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| Deletions are marked like this. | Additions are marked like this. |
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| * Need more realistic schedule * Take into account the preparation of SR suspensions * SRM and PRM payloads need to be ordered. |
* Some holes are missing on the bottom of the BF: 4 holes instead of 6 -> less number of the cable cramps * Put multiple cables in one cable cramp. * Check the SF too. |
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| * Fabian will start the preparation from the next week. | * Fabian made an inventory. Most parts are ready. |
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* Prototype testof the EQ stop<<BR>> |
* Ask Miyoki-san to add cable racks * Prototype test of the EQ stop |
VIS Meeting on 2016/5/20
2016/5/20 13:30 -
Room 210
Participants:Sato, Hirata, Ishizaki, Mark, Fabian, Takahashi, Ohishi, Aso, Shoda, Raffaele, Okutomi
Overall Schedule
The current overall schedule chart.
iKAGRA related activities
PR3
- PR3 post-run work status (Shoda)
IP tests in Kamioka
- Status report (Fujii)
- Control test may be performed with the hanging test of BS
- Ask Joris what is his intention and schedule (Raffaele)
- Ask if we can perform the control test remotely (Aso)
bKAGRA preparation
Important Issues
- Suspended bread board
- #Many critical components will be installed on it (baffles, steering mirrors for the green injection etc)
- We have to make sure that the bread board suspension is properly damped
- Takahashi checked Sekiguchi thesis
- Damping effect depends on the ratio of mass and resonant frequency. Estimated effect was 0.45 for the experiments. The number of magnets needed in the same condition is about half.
30 magnets necessary for the gap of 5mm -> need to update the calculation for the double pendulum case (Takahashi)
- Accelerometers for IP
Geophone is too noisy for innertial damping in Kamioka -> argument presented in Sekiguchi PhD thesis
- #TAMA SAS accelerometers for Type-A
- NIKHEF accelerometers for BS
- Joris seems to be interested in continue the test according to Raffaele.
- Need to see if this accelerometer is good enough (seems to have some problems).
- #Which accelerometers for SR ?
- Buy from NIKHEF ? How much is the cost ?
- Get the design from NIKHEF and produce them in Japan (ATC) ?
Conclusions of this week:
- We should first see the result of Fujii-kun's test. Aso will follow up on his experiment in the next week.
- For the question of how bad the geophone is, Shoda will check Sekiguchi thesis and report by email.
- Pre-isolator assembly and tests
- Sato-san will come to Kamioka next week
- What is the plan for SR Type-B
Takahashi and Mark will start the discussion on, where, who, when -> continue.
- Bottom filter local sensor for Type-A
Tell SEO about the wider cross tube -> Wider tube is not possible
Fix EQ stop at the bottom ? -> This is possible
- Takahashi had a discussion with Saito: modify the design of the bottom plate is easier.
- #EQ stop design should take into account of the sensor/actuator mounts.
- #Use the same sensor/actuator as Type-Bp ?
- #Sato-san is responsible for this part.
- Dummy payload design for Type-A
- Okutomi-kun is assigned.
Okutomi will make schematic design. One of the engineers will make drawings. Report more detailed plan by the next week (Takahashi).
Common Issues
- Wide OSEM production (Akutsu)
- For BS test hanging, we need the wider version by mid-to-late June.
Got cost estimates for the small parts. Will order for 20 OSEMs.
Length sensing OpLev
- Discuss in Optics Meeting.
- #In order to test this with the BS test haning, we want to have wide OSEMs as witness sensors on the mirror.
- #Stab-flag and tipped flag are both in quotation. We will order both. The gluing jigs will be the same.
#Who will design and prepare the BS length sensing OpLev ? -> Ask Simon (Aso) -> in progress
- #What shall we do with PR2
PR2 chamber has only one viewport avaibale at 45deg. angle for OpLev
Original idea: Put a reflecting mirror on the bread board and monitor the rotation of the bread board with another OpLev.
- No length sensing
Two OpLevs needed
Another idea: Introduce the light with a fiber into the vacuum chamber to form a one-way 45deg. OpLev for length sensing.
- Length sensing possible
- Affected by the vacuum chamber tilt (if we mount the fiber collimator to the inner frame, the tilt will be less).
- Need to find a place to mount the fiber collimator inside the vacuum chamber
See if we can find any mounting point on the inner frame (Akutsu) by the next next VIS meeting.
Electronics
- What are necessary in the next few weeks ?
- We need to count the number of necessary circuits for Type-A and Type-Bp, so that we can tell AEL the total number necessary for VIS.
Make a list by the end of May (Shoda, Takahashi) -> List
- Presented the list to AEL. Miyakawa-san agreed.
- Need to update the list to include IMMT
- Discuss how many spares to make at the next AEL meeting
- Watch dog system (Tanaka)
- Wants to do tests with the existing PR3 sometime in fall ? Need coordination.
- photo-MOS relay switch resistance fluctuation
Noise requirement for the resistance fluctuation is necessary (Aso)
Tanaka measured the photo-MOS relay resistance fluctuation-> 37mOhm RMS upper limit
- Will make spectrum of the resistance fluctuation.
DC-DC convertor noise check: quiter than a battery ?
#The next step: Make a prototype with slow shutdown mechanism
Type-B
- Past Week Summary
- Fabian did inventory of parts/fasteners for dummy BS, RM, IM and IRM - almost all at Mitaka. A handful (picos, pico drivers) will be brought back from Kamioka.
- Fabian continued work on Mathematica and Matlab models of the BS and control system. He now gets much better agreement after correcting discrepancies between the parameter sets.
