VIS Type B To-Do List

Archived items are at ../ToDoOld.

Every Week

Coming Weeks

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 Section 1 Introduction
• Vibration isolation systems in KAGRA
  • Write Section 2.1 Overview
    • Steal or reproduce Type Bp Figure 1 (optic layout)
    • Steal or reproduce Type Bp paper Figure 2 (suspension comparison)
• Write Section 2.2 Requirements for Type B
• Write Section 3 Design of the Type-B suspension
  • Write Section 3.1 Mechanical
    • Choose photo of Type B suspension in mid-air
    • Make diagram of Type B in vacuum chamber
  • Write Section 3.2 Sensors and Actuators
  • Write Section 3.3 Control and Damping
    • Make controls diagram like Type Bp paper Figure 7
• Write Section 4 Measured performance
  • Write Section 4.1 Damping Time
    • Make decay time plot like Type Bp paper Figure 8
  • Write Section 4.2 Residual Velocity
  • Write Section 4.3 Residual Angular Fluctuations
  • Write Section 4.4 Vibration Isolation Performance
• Write Section 5 Summary
• Write Section 6 Acknowledgments
• Write References Section
  • Find Type A reference
  • Find cryogenic payload reference
  • Find bKAGRA reference
  • Find LIGO-India reference
  • Find NS-NS detection reference
  • Find initial detection reference

Every Week

• Vacuum and roll floor.
• Wipe ladders.
• Tidy tools, parts.

• Get stuff from ../WishList

2019-04-08

Etc

• Health checks of suspensions before pump down.
• Tidy up.
  • Move charging station to more convenient location (e.g., near -X entrance).
  • Find and inventory all gluing tools.
• MEDM
  • Fix DAC screen (split model issue).
• Real-time and SUMCON models
  • Add temperature alarms.
  • Add secondary watchdog with lower threshold that puts all outputs to HOLD and then gets Guardian to ramp them down.
• SDF
  • Document SDF in KOM
  • Make SDF states for Type B
    • SAFE
    • DCCTRL-ONLY
    • ALIGNED-IN-AIR
    • ALIGNED-IN-VACUUM

BS

SR2

• Measure decay time, rms with and without control.
• Do FEA model of IRM side plates.

SR3

• Put SR3 cleanbooth electronics in minirack.
• Check pico adapter cables.

SRM

• Check pico adapter cables.
• Debug 240 Hz noise in LVDT.
• Check keystone lock screws in BF (on next vent).

Simulation

• 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 filter, GAS, IM, optic.

• In the software modify the control feeback 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.

Minor Tasks

Mechanical

• Put pointy-tipped screw in RM trolley for BS

Electronics

• Pick better restore values for sat amps.
• Install Tanaka-san's LVDT sig gen cards (when available).
• Test stepper remote enable system.
• Update BS Circuit diagram, D1503600

  • Note removal of LED/PD on TM OSEMs.

  • Add stepper remote enable system.
  • Include watchdog.
  • Include information on assignment of channels to feedthrough positions.
  • Reflect gender-changers and non-flipping feedthrough adapters.
  • Add default and as-built stepper channel assignments.
  • Reflect actual cable lengths.
  • 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.

Real-time and SUMCON models

• Add temperature alarms.
• Add secondary watchdog with lower threshold that puts all outputs to HOLD and then gets Guardian to ramp them down.
• Change cycle time of SR models to match BS (2K payload and 16K top).

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

• Make table of ADC/DAC assignments and check for consistency with D1503600.
• Understand/document/debug Kokeyama-san's DIO stuff.
• Measure LPCD and HPCD output filter response.
• Design and install software compensation filters for LPCD and HPCD output filters.

Guardian

Documentation and Operation Manual

• Add useful info from Enzo's notebook to BSData/etc.

OLs

• Design/procure/install permanent hard protective boxes.

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 and yaw adjuster - BIG JOB, DON'T BOTHER (unless lack of yaw adjustment becomes a major problem).

SR3

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

SRM

• Install Enomoto-kun's beam target plate (if/when available).
• Put FC on SRM-W and install it in its holder with 1.4 mm shims ready for possible use.