Agenda/Minutes of the VIS Meeting on 2018/6/1

2018/6/1 13:30 - 14:40

Participants: Tanioka, Tanaka, Takahashi, Sato, Aso, Hirata, Mark, Enzo, Arai, Shoda, Fujii, Ishizaki

Progress report

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

[Y-front]

Transported the DP parts, the ballast rings, and the hand lifter from X-end.
Transported other items (footholds, hoist tool, etc.) from X-front.
Opened the top chamber.
Assembled the EQ stop for DP. The release sensors and the side stoppers were attached.
Assembled the DP itself. Set the DP on the end plate.
Extended the EQ stop for the BF stage.
Opened the cross tube. Installed the protection net ring.
Installed the EQ stop with the DP into the top chamber.
Opened the cup of BF. Cabled the LVDT, the stepping motor, the picomotor and the PT100.
Pre-assembled the BF dampers.
Closed the cup of BF. Attached the primary coils on the cup.
Measured the weight of BF.
Attached the cone bellows on the bottom of top chamber.
Put the SUS sheet on the floor around the cross tube.

Enzo tested the LVDT driver repaired by Tanaka-san - it was fine.
Fujii-kun and Enzo finished assembling a batch of 4 geophones and took test data.
Hirata-san modified some Promec masses (drilling out the threads on 2 of 4 holes) so we could use two layers of them inside the BF.
Hirata-san installed maraging rod receptacles in the LBB damper rings, and in the bottom of PIs #3 and #1 (for the SF damper rings).
After consulting with various people, Hirata-san installed the second half of the LBB top ring in the chamber, simply omitting the pillar and screw associated with the badly threaded hole.
Hirata-san took delivery of the screws for the LBB blade units, made up 9 blade units and installed 6 of them on PI #3 and #1 (for SR3 and SR2).
Hirata-san made up a set of PI cable clamps and installed them on PI #3 (for SR3).
Hirata-san removed the prototype blades from PI #3 to get ready for testing the final blades.
We located the #355 disk and #356 poles for the next level of the security structure up to the SF and installed the poles.
We installed ballast mass in the BF. After some trial and error we settled on 16 Promec masses (7.1 kg) inside the BF and 5 D1808104-4 and 3 D1808104-5 masses (540 g) on the cap.
Enzo and Fujii-kun did several rounds of TFs on the BF/... section of the suspension and debugged a problem with dewhitening filters not being installed in the OSEMINF filter bank.
Enzo installed damping filters for the IM OSEMs.

SRM

Eleonora, Midooka-kun, and Arai-kun calibrated length sensing oplev(klog21)
Eleonora and Midooka-kun worked on the diagonalization of BS IM. (klog5133)
Confirmed the stepping motor actuation on IP stage via medm using BS.
Maximum coil output during the initial alignment (later half of Dec. 2017) was 30 mA in IMV, 3 mA in IMH, 60 m A in TM.

Mark, Enzo, Hirata-san, Kozu-kun at Kamioka Tue-Fri. (Mon is NAOJ medical checkup.)
--
Cable and test BF cap picos.
Crane in security structure disk at SF level.
Crane in SF and remove cap.
Hook BF and adjust total ballast.
Route cables through SF-BF flying saucer up to bottom of SF.
Adjust BF trim mass.
Readjust payload.
Take TFs.
Characterize final F0 blades.

Mark Enzo, Hirata-san, Kozu-kun at Kamioka Tue-Fri (Mon is compensation day for f2f.)
--
Any unfinished SR3 SF/... stuff.
Add budgeted ballast mass to SF and weigh SF/... section.
Cable, test SF LVDT and FR.
Rebuild F0 #3 for SR3.
Park F0 #1 (for SR2) in top of SR3 assembly frame.
Move F0 #3 behind SR3.

Remote Desktop

On 2018/6/8(Fri)