Differences between revisions 7 and 18 (spanning 11 versions)

Agenda/Minutes of the VIS Meeting on 2019/8/16

2019/8/16 14:00 - 15:30

Zoom Meeting

Participants: Takahashi, Fabian, Aso, Tanaka, Ishizaki, Lucia, Fujii, Miyo, Shoda

Progress report

Type-A

Past week report

For the 150mHz-ish mode damping
- sensor correction for IP, i.e., seismic signal subtraction system, was implemented to all the type-A suspensions.
- BF-L/T damping was also implemented for this damping.
  - The RMS was suppressed by a factor of like 2.7, log 9961
- (SC at IP) + (BF-L/T) made the system quieter compared to the previous, however, it was not enough
  - IP-TF does not have the peak at 150mHz-ish.
  - BF-actuation efficiency is not so high.
  - => we will try to the feedback like BFl to IPL, or TML to IPL, for the next.
    - For this purpose, we have to modify the model again.
For inertial damping performance test, LVDT damping vs. inertial damping > By Lucia
- ETMY: 9981
- ITMX: 9995
  - What is the summary for this week?
length-oplev calibration with green lock
- log: 9989
- 1st trial. The values are *NOT* installed to the MEDM since we could not guarantee if we were observing TML motion not TMY motion. It looks they are not terrible values, compared to ground motion though.
F3-GAS of EY: looks stacked again
- log at 2019 Aug. 15th, when it was stuck: 9990
- log at 2019 Aug. 15th, when it was free: 9293
  - The difference between the above is like about 405um (it went to lower position), based on GAS_LVDTINF_OUT channel.
ETMY health check
- lopg: 9996 => status and plan?
Listed up the modification parts in the 3D CAD model.

Plan for coming weeks

Guardian stuff
- utilize the TMY to BFY loop again, etc.
RTmodel modification
- make paths from TM to IPL, BFL to IPL.
150mHz-ish suppression
- implement loops like TM to IP.

Type B

Report for the week 15-08-2019

Shoda-san improved the SR3 optic yaw motion (klog 9949).
- Improvement in the frequency band from 1 Hz to 2.3 Hz was achieved by modifying the IM-Y filter. The problem was not enough phase margin.
- There's still a peak at 1.3 Hz.
- She also modified the IM SENSALIGN matrix (diagonalization according to resonance peaks?)
- Transfer functions should be measured again.
The BS optic has a large peak at 150 mHz (klog 9991).

Plan for the week 19-08-2019

Enomoto-kun requested to extend the oplev control loop down to where the micro-seismic peak is. (Fabian.)
Assemsment of the motion of the SR optics around the micro-seimic region. (Due today.)

Type-Bp

Past week report

Plan for coming weeks

OMMT & OSTM (Takahashi)

Past week report

Ordered the dummy mirror to be used for gluing test.

Plan for coming weeks

VIS electronics

Past week report

Plan for coming weeks

Other site works

Safety

Incidents:

Discussion

For the people in Kamioka, checking the presence/absence at the site will help us (not only for Mitaka persons).

Travel Plans

Travel (Week of 8/19):
- Takahashi: 22-24(F2F)
- Sato:　
- Hirata:
- Shoda:
- Fujii: 19-24
- Tanaka:
- Fabian: 22-24(F2F)
Travel (Week of 8/26):
- Takahashi:
- Sato:
- Hirata:
- Shoda:
- Fujii: 26-30
- Tanaka: 26-30

Next meeting

On 2019/8/30(Fri)

KAGRA/Subgroups/VIS/VISMinutes20190816 (last edited 2019-08-16 15:51:08 by YoichiAso)

