Differences between revisions 23 and 24

Agenda/Minutes of the VIS Meeting on 2020/4/17

2020/4/17 14:00 -

Participants:

Progress report

(Miyo) I'm gathering information about the hardware.

Calibration factors of LVDTs at JGW-T2011597. Please give me comments especially Type-A and Type-Bp. Type-B is OK. Thank you fabian!
Cabling diagram at JGW-D2011573, which includes connections between AEL circuits and pin assignment at the feed-through. I need information about the pin assignment for all suspensions to make the diagram. -> Sato-san?(about Type-A) and Shoda-san? (about Type-Bp)

For a summary of the current status of inertial damping in Type-B suspensions see the appendix (p14 onwards) in this presentation shown the Commissioning Meeting on the 27th of September 2019.
In the context of writing a paper I gathered information about OSEMs and LVDTs and uploaded a document at : JGW-T2011612, which I will be updating.Currently the content is
- Linear ranges of 24 OSEMs and
- Sensitivity of the six SRM OSEMS.
I gave feedback to Miyo-kun about LVDTs: all the current calibration factors in medm screens are consistent with klog reports. Just as a reminder:
- The polarity of LVDTs is set in hardware: increase in LVDT output always means upwards motion or positive yaw in the IPs. Therefore, calibration factors in medm screens should always be positive.
- An exception seems to be BS IP H2 LVDT, whose medm screen I have to check for a minus sign somewhere.
- The offsets in medm screens correspond to the nominal places of keystones per the 3D-CAD, not the mid-point of the linear range.

On 2020/4/24(Fri)

KAGRA/Subgroups/VIS/VISMinutes20200417 (last edited 2020-04-18 10:45:23 by RyutaroTakahashi)

-  ⇤ ← Revision 23 as of 2020-04-17 12:08:02 → 
  Size: 3189
  Editor: KousekiMiyo
  Comment:
+   ← Revision 24 as of 2020-04-17 12:12:04 → ⇥
  Size: 3222
  Editor: KousekiMiyo
  Comment:
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- * Calibration factors of LVDTs at [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11597|JGW-T2011597]]. 
 * For O4, I'm also preparing the cabling diagram at [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11573|JGW-D2011573]]for all VIS suspension, which includes connections between AEL circuits and pin assignment at the feed-through. '''I need information about the pin assignment for all suspensions''' to make the diagram. -> Sato-san?(about Type-A) and Shoda-san? (about Type-Bp)
+ * Calibration factors of LVDTs at [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11597|JGW-T2011597]]. Please give me comments especially Type-A and Type-Bp. Type-B is OK. Thank you fabian!
 * Cabling diagram at [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11573|JGW-D2011573]], which includes connections between AEL circuits and pin assignment at the feed-through. '''I need information about the pin assignment for all suspensions''' to make the diagram. -> Sato-san?(about Type-A) and Shoda-san? (about Type-Bp)