Agenda/Minutes of the VIS Meeting on 2020/4/3
2020/4/3 14:00 - 15:30
Participants: Takahashi, Hirata, Sato, Ishizaki, Tanaka, Fabian, Aso, Okutomi, Lucia
Progress report
Type-A
Past week report
- Analysis of the tie-rods for corrugated tube.
Revising the Type-A installation procedure.
ITMY IP coil-magnet actuation got saturated (klog 13922). Fabian (klog 13923) and Lucia (12932) moved the IP with horizontal fishing rods
- Designing the LVDT coils for the ACCs.
Plan for coming weeks
Type B
Past week report
By comparing pictures and the 3D-CAD Hirata-san realized the BS large frame is missing some beams (BS_frame.png). Saito-san remembered Mirapro was not able to put them in place because of a conflict with the clean booth pillars. He has already requested Mirapro to redesign the beams. Let's hope to install them before O4.
On Sunday we did hammering test on SR2 chamber and on the duct between SR2 and SR3. Apparently the IFO lock endured the hammering test but lost lock when we walked in front of the oplev. Looking more carefully to the data is required in order to identify the trigger of the event. (See klog entry 13884.)
The channel K1:VIS-SR2_TM_OPLEV_LEN_YAW_OUTPUT went from -10 ndu to -74 ndu, which is out of linear range (-50 ndu to 50 ndu is the linear range).
- TM-Y control actuation saturated.
- Upon request from Yokozawa-san I didn't move the QPD because he wanted the commissioners to do it in order to recover the main IFO at the same time.
Lack of communication on my part created a problem for commisioners (klog entry 13891). Later Yokozawa-san and Nakano-kun moved the QPD and changed the TM-Y filter.
- It didn't seem to be necessary for the IFO but it would be good to check oplev diagonalization again if there's a chance. The oplev seems to be delicate.
- I finished writing the oplev digonalization procedure for the Type-B suspensions.
Type-B: see oplev page in the wiki.
Type-A: see klog entry 10786. (Just a remainder.)
- I offloaded coil-magnet actuators onto fishing rods or IM picomotors.
BS IP: F0 and F1 fishing rods are already at their limit (klog entry 13927).
SR3 IP (klog entry 13928).
SR2 F0, F1 and IM: those fishing rods don't seem to have any problem (klog entry 13930, 13935).
Fishing rod information can be written in the VIS Fishing Rod wiki page. (Just a remainder.)
Plan for coming weeks
Type-Bp
Past week report
Plan for coming weeks
Type-C
Past week report
Plan for coming weeks
VIS electronics
Past week report
- Shaw the design of additional filters with the simulation. It has not been optimized yet.
- It is difficult to combine two functions (additional filter and pin exchanger) because of the different location.
Plan for coming weeks
- Check how small board is available.
Safety
Discussion
- Plan for the long OR brake
- Update without opening the chambers.
- Signal generator cards for the LVDT driver.
- Release sensor monitor.
- Additional filters for the LVDT combiner.
- New Oplev covers.
- Temperature control.
- New control scheme.
- Update without opening the chambers.
Travel Plans
- Travel (Week of 4/6):
- Takahashi:
- Sato:
- Hirata:
- Shoda:
- Tanaka:
- Travel (Week of 4/13):
- Takahashi:
- Sato:
- Hirata:
- Shoda:
- Tanaka:
Next meeting
On 2020/4/10(Fri)