[ ] LVDT sensor correction for IP and F0 (Fabian, Terrence) -> ???
[ ] L-P, L-Y decoupling for BS and SRM (Shoda) -> ???
[ ] Change the coil drivers for MN to HP (Yamada, Aso) -> #10
Adjust the gains of the damping loops (Yamada, Okutomi, Ushiba)
Recalibrate the optic align (Yamada)
[ ] Check if LVDT noise is limited by ADC or not (Shoda) -> ???
Install whitening filters if necessary (Okutomi, Fabian)
[ ] Implement LVDT sensor correction for the BF stage (Fujii, Lucia) -> ???
[ ] Type-Bp DC control set point has opposite polarity from the other suspension types: modify the real time model (Shoda) -> ???
Near term tasks
[ ] Speed up the state transition of Type-B guardian (Terrence) -> ???
[ ] Investigate the 238Hz peak in the GAS filters of ITMY (klog) (Lucia) -> ???
[ ] Implement the serial hierarchical control similar to Type-A (klog) to Type-B and Bp (Terrence, Shoda) -> ???
[ ] Estimate the length RMS of the Type-A suspensions when the lock acquisition is reasonably easy, from the mass feedback signal (Nakano, Enomoto) -> ???
This will be used as the target for Type-A damping on stormy days
[ ] Implement calm down and lock acquisition damping states for Type-B (Fabian) -> ???
GAS filters of the F1, F2, F3 of ETMY are stuck. We need to extract the entire suspension chain and repair those GAS filters one by one.
[ ] ETMX F2 GAS bi-stability
ETMX F2 GAS is in a bi-stable state. We need extract most of the chain and de-compress the GAS blades.
[ ] ITM F0 GAS filter
Both ITM F0 GAS filters are intentionally fixed, because the load capacity is too small. We will replace three out of six blades with the stronger ones (originally from G&M).
[ ] ITM Geophone installation
Since the ACCs on the ITMs are either not working fine or not easy to use, we may want to replace them with Geophones
[ ] ITM Geophone assembly
Assemble geophones into pods and test them
[ ] Limit switches for FR stepper motors
There is no limit detection switch for the stepper motors of the vertical and Yaw FR on the PI. We will modify the design and install them when possible.
[ ] Design and produce limit swtich mounts for vertical and Yaw FR
No description
[ ] Develop better ACCs
Takahashi-san is developping a better ACC using a shadow sensor. Some improvement of the sensor noise is expected. The driving circuit will be much simpler and robust. The feedback control can be done with KAGRA digital system. Tuning of the mechanical resonant frequency will also improve the sensitivity.
[ ] BS Yaw stepper motor installation
BF Yaw actuator is not remotely controllable now. We need to install a proper coupling and a stepper motor.
[ ] BS Yaw thrust bearing replacement
The BF F0 thrust bearing is a ceramic coated one. Under heavy load, the coating may fracture and increase friction.
[ ] In-vac D-Sub connectors around the ETMY IP are not properly fixed.
These connectors need to be fixed.
[ ] There is a damaged PTFE cable in ETMY.
We need to replace this cable
[ ] PRM IM magnet polarization
The magnet polarization is wrong.
[ ] PR2 TM magnet polarization
The magnet polarization is wrong.
[ ] PR3 traversor in-vac cable is not connected
We need to connect the cable.
[ ] Install signal generator cards for LVDT drivers
We have the cards. We just need to install them.
[ ] Design and produce mirror replacement jigs for Type-B/Bp
The mirrors of Type-B/Bp suspensions cannot be replaced without almost completely disassebling the suspension. We want to make jigs to allow us to replace the mirror without disassebling the entire suspension.
[ ] Replace PR2 with a polarization selective one
We may want to change the PR2 mirror with a high transmissivity for P-polarization to mitigate the bireflingence issue.
[ ] Install better OpLev covers
No description.
[ ] Better damping mechanism for the 2nd Yaw mode of Type-A
This Yaw mode cannot be damped effectively now because the BF is near the node of the mode.
MiyoKouseki
commented
4 years ago
VIS commisioning task list
This document is created by Aso-san in 2019 Aug 26th.
Urgent Tasks
Near term tasks
Longer term tasks
Finished tasks
VIS Task List for post-O3