- Hirata-san worked on:
- Checking Mirapro assembly frame drawings
- Ordering missing screws and small items (screws for dummy mass, fine pitch M8 for RM)
- Work platforms and clean booth second floor arrangement.
Load gauge adapter and associated parts
- Possible fall-back plans for the rods connecting the security structure to the PI.
- Design for additional IM trim masses (existing design had one mass per corner and no provision for adding/removing).
Mark worked more on E1504235 BS Assembly Procedure (Draft on OneDrive)
Mark designed a guide part to help place the PI accurately onto the security structure.
Discussions
Some holes are missing on the bottom of the BF: 4 holes instead of 6 -> less number of the cable cramps
- Put multiple cables in one cable cramp.
- Check the SF too.
- IM assembly
- Planning to do it in ATC. Use the clean room used for the SF assembly.
- Fabian made an inventory. Most parts are ready.
- Wires
Fabian continued analysis of RM wire thickness versus mode frequency: link, another link,yet another link (From last week: T1605106 /draft)
- Can we make SR wire breakers bigger?
Fukushima-san preparing test: 3/4/2016 + "1 month" = ≈4/1/2016, not ready as of 4/8.-> Takahashi will ask the status.
- Flags, Prisms
- BS dummy optic
Ordered, expected ≈4/22 (T1604811)
- Decided to have it shipped to Mitaka for initial assembly and give it to Tatsumi-san for prisms/flags.
- Mirror box (Tatsumi)
- Tatsumi-san has ordered modifications to mirror box for final flags and prisms.
- An extra structure attached to the EQ stop to prevent tipping over of the BS.
- Will consider if we can make it to the test hanging. But not critical for the test hanging.
- No action since last week.
- Not enough crane height problem (Hirata, Saito)
- No action since last week
- EQ stop screws, extensions and lock nuts (in manufacture - promised for 4/22)
- Ballast masses for payload
Hirata-san created drawings DropBox link
- Drawings were checked by Mark, not yet ordered.
- Lower breadboard stuff
- Breadboard spring bases and associated cable clamps (in manufacture, expected 4/15)
- Breadboard springs (in manufacture)
- Damper ring mods (in manufacture, expected 4/28)
- Nail-head parts: quote from Mirapro received, not urgent, will be combined with assembly frame order.
- BS Assembly Frame Design (Mark, Hirata)
- Hirata-san did new Inventor assembly with Mirapro's initial design plus various improvements including clean bag supports.
- Clean bag
- Ordered - expected 6/8.
- 2D and 3D CAD
- BS 3D Assembly
- 3D CAD for BS assembly frame revised again (seismometers changes to geophones).
- Electronics
- Item list and timetable was given to Miyakawa-san - some corrections received and added to schematic but not yet posted.
- Status on AEL boxes OK according to Miyakawa-san.
- Need to order LVDT oscillator cards from NIKHEF (Takahashi) and have a signal generator and cable in the meantime (Mark).
- Need to get new longer versions of some previously ordered BF-PI and SF-PI cables (Takahashi).
- Need to check previously ordered TM-BF and IM-BF OSEM cables have been flipped (Takahashi).
- Decided to hand-make cables for geophones because previously ordered cables have no conductor on pin 5.
Stepper drive box (requested by Sekiguchi-san T1503385) is being designed, should be ready in time.
- Procedure documents
Mark worked on BS Assembly Procedure E1504235 draft
Type A
Task list (Takahashi)
Clean booth design for 2F https://www.dropbox.com/s/8bi9ij91radmpt5/IXYV160512.pdf?dl=0
- Ask Miyoki-san to add cable racks
- Prototype test of the EQ stop
- Purpose of the test needs to be clarified to decide on where to perform the test.
- The test of prototype long maraging rod was finished
- Will order them with maraging rods for the cryogenic payload early July. The lead time is 2 months.
- Type-B Standard Filters preparation
5 SF measurements were done. http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=5105
- The shell of the 2 filters were too tight. Were able to open but could not close one of them.
- The ones we cannot close the shell, we can use them for the Type-Bp.
- Ship them to Kamioka
- Type-A SF preparation
- Needs to cut more finshing rod blades.
- The next Type-A meeting will be on 5/26.
- #Simultion (Okutomi)
- #Local sensors for BF
Type-Bp modification
- Modification for bKAGRA
- wiki
- Discussing with ATC people for the mechanical modification.
- Got some comments
- Estimating the noise requirements for the BF sensor/actuator
- Full CAD model of the original Type-Bp needs to be created
Site work plan for the next week
Mon:PR3 measurements, IP
- Tue: PR3 measurements, IP
- Wed: Extended Chief Meeting
- Thu: PR3 measurements, IP
- Fri: PR3 vacuum evacuation, IP
Travel Plans
- Travel (Week of 5/16)
- Takahashi: 17-20 (chief meeting and IP)
Shoda:16-20 (PR3)
- Mark:
- Fabian:
Okutomi:15-18 (PR3)
Fujii:17-20 (IP)
- Ishizaki:
- Hirata:
- Ohishi:
- Travel (Week of 5/23):
- Takahashi:
- Shoda: Elba
- Mark:
- Fabian:
- Okutomi: Elba
Fujii:23-27 (Accelerometer, PR3)
- Ishizaki:
- Hirata:
- Ohishi:
Mark is away: July 8-20
Other
Safety:no incident
- #GAS blade inspection by Virgo (Takahashi)
- Shipped the blades. Will get results in 1-2 months.
Next meeting
2016/5/20(Fri) 13:30 -