• KAGRA
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• VIS
• TypeB
• ToDo

VIS Type B To-Do List

Archived items are at ../ToDoOld.

Commisioning

Noise budget

• Inject bandwidth limited noise into the BS payload degrees of freedom in order to identify peaks in DARM. There's a list of resonance frequencies in the control room.
• Measure transfer functions from BS payload to DARM and calculate noise budget. Yamada-kun has already measured some and, as far as I rememeber from the commissionig meeting on Tuesday, Shoda-san has been assigned to measure more after the engineering run.

Real-time model

• Install BS real-time model. Changes are one additional filter output monitor for the bandpass filters (for the OBSERVATION state) and the path for ASC Terrences's method for control.
• Compile and install SR's real-time models. Similar modifications as for the BS.
• Medm screens have not been modified for the implemetation of Terrence's method.
• Add DAQ channels to the tower part real-time model for the output of the control filters, especially for the IP.
• Add a monitor for the total amount actuation of the IP coild driver (damp+DC) and add it as a DAQ channel.

Guardian

• Edit Guardian in order to speed up the engaging and disegaging of the control loop in the different stages. In TYPEB.py file comment out some calls to waitForRamp function:

  • In beginControlSequence, lines 159, 160, 162, 163.

  • In disengageControlSequence, lines 218, 219, 224, 225.

  After the change Guardian still has to be tested.

• Apparently when the payload trips Guardian doesn't turn the IM optic align block gain back to 1 after recovery. (Reported by Sheila for the BS in klog 12110).

Medm screens

• The IM-H coil drivers with disabled hardware watchdog produce a false trip signal. From the medm screens remove the hardware watchdog indicator for IM-H. This is common for all Type B suspensions. The ideal solution would be to disable the hardware warning signal system instead but there's no time for that now.

• The BS TM coil driver with disabled hardware watchdog produces a false trip signal. This is harder to solve because only BS is affected by this.

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

• Get parts for F0 yaw adjuster - ASAP.

• 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 (Next Vent, or O4)

BS

• Tune BS LBB (adjust table height, damper height) - do as part of Mid-Sized Baffle installation.
• Tune IP to slightly lower frequency (better than current 0.08 Hz, but not as risky as original 0.04 Hz). Experiment with different amounts of mass over each IP leg to reduce L/T/Y cross coupling. Do at same time as Mid-Sized Baffle installation.
• Replace BS F0 yaw adjuster - Do at same time as Mid-Sized Baffle installation, if parts are available.
• Replace BS F0 thrust bearing - BIG JOB - NOT WORTH IT.
• 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).