-  ⇤ ← Revision 7 as of 2019-08-16 10:21:50 → 
  Size: 2783
  Editor: YoshinoriFujii
  Comment:
+   ← Revision 18 as of 2019-08-16 15:51:08 → ⇥
  Size: 3964
  Editor: YoichiAso
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
-/8/16 14:00 -
+/8/16 14:00 - 15:30
-Line 7:
+Line 6:
-Participants:
+Participants: Takahashi, Fabian, Aso, Tanaka, Ishizaki, Lucia, Fujii, Miyo, Shoda
-Line 12:
+Line 11:
-* For the 150mHz-ish mode damping
 * sensor correction for IP, i.e., seismic signal subtraction system, was implemented to all the type-A suspensions.
  * The RMS was suppressed by a factor of like 2.7, log [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9961|9961]]
 * BF-L/T damping was also implemented for this damping.
 * (SC at IP) + (BF-L/T) made the system quieter compared to the previous, however, it was not enough
  * IP-TF does not have the peak at 150mHz-ish.
  * BF-actuation efficiency is not so high.
  * => we will try to the feedback like BFl to IPL, or TML to IPL, for the next.
+ * For the 150mHz-ish mode damping
  * sensor correction for IP, i.e., seismic signal subtraction system, was implemented to all the type-A suspensions.
  * BF-L/T damping was also implemented for this damping.
   * The RMS was suppressed by a factor of like 2.7, log [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9961|9961]]
  * (SC at IP) + (BF-L/T) made the system quieter compared to the previous, however, it was not enough
   * IP-TF does not have the peak at 150mHz-ish.
   * BF-actuation efficiency is not so high.
   * => we will try to the feedback like BFl to IPL, or TML to IPL, for the next.
-Line 22:
+Line 21:
+ * For inertial damping performance test, LVDT damping vs. inertial damping > By Lucia
  * ETMY: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9981|9981]]
  * ITMX: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9995|9995]]
   * What is the summary for this week?
-Line 23:
+Line 26:
-* For inertial damping performance test > By Lucia
 * ETMY: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9981|9981]]
 * ITMX: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9995|9995]]
  * What is the summary for this week?
+ * length-oplev calibration with green lock
  * log: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9989|9989]]
  * 1st trial. The values are *NOT* installed to the MEDM since we could not guarantee if we were observing TML motion not TMY motion. It looks they are not terrible values, compared to ground motion though.
-Line 28:
+Line 30:
-* length-oplev calibration with green lock
 * log: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9989|9989]]
 * 1st trial. The values are *NOT* installed since we could not guarantee if we were observing TML motion not TMY motion. It looks they are not terrible values, compared to ground motion though.
+ * F3-GAS of EY: looks stacked again
  * log at 2019 Aug. 15th, when it was stuck: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9990|9990]]
  * log at 2019 Aug. 15th, when it was free: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9293|9293]]
   * The difference between the above is like about 405um (it went to lower position), based on GAS_LVDTINF_OUT channel.
-Line 32:
+Line 35:
-* F3-GAS of EY: looks stacked again
 * log at 2019 Aug. 15th, when it was stacked: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9990|9990]]
 * log at 2019 Aug. 15th, when it was free: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9293|9293]]
   * The difference between the above is like about 405um (it went to lower position.), based on GAS_LVDTINF_OUT channel.
+ * ETMY health check
  * lopg: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9996|9996]] => status and plan?
-Line 37:
+Line 38:
-* ETMY health check
 * lopg: [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9996|9996]]
  => status and plan?
+ * Listed up the modification parts in the 3D CAD model.
-Line 43:
+Line 41:
-* Guardian stuff
 * utilize the TMY to BFY loop again, etc. 
* RTmodel modification
 * make paths from TM to IPL, BFL to IPL. 
* 150mHz-ish suppression
 * implement loops like TM to IP.
+ * Guardian stuff
  * utilize the TMY to BFY loop again, etc.
 * RTmodel modification
  * make paths from TM to IPL, BFL to IPL.
 * 150mHz-ish suppression
  * implement loops like TM to IP.
-Line 52:
+Line 49:
-==== Past week report ====
==== Plan for coming weeks ====
+==== Report for the week 15-08-2019 ====
 * Shoda-san improved the SR3 optic yaw motion (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9949|9949]]).
  * Improvement  in the frequency band from 1 Hz to 2.3 Hz was achieved by modifying the  IM-Y filter. The problem was not enough phase margin.
  * There's still a peak at 1.3 Hz.
  * She also modified the IM SENSALIGN matrix (diagonalization according to resonance peaks?)
  * Transfer functions should be measured again.
 * The BS optic has a large peak at 150 mHz (klog [[http://klog.icrr.u-tokyo.ac.jp/osl/?r=9991|9991]]).

==== Plan for the week 19-08-2019 ====
 * Enomoto-kun requested to extend the oplev control loop down to where the micro-seismic peak is. (Fabian.)
 * Assemsment of the motion of the SR optics around the micro-seimic region. (Due today.)
-Line 58:
+Line 64:
+=== OMMT & OSTM (Takahashi) ===
==== Past week report ====
 * Ordered the dummy mirror to be used for gluing test.
-Line 59:
+Line 68:
-=== OMMT & OSTM ===
==== Past week report ====
-Line 62:
+Line 69:
-Line 66:
+Line 72:
-Line 68:
+Line 73:
-Line 73:
+Line 77:
+ * For the people in Kamioka, checking the presence/absence at the site will help us (not only for Mitaka persons).
-Line 76:
+Line 81:
-  * Takahashi: 
  * Sato: 
  * Hirata:
+  * Takahashi: 22-24(F2F)
  * Sato: 
  * Hirata:
-Line 80:
+Line 85:
-  * Fujii:
+  * Fujii: 19-24
-Line 82:
+Line 87:
+  * Fabian: 22-24(F2F)
-Line 84:
+Line 90:
-  * Takahashi: 
  * Sato: 
  * Hirata:
+  * Takahashi:
  * Sato:
  * Hirata:
-Line 88:
+Line 94:
-  * Fujii: 
  * Tanaka:
+  * Fujii: 26-30
  * Tanaka: 26-30
-Line 92:
+Line 98:
-On 2019/8/29(Fri)
+On 2019/8/30(Fri)