= Agenda/Minutes of the VIS Meeting on 2019/8/9 =
2019/8/9 14:00 -

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

Participants:

== Progress report ==
=== Type-A ===
==== Past week report ====
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/!\ '''Edit conflict - other version:'''

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/!\ '''Edit conflict - your version:'''

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===== common issue =====
* RT model modification by K. Okutomi * Still seinsmometer signal is not delivered to the ITMY-real time model.

===== ITMY =====
 * health check for the tower part by Lucia
  * F2-GAS TF looked weird. [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9790|9790]]
 * health check for the payload part
  * not yet done.
 * Guardian for ITMY was unified.
  * The failure of MN_DCCTRL seemed to be solved by the commissioners
 * ITMY damping work is (kind of) started.

===== ETMY =====
 * Inertial damping performance check
  * LVDT control vs. inertial control
   * Closing both L and T loops caused an oscillation at ___ Hz.
    * => spectra?
    * => Due to cradle effect?

===== ETMX =====
 * A test of sensor correction and feed-forwarding is now ongoing. 

===== ITMX =====
 * It seemed that the TML-oplev noise level issue did not due to the light source. Due to air-shielding? 

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==== Plan for coming weeks ====
=== Type B ===
==== Report for the week 05-08-2019 ====
 * __After Shoda-san's report (entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9797|9797]]) I checked the condition of the filters in FLOAT state. __
  * __After a few tests I realized the whitening chassis didn't have a whitening filter board. See entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9844|9844]]. __
  * __I replaced the chassis with an appropriate one. See entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9876|9876]]. __
 * __I  checked the configuration of the hardware whitening filters by checking  the 32 bit dip switch boards for each supension. See entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9823|9823]] and [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9876|9876]]. __
  * __The switch configuration is the same for SRM and SR2. __
  * __For BS and SR3 the  configurations are different. __
  * __Additionally, the configuration of the  two boards used for the BS oplev are different from each other. __
  * __This situation should be reviewed. __
  * __Type  Bp and Type A don't seem to be using software anti-whitening filters  for oplevs. I haven't checked their hardwate whitening filters'  configuration though. __
 * __At the begining of the week I continued noise hunting in SR3. See entry [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9807|9807]]. The goal was to identify the limiting elements for the control system in ALIGNED state. See entries __
  * __The motion of the '''IP-L''' induces motion in '''TM-P''' and '''TM-L''' in the frequency band '''from 0.135 Hz to 0.4 Hz'''. This should be fixed at the IP. There's no inertial damping yet. __
  * __The motion of the '''IM-L''' induces motion in '''TM-P''' nd '''TM-L''' in the frequency band from '''0.3 Hz to 0.8 Hz'''. Likely, this should be fixed with IML2TMP and IML2TML control filters. __
  * __The motion of the '''IM-P''' induces motion in '''TM-P''' and '''TM-L''' in the frequency band from '''0.135 Hz to 1 Hz'''. The motion in the band from '''0.135 to 0.4 Hz is likely ground motion coming from the IP''', however, the motion from 0.4 Hz to 1 Hz should be fixed with IMP2TML and IMP2TMP control filters. __
  * __The motion in '''IM-Y''' induces motion '''TM-Y''' between '''1 Hz and 2.3 Hz'''. This should be fixed with IMY2TMY control filters. __

==== Plan for the week 15-08-2019 ====
 * __Finish measuring transfer functions. __
 * __Begin the design of filters. __

=== Type-Bp ===
==== Past week report ====
 * __New auto-measurement system is ready for -Bp. -B templates are now under preparation. __
 * __New VIS app is released. () __

==== Plan for coming weeks ====
=== OMMT & OSTM (Takahashi) ===
==== Past week report ====
 * __Evaluated 9 of 16 OSEMs. 7 OSEMs are not useful. __
 * __Assembled the mirror gluing jig with the modification parts. __

==== Plan for coming weeks ====
=== VIS electronics ===
==== Past week report ====
==== Plan for coming weeks ====
=== Other site works ===
=== Safety ===
 * __Incidents: __

== Discussion ==
== Travel Plans ==
 * __Travel (Week of 8/12): 
  * Takahashi:
  * Sato:
  * Hirata:
  * Shoda:
  * Fujii: 12-16
  * Tanaka:
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 * __Travel (Week of 8/19): 
  * Takahashi: 22-24
  * Sato:
  * Hirata: 22-24
  * Shoda:
  * Fujii: 20-24
  * Tanaka:
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== Next meeting ==
__On 2019/8/16(Fri) __