= Agenda/Minutes of the VIS Meeting on 2018/6/15 =

2018/6/15 13:30 - 

[[https://zoom.us/j/203743987|Zoom Meeting]]

Participants: Takahashi, Sato, Barton, Tapia, Hirata, Kozu, Terrence, Ohishi, Tanioka, Tanaka, Fujii, Okutomi, Shoda, Ishizaki, Tanak(ICRR)

== Progress report ==
=== Schedule Chart ===
Type-A  : ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7320|PDF/MPP]])

Type-B: ([[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|PDF/MPP]])

=== Type-A (Takahashi) ===
==== Past week report ====
   
[Y-front]
  * Mounted the BF onto the EQ stop. The DP was suspended from the BF.
  * Tuned the BF.  Compressed the all five blades. The tuned frequency was 0.24Hz at 198kg.
  * Modified the FR for BF. The fixing point of blade was changed. The FR can cover the full range of keystone.
  * Calibrated the LVDT for BF.
  * Made the short cables for BF damper.
  * Assembled the end plate for F3.
  * Extended the EQ stop to the F3 stage. Attached the support plate for the BF damper.
  * Assembled the FR for F3 with the new blades.
  * Assembled the connector plates for F3. Attached them to the cup.
  * Cabled for the LVDT-Actuator and the stepping motor for F3.
  * Measured the weight of F3. It was 82.9kg.
  * Mounted the F3 onto the EQ stop. The BF was suspended from the F3. 
  * Cabled between the BF and the F3.
  * Tuned the F3. The tuned frequency was 0.31Hz with the additional load of 6kg.
  * Checked the range of FR for BF. The FR can cover the full range of keystone.

[X-front]
  * Set up the analog drivers in the rack.
  * Checked the dimension of distance between the beam axis and the cross tube.

==== Plan for coming weeks ====
  * Calibrate the LVDT for F3.
  * Go to the F2 stage.
  * Tune the TF in X-front.

=== Type B (Mark) ===
==== Report for week of 6/11 ====
 * Mark fixed some channels displaying white on the BS MEDM screens due to issues from splitting the model.
 * Enzo redid the SR3 BIO connections to match the now-working BS setup. He also fixed PR2, which had a similar problem.
 * Enzo replaced LPCDs with HPCDs in the SR3.
 * Hirata-san installed the cable clamps and Cu segments on the SF cap.
 * Hirata-san and Kozu-kun continued tuning the filter in PI #3. Unfortunately it seems to be rather weaker than expected, and we have not found a compression setting that gives a good frequency. We may have to use tricks like reducing the number of Cu segments on the SF (or using Al ones) to save weight.
 * Mark, Enzo and Terrence suspended the BF/... section from the SF, routed all the cables from the BF/... stages up around the BF, via the SF-BF margin rod to the bottom of the SF, and got the hanging section aligned for TFs. 
 * Enzo cabled and tested the SF LVDT (but not yet the SF FR).
 * Mark and Enzo released an update to the BS Circuit Diagram D1503600-v15 with corrections to the BIO and other sections.

==== Plan for week of 6/18 ====
 * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.
 * --
 * Receive second and third sets of LBB damper rings.
 * Take TFs.
 * Cable, test SF LVDT and FR.
 * Add calculated ballast to SF.
 * Finish tuning F0 #3 for SR3.
 * Park F0 #1 (for SR2) in top of SR3 assembly frame.
 * Move F0 #3 behind SR3.
 * Move F0 #1 to "factory" area (in front of SRM) and start rebuild.
 * Install PI.
 * Suspend SF/... section.
 * Lots of cabling.

==== Plan for week of 6/25 ====
 * Mark, Enzo, Hirata-san, Kozu-kun, Terrence at Kamioka Mon-Fri.

==== To-Do Lists, Schedule ====
 * [[KAGRA/Subgroups/VIS/TypeB/ToDoBS]]
 * [[KAGRA/Subgroups/VIS/TypeB/ToDoSR]]
 * [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7779|JGW-L1807779 Type B Schedule (SR)]]

==== Vacation Info ====

=== Type-Bp (Shoda) ===
==== Past week report ====
 * Worked on Oplev diagonalization for PR2 and PR3.
 * Coil balance of PR2 optic was adjusted
 * PR3 IM and BF sensor matrices were also diagonalized.
 * Working on decay time (w/ damping) measurement on PR3.
==== Plan for coming weeks ====

=== OMMT & OSTM (Ohishi) ===
==== Past week report ====

 * Thanks to Tanioka-san and Nagano-san (NICT), we have finished parts replacement of IMMT1.
 * We have replaced stainless screws in the intermediate mass with non-magnetic screws.
 * Measured transfer functions of length, pitch, and yaw and found no problem.

==== Plan for coming weeks ====

 * Order some parts of OMMT.

=== LVDT Driver (Tanaka) ===
==== Past week report ====
==== Plan for coming weeks ====

=== Other site works ===
  * Power line replacement is planed on 26th June.

=== Safety ===
 * Incidents:

 * Foreseen risks
  * Type-A: Crane work.
  * Type-B: Crane work.
  * Type-Bp:

== Discussion ==
  * Commissioning of X-arm in autum.

The commissioning team is requiring the lift up of both ITMX and ETMX by ~ 10 mm. 
It is difficult to lift up the ETMX by the FR more than several mm due to the bistable problem in the F2.

  * Tuning of TF for SR3.

Optimal point lower than 0.3Hz was not found in the compression of 18~30mm. The lowest frequency was 0.4Hz at 245kg. Try to find a point higher than 0.5Hz at the load larger than 255kg again.

== Travel Plans ==
 * Travel (Week of 6/18):
  * Takahashi: 18-22
  * Okutomi: 18-22
  * Sato: 18-22
  * Ishizaki:
  * Mark: 18-22
  * Hirata: 18-22
  * Enzo: 18-22
  * Shoda:
  * Ohishi:
  * Fujii:
  * Tanioka:
  * Tanaka:
  * Kozu (ICRR): 18-22
  * Arai (ICRR):
  * Terrence: 18-22


 * Travel (Week of 6/25):
  * Takahashi: 25-29
  * Okutomi: 
  * Sato: 25-29
  * Ishizaki: 
  * Mark: 25-29
  * Hirata: 25-29
  * Enzo: 25-29
  * Shoda: 
  * Ohishi: 
  * Fujii: 25-29
  * Tanioka:
  * Tanaka:
  * Kozu (ICRR): 25-29 
  * Arai (ICRR): 
  * Terrence: 25-29

== Next meeting ==
On 2018/6/22(Fri)