Agenda/Minutes of the VIS Meeting on 2017/4/21
2017/4/21 13:30 -
Participants: Mark, Ishizaki, Takahashi, Aso, Enzo, Fabian, Shoda, Tanaka, Okutomi, Sato, Hirata, Miyo, Perry, Akutsu
Progress report
- Type-A: On schedule (4 weeks delay from original plan)
- Type-B: 7 week delay
- Type-Bp: On schedule
Type-A (Takahashi)
Past week report
Installation in Y-end:
17th(Mon)
- Cleaned the booth and opened the chamber.
- Unpacked the F1 and moved it into the clean booth.
18th(Tue)
- Assembled the end plate 1.
- Checked behavior of F2. The frequency depends on the stress due to the cap.
19th(Wed)
- Extended the EQ stop to the F1 stage.
- Prepared for the F1 damper.
- Cabling of the F1.
- Put the F1 on the EQ stop.
20th(Thu)
- Replaced two release sensors.
- Cabling between F1 and F2.
Plan for coming weeks
- Setting of the F1.
- Prepare for the pre-isolator.
Type B (Mark)
Past week report
At Kamioka (Mark, Fabian, Enzo, Perry, Hirata-san):
- Plugged in the second pico cable (accidentally shipped to Mitaka and returned) and tested the pico motors with Miyo-kun's MEDM interface. All worked on FAST speed except IM_YAW. Miyo-kun worked on debugging the SLOW and MED speeds.
Realized that the SF/BF/... section doesn't need 6 kg added, it needs 6 kg removed, but none to remove. The 20 kg extra in the BF to match the SF GAS filter makes the whole chain overload the PI GAS filter.
Lifted the SF/BF/... section to check for net weight and balance. Was 307 kg (cf. G&M's measurement of 301 kf in 2012 for the F0). Can be balanced with only 63 g extra.
- Went to build up the LBB blade units but discovered that the holes in the base of the blades are two small (are Ø11 mm; should be Ø12 MM). 3D CAD was correct - error was in the 2D drawing. Shipped the blades away for modification.
- Tested the SF LVDT actuation and worked on debugging it. Still not working.
- Prepared the PI for being lifted, tested the crane adapter, and prepared the top of the assembly frame for receiving the PI.
- Searched for and found the old PI-SF rod. (We went to use the new one but found it doesn't work with the old fittings because it has 8 mm instead of 7 mm heads).
- Did safety improvements after Enzo hit his head on a flange bolt: reversed all the bolts on the ±X sides of the BS and put caution tape on them.
- Worked on understanding/validating/debugging Kokeyama-san's changes to the real-time model for the DIO, and started on TFs to check the output filter compensation is working.
Plan for coming weeks
For more detail, see KAGRA/Subgroups/VIS/TypeB/ToDo.
Week of 4/24 (four-day week):
- Crane in PI.
- Connect SF/BF... section and see if we're indeed overweight and by exactly how much.
- Finish debugging SF LVDT actuation.
Week of 5/1:
- No activity (Golden Week).
What to do with the over weight problem
- If the top filter optimal load is lower than the actual weight of the SF and below:
- We need to reduce the optimal load of SF
- By replacing two of the 6 blades in the SF to the BS BF blades, the optimal load of SF will be reduced by 19kg.
- Currently, we are putting 21kg on the BF to adjust the load on the SF. We will have 2kg to level the BF.
- We will buy new set of jigs for assembling filters in Kamioka.
Type-Bp (Shoda)
Past week report
- IM TF measured
- IM OSEMs are adjusted
- IM TFs are measured
- BF/BFRM stage assembled
- We closed the cap, and cabling was done till the top of the BF.
- Set the top plate and Traverser on the assembly frame and connected to the EQ stop.
- BFRM is suspended from the Traverser interface plate.
Plan for coming weeks
- Optical bench installation test
- Set SF and hang BF (optional)
Discussion
- The resonant frequencies of the IM in pitch and vertical are close. So a lot of cross-coupling at the resonant frequencies is observed.
- We should adjust the actuation balance and see if the damping loops can be closed stably or not.
IMMT (Ohishi)
Past week report
Plan for coming weeks
Watchdog system (Tanaka)
Past week report
Start operation test of system.-->Interrupution.
- Resolved.
When changing theOS(Win7 to Win10) and building the setup environment of S/W,problem occurs that the debug tool can't be used.-->I confirmed that this problem will be solved by rewriting a part of the registry.
A problem occcurred thatcould't be compiled even though the version of the compiler was the same.-->I solved the problem by patching the required include files.
- Resolved.
Plan for coming weeks
Start operation test of system.-->Ongoing.
Safety
- Incidents: dropped some screws from the 2F
- How to protect our heads in the clean booth ?
clean room helmet https://www.monotaro.com/g/00250428/ - not usable for people with small head.
- Put caution tapes to warn people
Cover the sharp objects with soft material -> possible for some dangerous objects
Better lighting -> this is very important
- Foreseen risks
- Type-A: Crane works
- Type-B: Crane works
- Type-Bp: Crane works
Discussion
- Cable management
- Sato-san will maintain the in-vac cable list
- Tell Sato-san when you used cables.
- VIS purchase
- Tell Aso and Takahashi when you purchased something for VIS
Travel Plans
- Travel (Week of 4/24):
- Takahashi: 25-28
- Shoda: 24-28
- Mark: 24-27
- Fabian: 24-26
- Okutomi: 24-28
- Fujii:
- Ishizaki: 24-28
- Hirata: 24-27
- Sato: 24-28
- Enzo: 24-27
- Ohishi:
- Tanaka:
- Perry: 24-28
- Sekiguchi(Hosei): 24-28
- Hirayama(Hosei): 24-28
- Travel (Week of 5/8):
- Takahashi: 8-12
- Shoda: GWADW
- Mark: 9-12
- Fabian: 9-12
- Okutomi:
- Fujii:
- Ishizaki: 8-12
- Hirata: 9-12
- Sato: 8-12
- Enzo: 9-12
- Ohishi:
- Tanaka:
- Sekiguchi(Hosei): 8-12
- Hirayama(Hosei): 8-12
Next meeting
On 2017/4/28(Fri)