= Agenda/Minutes of the VIS Meeting on 2018/10/19 =

2018/10/19 13:30 - 14:50

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

Participants:Mark, Okutomi, Takahashi, Aso, Ohishi, Enzo, Sato, Hirata, Fabian, Fujii, Lucia

== 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-C: ([[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=9013|XLSX]])

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

[X-front]
  * Corrected the tilt of IP base by jack up/down of the corn bellows.
  * Adjusted the position of IP by the stepping motors.
  * Aligned the TM by the yaw picomoter in the BF.

[X-end]
  * Corrected the tilt of IP base by jack up/down of the corn bellows.
  * It was difficult to adjust the position of IP by the stepping motors due to the tight stopper setting.
  * Vented the EXV chamber and open the top chamber.
  * Released the stopper for IP more.
  * Adjusted the position of IP by hand/stepping motors.
  * Aligned the TM by the yaw picomoter in the BF.
  * Closed the top chamber and started the evacuation.
  * Followed the drift of IP position by the stepping motors during the evacuation.

[Y-front]
  * Investigated the 70Hz peak in the spectrum of IP LVDTs. Changed the modulation frequency from 10,000Hz to 10,003Hz.
  * Designing the yaw stepping motor mechanism. We need to procure 4 more motors.

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

[Y-front]
  * Replacement of the FR parts for BF. (10/22, 23)

[Y-end]
  * Assembly of the geophone pods and installation. (10/24)

=== Type B (Mark) ===
==== Report for week of 10/15 ====
===== SRM =====
 * We received the fourth feedthrough we had been waiting for and installed it on the AF.
 * Fabian added the cables between the FE computer and the ADC/DAC boxes, and we checked that we were getting IO in the real-time model.
 * Fabian and Enzo connected up the Sat Amps.
 * Fabian double-checked the optic pitch, got the IRM nicely aligned to the IM, cabled IM OSEMs V1, V2, V3 and H1, and adjusted those OSEMs in/out to midrange.
 * Hirata-san set the compression on the F0 to 30 mm and measured the height and frequency as a function of load. He then fixed a loose screw on one of the blade tips and repeated the measurement. The frequency was fairly constant at around 0.5, which will do. He did a mass budget and chose a F1 CuBe spring. We may do a tiny bit more compression if the frequency degrades, and/or choose an even stronger spring if the load capacity is not enough.
 * Hirata-san took apart and reassembled one of the LBB blade units, which had a badly seated blade.
 * Hirata-san put cable clamps on the SF and on the PI. We are very short on the PEEK clamp pieces, so he scavenged some from SR2.
 * We added a new LAN hub for SRM, and configured two stepper drivers as SRM_IP and SRM_GAS.
 * Late in the week we received extra Type 3-4 cables (thanks to Sato-san for expediting) and were able to cable IM OSEMs H2 and H3, and the BF LVDT.
 * Enzo made a new batch of feedthrough adapters.
===== SR2 =====
 * We finalized the geophone cabling and reinstalled the geophones.
 * We received the new arc weights, and used some of them to install a basic allotment of 6 38-mm weights on SR3 per the CAD. We then added two extra 19-mm arc weights for tuning and got a good IP frequency of 0.133 Hz.
 * Apart from the F0 yaw stepper issue and the OL, the SR2 is now more-or-less complete and adjusted mechanically, and just needs software work (control loops etc). We will however have to borrow one of the geophones at some point to do a huddle test with the final batch of new geophones (including those for SRM). Terrence can set up the OL in the week of 10/29.
==== Plan for week of 10/22 ====
 * Friday is NAOJ Open Day Prep - no Kamioka work.
 * Mark, Hirata-san and Fabian at Kamioka Mon-Thu.
 * Enzo at Kamioka Tue-Thu.
===== SR2 =====
 * Monitor disassembly of SR2 AF.
 * Do a measurement of how much torque is required on the F0 keystone to move the system in yaw. (This will help Sato-san choose a suitable stepper driver for the new design.)
 * Continue shakedown.
 * Gather parts for the OL (with help from Simon).
===== SRM =====
 * Get optical table from SR2 AF moved to near SR3 and move cables in preparation for geophone test.
 * Scavenge HPCDs from SR2 and SR3 (currently we only have one for SRM) and organize to get LPCDs modified. 
 * Suspend/weigh/balance the BF/... section.
 * Build up the AF and SS to the SF level.
 * Install the SF.
==== Plan for week of 10/29 ====
 * Mark, Enzo, Hirata-san, Fabian and Terrence at Kamioka Mon-Fri.
===== SR2 =====
 * Set up OL.
===== SRM =====
 * Continue assembly.
==== 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/Visitor Info ====
 * Terrence: 10/29-11/2 at Kamioka.

=== Type-Bp (Shoda) ===
==== Past week report ====
 * Vertical DC control for all the GAS filters have been implemented
 * PRM LVDTs have much larger coupling from the actuation signal at high frequencies compared with the situation before the black out

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

=== OMMT & OSTM (Ohishi) ===
==== Past week report ====
 *Delivered mechanical parts were almost assembled.
 *Did cabling from rack to satellite box, and inside chamber.
 *Mirapro adjusted breadboard level in the vacuum chamber.
 *OMC was installed by TITech people. 
==== Plan for coming weeks ====
 *glue magnets and standoff of OMMT1. 
 *cabling (Make flipper, and pico-motor cables)
 *hang OMMT1 mirror from IM.
 *Kaihatsu? or Kaihotsu san will come from Toyama University from Tue to Fri. 
=== VIS electronics (Tanaka) ===
==== Past week report ====
==== Plan for coming weeks ====

=== Other site works ===

=== Safety ===
 * Incidents: no issue

 * Foreseen risks
  * Type-A: No crane work
  * Type-B: Crane work

== Discussion ==
=== Type-A ===
 * Postpone the installation of geophones to ETMY until later half of November

=== Type-B ===
 * We need 4 more long cables
 * The delivery of new cable material will be too late (late November)
 * We will connect shorter cables with soldering
  * Insulation with PEEK heat shrink tubes or Kapton sheets
  * Use vacseal to reinforce the connection   
== Travel Plans ==
 * Travel (Week of 10/22):
  * Takahashi: 22-24
  * Okutomi:
  * Sato: 22-24
  * Lucia: 22-26
  * Fabian:22-26 
  * Mark: 22-25
  * Hirata: 22-25
  * Enzo:23-25
  * Shoda:
  * Ohishi:
  * Fujii: 
  * Tanioka:
  * Tanaka:
  * Kozu (ICRR):
  * Arai (ICRR):

 * Travel (Week of 10/29):
  * Takahashi: 30 - 2  
  * Okutomi:
  * Sato: 
  * Lucia: 29 - 2
  * Fabian: 29 - 2
  * Mark: 29 - 2
  * Hirata: 29 - 2
  * Enzo: 29 - 2
  * Shoda:
  * Ohishi:
  * Fujii: 29 - 2
  * Tanioka:
  * Tanaka:
  * Terrence: 29 - 2
  * Kozu (ICRR):
  * Arai (ICRR):


== Next meeting ==
On 2018/11/2(Fri)