• KAGRA
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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

Every Week

Facilities

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

• Get stuff from ../WishList

2019-03-04

Etc

• Help Fujii-kun with PRx.

All

• Test stepper remote enable system.

• Choose optimum BIO Config board switch settings for all OLs. See D1302081 for what each switch does. Four of them are gain stages (24 dB, 12 dB, 6 dB, 3 dB), and three are filters (all 1 Hz zero, 10 Hz pole). Please clarify the switch numbering and functions (switch "1" = circuit board B0 = group 1, filter A1; position 1 = enable?), make a cheat sheet and put a copy in each rack.

BS

• Offload large IM/IRM yaw to IP or F0 yaw.

SR2

• Redo control filters for new topology.
• Damping time measurements.

SR3

SRM

• Debug OL, especially whitening filter. Note that WF S1808108 has a mysterious note on its JGWDoc page suggesting it may have a fault.
• Set up LEN OL (if/when 3D QPD stage arrives).

Real-Time Model/Guardian

• See KAGRA/Subgroups/VIS/OpsManual/Simulink

• Test Guardians.

Documentation and Operation Manual

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

Minor Tasks

Mechanical

• Put pointy-tipped screw in RM trolley for BS

Electrical

• Update BS Circuit diagram, D1503600

  • Note removal of LED/PD on TM OSEMs.

  • Organize stepper reset system and watchdog BIO.
  • Include information on assignment of channels to feedthrough positions.
  • Reflect gender-changers and non-flipping feedthrough adapters.
  • 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

• Create SUMCON models for full BS and major installation milestones.

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

• Make table of ADC/DAC assignments and check for consistency with D1503600 and k1visbs (Enzo, Mark)
• 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.

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).
• (Continue to) soak the sapphire prisms off the dummy BS for reuse on the SRM metal mass.

SR3

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

SRM

• Install Enomoto-kun's beam target plate (if/when available).
• Find two geophone cables used by Okutomi-san. (I looked in the second floor EXV room but didn't find them - Mark.)
• Find one geophone cable ordered for SRM but missing.
• Rearrange miswired geophone cable.
• Rebuild defective geophone cable.
• Put FC on SRM-W and install it in its holder with 1.4 mm shims ready for possible use.