= Agenda/Minutes of the VIS Meeting on 2018/2/2 =

2018/2/2 13:30 - 14:40

Participants: Mark, Takahashi, Sato, Aso, Hirata, Tanaka, Fabian, Shoda, Ishizaki, Suzuki

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

Type-B: ([[TBD|PDF]],[[TBD|MPP]])

 * Type-A: 0.5 week delay expected for BF
 * Type-B: 

=== Type-A (Takahashi) ===
==== Past week report ====

[X-front]
  * Assembled the side stoppers for DP and BF.
  * Assembled the LVDT coils for BF damper. The primary coils were attached on the cup.
  * Measured the weight of BF (105 kg).
  * Put the BF base onto the end plate and hooked the test wire to the receptacle.
  * Tuned the BF with additional compression (load 190.4kg, frequency 0.3Hz).
   * '''Check with CRY if 190kg is OK for CRY payload (Takahashi)'''
  * Checked the range of FR in the BF. The range was larger than the movable limit of keystone.
  * Checked the blades on TFs. There were not any cracks on the surface of the blades.

[Y-end]
  * Release the support jack for the top chamber. The height of chamber was decreased by 2mm.
  * Removed the NIM chassis from the rack.

==== Plan for coming weeks ====
  * Open the top chamber and the cross tube.
  * Install the DP and the BF into the chamber.

=== Type B (Mark) ===
==== Report for week of 1/29 ====
 * We moved the top filter intended for SR2 (#1) into the SR3 cleanbooth. 
 * Unfortunately we noticed one of the blades had many small X-shaped stress fractures on the top surface (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4058|4058]]).
 * We moved the top filter entered for SR3 (#3) into the SRM cleanbooth and inspected the blades. Two had one smallish stress fracture each and one had a huge fracture and looks close to failing  (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4061|4061]]).
 * We referred the BS OL.
 * We removed the BS tank lid and inspected the BS top filter blades. They seemed fine (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=4073|4073]]).
 * Hirata-san received and washed some ferromagnetic disks for IM flags and other small parts.
 * Hirata-san moved the BF with the tilted keystone (#1) out of the cleanbooth in preparation for rebuilding.
 * Hirata-san placed the second order for payload parts, and an order for remachining of nuts for cable clamps on rods.
 * Fabian measured the gain of the ADC system (homework from the Commissioning Workshop).
 * Shoda-san revised the BS real-time model (and Izumi-san fixed a few compile errors and installed it).
 
==== Plan for week of 2/5 ====
 * Enzo on vacation; all others at Kamioka.
 * -
 * Make in-air pico adapter cables.
 * Calibrate LVDT.
 * Test IM picos and BF yaw pico.
 * Test FR.
 * Install ballast mass in BF.
 * Build IRM around IM.

==== Plan for week of 2/13 ====
 * No work Monday (建国記念の日の振替休日)<<BR>>
 * Enzo on vacation
 * Hirata-san at Mitaka Tue, Wed (to receive and wash parts).
 * All others at Kamioka.
 * -
 * Cable/test/adjust IM OSEMs.
 * Do TFs from IM OSEMs to IM OSEMs, OL pitch/yaw.

==== Plan for week of 2/19 ====
 * Lift BF/... section and check total mass and balance.
 * Cable and test BF picos.
 * Add section of SS up to SF ring.
 * Bring in SF.
 * Add Cu segments to SF cap.
 * Hook BF/... section.
 * Route cables up to under SF.
 * Check/adjust total mass of BF/... section. 

==== Vacation Info ====
 * Enzo 1/30-2/19 (at Mitaka 1/29, part of 1/30).
 * Fabian 4/2-4/27 vacation (then gone). 

=== Type-Bp (Shoda) ===
==== Past week report ====
==== Plan for coming weeks ====

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

=== Watchdog system (Tanaka) ===
==== Past week report ====

*Preparation for assembly of mass products. --> Ongoing.

*Adjustment and approval to vendors(Meeting on machine design etc). --> Completed.

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

*Preparation for assembly of mass products.

*Adjustment and approval to vendors(Implementation adjustments and approvals for circuit boards.).


=== Other site works ===
 * Feb 18: Black out of the Mozumi buildings
=== Safety ===
 * Incidents: no incident

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

== Discussion ==
 * Fragile blades
  * All the SR TF blades are bad -> we will replace them
  * BS and ITM TF blades seem to be OK (no crack found)
   * Takahashi will ask G&M the history of those blades (is there any difference between the SR blades and others ?)
  * For ITM TF, we do not have enough number of blades from the beginning. We need at least 3 more blades.
  * We will make the following numbers of blades:
   * SR: 15 (9 necessary)
   * BS: 6 (3 necessary if we replace them)
   * Type-A: 6 (3 necessary)

 * How to safely take out the damaged blades from the TFs ?
  * We need to wear protective gear (Aso will look for them)
  * We will clamp the blade (using C-clamps) to the jig around the large crack to prevent sudden break. Hirata will select suitable C-clamps.
  * Once the blades are moved to the work bench, we will cover everything in a plastic box before releasing the stress.

== Travel Plans ==
 * Travel (Week of 2/5):
  * Takahashi: 7-9
  * Okutomi: 5 - 9
  * Sato: 6-9
  * Ishizaki: 7-9
  * Mark: 5-9
  * Fabian: 5-9
  * Hirata: 5-9
  * Enzo:
  * Shoda:
  * Ohishi:
  * Fujii:
  * Tanaka:
  * Kozu (ICRR): 5-9
  * Arai (ICRR):


 * Travel (Week of 2/12):
  * Takahashi: 13-16
  * Okutomi: 13-16
  * Sato: 13-16
  * Ishizaki: 13-16
  * Mark: 13-16
  * Fabian: 13-16
  * Hirata: 15-16
  * Enzo: 
  * Shoda: 
  * Ohishi: 
  * Fujii:
  * Tanaka:
  * Kozu (ICRR): 13-16
  * Arai (ICRR): 

== Next meeting ==
On 2018/2/9(Fri)