= Agenda/Minutes of the VIS Meeting on 2018/4/20 =

2018/4/20 13:30 - 15:20

Participants: Mark, Shoda, Takahashi, Sato, Aso, Okutomi, Ishizaki, Tanioka, Eleonora, Enzo, Fujii, Hirata, Akutsu, Tanaka

== 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 ====

[X-front]
  * Bent and formed six blades to mount on the TF base.
  * Mounted the blades on the TF base.
  * Put the damper ring with magnets on the F1.
  * Mounted the PI on the bridge frame with the maraging wire.
  * Suspended the filter chain from the TF. Needed load was about 700kg for the TF in spite of target load of 580kg.
  * Removed one blade and rearranged two blade. The TF could work without additional load.
  * Suspended the damper ring from the TF base. One hook screw galled.
  * Cabled between the F1 and the upper small hexagon.
  * Inserted the wire clamp.
  * Dismounted the PI and bridge frame.
  * Checked the cable connections.
  * Lifted down the F1 into the corrugate tube. The top ring sit on the frame lock.
  * Installed the PI into the top chamber.

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

[X-front]
  * Cable to the feedthroughs.
  * Set the ACCs.
  * Calibrate the LVDTs for the BF damper and the IP.

=== Type B (Mark) ===
==== Report for week of 4/9 ====
 * We packed away the SRM SF and BF.
 * After several failed attempts with one secondary prism, Mark finished the SR3 prism/magnet gluing.
 * Tanioka-kun built two IRMs (less OSEMs).
 * Enzo built an RM.
 * Kozu-kun and Enzo calibrated one set of 6 IM OSEMs for SR3. (6 OSEMs for SRM remain to be done.)
 * Hirata-san aligned the assembly frame, installed the interface bars and IM ring, and installed the IM. 
 * Eleonora and Izumi-san revisited the BS length to tilt coupling, which had degraded, and got it working again.

==== Plan for week of 4/23 ====
 * Shoda-san at Mitaka.
 * Hirata-san at Kamioka Mon-Wed, then Mitaka.
 * Kozu-kun at Kamioka Wed-Fri (but may be working with PEM on Fri).
 * Others (Mark, Enzo, Tanioka-kun) at Kamioka full week
 * --
 * Continue SR3 Hang
  * Hang optic.
  * Hang RM.
  * Cable RM OSEMs.

==== Plan for week of 4/30 ====
 * Shoda-san at Mitaka.
 * Mark, Enzo at Kamioka Mon-Wed or TBD.
 * Others having fun doing Golden Week stuff.
 * --
 * Observe KAGRA Phase 1 operations, assist if problems arise.
 * Do BF TFs.
 * Continue SR3 hang.

==== To-Do Lists, Schedule ====
 * [[KAGRA/Subgroups/VIS/TypeB/March2018]]
 * [[KAGRA/Subgroups/VIS/TypeB/April2018]]
 * [[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-v1 Type B Schedule (SR)]]

==== Vacation Info ====
 * Fabian vacation, 3/26-4/27 (then gone). 
=== Type-Bp (Shoda) ===
==== Past week report ====
==== Plan for coming weeks ====

=== OMMT & OSTM (Ohishi) ===
==== Past week report ====
==== Plan for coming weeks ====

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

=== Other site works ===

=== Safety ===
 * Incidents: no incident

 * Foreseen risks
  * Type-A: 
  * Type-B:
  * Type-Bp:

== Discussion ==
=== Composite SRM design (Shoda) ===
 * After some discussions, a new idea of gluing the HR surface to a PEEK ring emerged.
 * Shoda-san will elaborate on the idea and report to the relevant people.

=== ETMY tower repair (Takahashi, Okutomi) ===
 * According to Okutomi-kun's TF measurements, even the F3 stage may be stuck.
 * We should be able to release the F3 GAS by adjusting the mass on the BF from the cross-tube.
 * We will try this before O3.
 * Takahashi-san will make a schedule for the ETMY repair works by the next VIS meeting.

=== Phase 1 Operation Reschedule ===
 * [[https://www.dropbox.com/s/u685czkj8gddd52/Chief180402%E3%80%80Phase1%20after%20experiments.pdf?dl=0|New schedule]] 
 * Mark, Enzo, Okutomi, Tanioka, Kozu will join the operation.
 * Shoda-san will join remotely through Skype or something (communication method will be announced by Mark)

=== LVDT drivers ===
 * [[http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/VIS/OpsManual/LVDT#stocktake|Staocktake]]
 * Buy 10 sets
 * Check the broken boards in Mitaka
 * Enzo will bring the broken LVDT box into the site again to check if the remaining channels are alive or not.

=== OSEM rebuild ===
 * Two SR OSEMs have low open voltage
 * We will replace the LED and PDs on them.
 * Shoda-san will send spare parts from Mitaka to Kamioka.

== Travel Plans ==
 * Travel (Week of 4/23):
  * Takahashi: 23 -27
  * Okutomi: 23 - 
  * Sato: 24 -27
  * Ishizaki:
  * Mark: 23 -27
  * Hirata: 23 -25
  * Enzo: 23 -27
  * Shoda:
  * Ohishi:
  * Fujii: 23 -27
  * Tanioka: 23 -
  * Tanaka:
  * Kozu (ICRR): 25 -27
  * Arai (ICRR):


 * Travel (Week of 4/30):
  * Takahashi: 
  * Okutomi: - 5/3
  * Sato: 
  * Ishizaki: 
  * Mark: 4/31 - 5/2
  * Hirata: 
  * Enzo: 4/31 - 5/2
  * Shoda: 
  * Ohishi: 
  * Fujii:
  * Tanioka: - 5/6
  * Tanaka:
  * Kozu (ICRR): 4/30 - 5/1
  * Arai (ICRR): 

== Next meeting ==
On 2018/4/27(Fri)