rms with and without control.

• Do FEA model of IRM side plates.

• Do geophone blending.

SR3

• Measure decay time, rms with and without control.
• Put SR3 cleanbooth electronics in minirack.
• Check pico adapter cables.
• Do geophone blending.

SRM

• Check where SRM pico cables came from and make sure there isn't one missing somewhere else.
• Debug 240 Hz noise in LVDT.
• Measure decay time, rms with and without control.
• Check keystone lock screws in BF (on next vent).
• Do geophone blending.

SDF

• Document SDF in Operations Manual
• Make SDF states for Type B, e.g.:
  • SAFE
  • DCCTRL-ONLY
  • ALIGNED-IN-AIR
  • ALIGNED-IN-VACUUM

MEDM

• Fix DAC screen (split model issue).
• Move overview.txt files from common to k1, edit screens

Guardian/RTM

• Rethink Guardian to avoid going back to SAFE for minor problems.
• Consider splitting Type B Guardian into tower and payload sections with possible third monitor Guardian overseeing both.
• Make cycle times of BS models the same as for SRx.

• Change the DAQ channel lists per Shoda-san's final design.

• Remove TM_OSEM subsystem from payload model.
• Remove GEOWHITEN from IP of top model.

• Remove ISIINF->CART2EUL->ISIWIT from IM.

• Add temperature alarms.
• Add alarms for LVDT actuation near limit (especially for GAS).
• Add alarm for integral runaway in DCCTRL loops.
• Change value of nominal in Guardian to 'ALIGNED' or the like.
• Add secondary watchdog with lower threshold that puts all outputs to HOLD and then gets Guardian to ramp them down.

Simulation

• Create controls design description (cf LIGO-T1100378).

• Get a good set of TFs and put them in a common directory:

  • Directory: /kagra/Dropbox/Subsystems/VIS/TypeBData/SR2/simulation/TF/

  • Content: diaggui xml files and regular text files.

• Compare the Matlab prediction with the measurements.

  • In a reasonable way tune the parameters of the simulation in ordet to get a good agreement.

  • It should include resonant peaks not predicted by the simulation.

  • Write a klog about this.

• Given the fact that Takanori's Matlab simulation provides the TFs in units of [m/N] calculate a calibration factor for each GAS LVDT and IP and IM virtual actuator, which are in units of [µm/cnt].

• Collect the measurements of LVDT and OSEM readout noise and put them in a common directory:
  • Location: /kagra/Dropbox/Subsystems/VIS/TypeBData/SR2/simulation/sensor_readout_noise/
  • Content: duaggui xml files and regular text files.
• Check Panwei's measurements of OSEM noise. Pay special attention to the conversion into m/rtHz from V/rtHz.
• Calculate the readut noise of the virtual sensors from the readout noise of the real ones.

  • IP LVDT.

  • IP Geo: where's the data for SR2 geophones? There's information in entry 6106. For SRM the plots are at 8177 but where's the data?

  • GAS LVDT (no virtual sensors)

  • IM OSEMS

  • Oplev
• Estimate coil driver noise. It seems this is not expected to contribute significantly but we should still know.
• Convert real actuation noise to virtual actuation noise.

• Check whether the Matlab simulation implements the output of the length sensing oplev.

• Extract the filters designed by Enzo, Terrence and Lucia from the filter bank using Foton and write them in a format compatible with Takanori's simulation: IP LVDT, IP GEO, blending filters, GAS, IM, optic.

• Check the whether the oplev takes into account the ground motion movement in

  • longitudinal displacement: NO

  • Pitch and yaw
• In the simulation, what are the assumed coupling between

  • LVDT-L ==> OpLev-PTM.

  • IP GEO-L ==> OpLev-PTM.

  • Longitudinal ground motion ==> OpLev-PTM.

  • OSEM-L ==> OpLev-PTM

  • And the above quantities with Oplev-YTM.
• Does the simulation take into account the 1/300 rads of the tunnel slope?
• In the software modify the control feedback loop topology in order to have the same as in the real system.
• Tune the filters in order to account for the differences between simulation and measurement.
• As sanity check for the simulation, check the stability criteria and compare with Enzo's.
• Ask whether there is a recent measurement of seismic motion at the the central room.

Electronics

• Pick better resistor values for sat amps (to give closer to 32K open-light values).

• Install Tanaka-san's LVDT sig gen cards when available). Update Status and electronic item lists.

• Install Tanaka-san's hardware watchdogs. Update Status and electronic item lists.

• Enable stepper remote enable system (flip enable switches on stepper drivers) and do final test.
• Update BS Circuit diagram, D1503600

  • Make generic to Type B.

  • Note removal of LED/PD on TM OSEMs.

  • Add stepper remote enable system.

  • Add note about gender-changers and non-flipping feedthrough adapters.

  • Correct default stepper channel assignments and link to wiki for changes.

  • Remove note about steppers with limit switches (we didn't use them).

  • Include LVDT pin size (1 mm).

  • Include Stepper pin size (1.6 mm).

  • Undo renumbering of IP items.

  • Page 10: "DIO Card # 0" should be "DIO Card # 1"

  • Include OutConfigBoards on OL page (Sheet 18).

  • Update HPCD section to reflect:

    • All three GAS channels are on HPCD #1 and DIO Card #2, CNB cables, Sheet 13.

    • Three IP channels are on HPCD #0 and DIO Card #2, CNA cables, Sheet 15.

  • Include blank page for watchdog.

  • Include actual watchdog.

  • Include information on assignment of channels to feedthrough positions (or summarize on wiki and add link).

Documentation and Operation Manual

• Get scan of Enzo's notebook and post to JGWDoc.
• Get scan of Terrence's notebook and post to JGWDoc.
• Add useful info from notebooks to BSData/etc.'
• Improve Thermometers page of Operations Manual.
• Improve SDF page of Operations Manual.
• Improve vistools.py page of Operations Manual (Mark).
• Add Cameras page to Operations Manual.
• Add ndscope page to Operations Manual.

OLs

• Design/procure/install permanent hard protective covers.
• Consider getting camera covers as well (to stop light getting in and IR getting out).
• Tweak whitening filter gains.

One Day, If Ever Needed

BS

• Tune BS LBB (adjust table height, damper height) - DON'T BOTHER (unless there's an excuse to open the lower half of the tank).
• Replace BS F0 thrust bearing - BIG JOB - NOT WORTH IT.
• Replace BS F0 yaw adjuster - DO AT NEXT VENT AFTER PARTS ARE AVAILABLE.
• Consider flipping sign of H2 coil actuator (there is a -1 in COILOUTF for it).

SR3

• Replace chipped magnets (12x12x12 mm) in SR3 IP, H1 and H2.

SRM

• Install Enomoto-kun's beam target plate (if/when available).