Ideas for VIS improvement/upgrade

Control

• Inertial control for Type-B
• Hierarchical control of Type-A
• Organize tools for commissioners (auto-measurement, safe.snap, etc...)
• Noise budgeting
• Feedforward using seismometers
• Auto health checking system
• Measurement-based suspension modeling with system identification
• Optimized feedback based on a cost function
• Situation-sensitive filter adaptation with peripheral environmental monitors
• Robust mode for surfing earthquakes without lock loss

Safety

• Status monitor
• Better watchdog

Mechanical Repair

• ETMY GAS filters
• ETMX F2 GAS
• ITMX and ITMY F0 GAS
• ITMY BF Yaw pico
• BS F0 Yaw stepper
• PRM IM magnet polarization
• PR2 TM magnet polarizatio
• Fishing rod repair:
  • SR3 SF: it does not move (klog 8658).
  • SR3 BF: it does not allows us to move the keystone to zero (klog 8658).
  • BS SF: it does not allow us to move the keystone to zero (klog 8645).
  • BS F0: it does not allow us to move the keystone to zero (klog 8645).

Electrical Repair

• Signal generator cards for LVDT drivers.

Mechanical Upgrade

• OSTM suspension
• Jigs for removing the payload part of Type-B/Bp without disassembling everything
• Rotate the cryopayload of Type A for easy access of the mirror (cleaning, repair, etc)
• Optical Lever Covers
• ACCs for inertial damping.

• New design of GAS filters considering 40kg TM (Memo).

  • Add limit swich for vertical fishing rod.
• For Tyep-A, add a damping system for the 2nd-yaw-mode, where BF is at the node.

• Renovate unfixed Dsub connections around IP. (Type-A, EY only, memo )

Electrical Upgrade

• Connect the Release-sensor's signal to the digital system. (Type-A, If necessary.)
• PR3 traverser in-vac cabling
• add another oplev at MN-stage in order to degenerate P and R coupling.