Agenda/Minutes of the VIS Meeting on 2018/6/22
2018/6/22 13:30 -
Participants:
Progress report
Schedule Chart
Type-A : (PDF/MPP)
Type-B: (PDF/MPP)
Type-A (Takahashi)
Past week report
[Y-front]
- Calibrated the LVDT. The position of the secondary coil was shifted down by 4mm.
- Closed the cup of F3. Suspended the F3 by the crane with the filter chain.
- Tuned the F3 again. The tuned frequency was 0.24Hz.
- Cabled around the F3. Checked cable connection. Two disconnections were found and repaired.
- Fixed the additional weight on the BF.
- Swapped the primary coils to the dummy weight on the BF.
- Lifted down the EQ stop. The end plate for F3 was sit on the frame lock.
- Started the assembly of the end plate for F2.
- Embedded the FR in the F2.
[X-front]
- Embedded the magic wands to the TF. The support point was set closing to the keystone and the counter weight was set in the outer side to obtain large torque.
- The height of keystone was 20mm with a compression of 22mm. The frequency was still aroud 1Hz.
- Transported the hand lifters to the cross tube area.
Plan for coming weeks
- Setting of the F2 stage in Y-front.
- Dismount of the DP in X-front.
- Wiring between the cryo-payload and the BF in X-front.
Type B (Mark)
Report for week of 6/18
- Eleonora was working on BS IM diagonalization.
- Mark checked the health of the suspensions after an earthquake on Monday morning. The BS watchdog tripped and there was a few µrad change in the pointing, but otherwise it was fine. SR3 and SR2 were also fine.
- Mark, Enzo and Terrence finalized the trim mass on the BF to set the SF keystone height and BF pitch/roll.
- They weighed the SF/... section. With no internal trim mass in the SF but with the flying saucer and rod, but with 2 Promec masses for rough balance, it was 255.4 kg, so allowing 1 kg for cables and fine trim mass, we would like a PI load capacity of 256.4 kg.
- Enzo and Terrence cabled and tested the SF fishing rod, and reversed the connections on the SF LVDT actuation to bring it to standard polarity.
- Mark and Enzo made many improvements to the Type B MEDM screens.
- Enzo and Mark measured the BF and SF bounce frequencies (with the other keystone locked).
- Enzo replaced a HPCD that seemed to have failed during the bounce test (but had just had a watchdog trip), and then replaced the replacement, which really did fail. It turns out we need to avoid applying more than about 25000 counts of GAS actuation.
- Enzo offloaded the BF LVDT actuator with the BF FR to remove the need for a 10000 ct offset.
- Hirata-san and Kozu-kun struggled to tune the top filter for SR3 - see klogs 5310, 5324, 5337, xxxx. At first the results were somewhat unrepeatable, with high frequency and low load capacity. This was improved by using a torque wrench (set to 50 N.m) to tighten the blade base clamp screws, retightening the blade tip screws (which had worked loose) and tightening the collar on the end of the shaft of the magic wand. Eventually we decided on a compression of 30 mm, which should give a frequency of around 0.5 Hz if we remove one Cu damper segment from the SF. Hirata-san applied the 30 mm compression but we skipped another round of testing with the dummy load and will go straight to hanging the SF/... section on the assembly frame.
- We wrapped PI #1 (for SR2) and craned it from behind SR3 to behind SRM. We can now wrap PI #3 (for SR3) and crane it straight to the assembly frame.
Plan for week of 6/25
- Mark, Enzo, Hirata-san, Terrence at Kamioka Mon-Fri.
- Kozu-kun at Kamioka except Thu.
- --
- Shutdown Type B controls (as far as possible) in preparation for risk of accidental power outage during electrical work on 6/26.
- Prepare SF damper magnet ring and rods.
- Install PI #3 in SR3 AF.
- Suspend SF/... section.
- Lots of cable routing and testing.
- Move PI #1 (for SR2) over SRM tank to work area, install blades and tune.
Plan for week of 7/2
- Mark, Hirata-san, Terrence at Kamioka Mon-Fri.
- Enzo at Kamioka Mon-Wed.
- Kozu-kun at Kamioka except Wed.
- --
- Lock suspension.
- Remove tank lid and raise LBB damper rings.
- Crane suspension into tank.
To-Do Lists, Schedule
Vacation Info
- Kozu-kun: 7/4 Tokyo.
- Enzo: 7/5-6 NAOJ Party, Mitaka.
- Terrence: 8/24-26 f2f, then returns to Hong Kong.
- Enzo: 9/14 JPS, 9/15 through 10/18 vacation in Chile.
Type-Bp (Shoda)
Past week report
Decay time measurement on PR3 is done. fig
Plan for coming weeks
OMMT & OSTM (Ohishi)
Past week report
- Ordered some mechanical parts.
- Making a list of OMMT mechanical parts.
Plan for coming weeks
- Will order OMMT mechanical parts.
- Prepare glueing jig.
LVDT Driver (Tanaka)
Past week report
Plan for coming weeks
Other site works
- 6/26: 9:00 - 12:00
- Relocation of a power line pole (telephone pole) outside of the tunnel
- A small possibility of accidental power outage
- Shutdown all the VIS control in this period.
Safety
- Incidents:
- Foreseen risks
- Type-A:
- Type-B:
- Type-Bp:
Discussion
- Relocation of SR assembly frame
- July 12(Thu) - 13(Fri)
- IP swap
- July 17 - 20
- 17: Separate IP and TF in the OMC area
- 18: Transport IPs from/to 2F
- 19: Assemble IP and TF for SRM (OMC area)
- 20: Assemble IP and TF for ITMY (2F)
- Main work is done by Sato-san with help from Type-B team
- Binary I/O Converter Chassis
- Share the box between WDS and Stepper motor driver box
- (PRM, PR3): 1
- (PR2, BS): 1
- (SR2): 1
- (SR3, SRM): 1
- ETMX: 1
- ETMY: 1
- ITMX: 1
- ITMY: 1
- Total: 8
Travel Plans
- Travel (Week of 6/25):
- Takahashi:
- Okutomi:
- Sato:
- Ishizaki:
- Mark:
- Hirata:
- Enzo:
- Shoda:
- Ohishi:
- Fujii:
- Tanioka:
- Tanaka:
- Kozu (ICRR):
- Arai (ICRR):
- Terrence:
- Travel (Week of 7/2):
- Takahashi:
- Okutomi:
- Sato:
- Ishizaki:
- Mark:
- Hirata:
- Enzo:
- Shoda:
- Ohishi:
- Fujii:
- Tanioka:
- Tanaka:
- Kozu (ICRR):
- Arai (ICRR):
- Terrence:
Next meeting
On 2018/6/29(Fri)