Differences between revisions 2 and 56 (spanning 54 versions)

KAGRA VIS Operations Manual - LVDT

LVDTs are used for vertical sensing and actuation in all the GAS filters and for horizontal sensing and actuation in all the IP stages.

See LVDT Signal Conditioning for useful background on LVDT demodulation.

See JGW-T1201255 for description of the Nikhef-supplied cards, and JGW-T1604798 for more information on how to tune the demodulation circuit.

LVDT Calibration Procedure: JGW-E1707287 or LVDT Calibration Procedure.

LVDT Coil and Driver Data

Type A	Test Mass Suspensions
Type B	BS and SR suspensions
BS Data
SR2 Data
SR3 Data
SRM Data
Type Bp	PR Suspensions
Type C	Modecleaner Suspensions

Yoke Height Settings

The yoke should be set so that the double and single LVDT coils are symmetrically aligned when the keystone is at nominal height. It is convenient to set this in terms of the amount the PEEK coil former sticks out above the filter baseplate.

Bottom Filter (BS and SRx)

Note that the CAD is wrong for the bottom filter yoke:

Standard Filter (BS and SRx)

Top Filter (BS and SRx)

Summary

GAS Filter	Yoke Height	Keystone Height
BS BF	3.5 mm	65.5 mm (up from baseplate)
SR BF	3.5 mm	65.5 mm (up from baseplate)
BS SF	6 mm	65.5 mm (up from baseplate)
SR SF	6 mm	65.5 mm (up from baseplate)
BS F0	36 mm	153 mm (up from top plate), 16.5 mm (down from ring)
SR F0	34 mm	151 mm (up from top plate), 16.5 mm (down from ring)

Type Bp Data

Your data here!

Stocktake

Old: LVDT Stocktake as of 2018-04-13

List of LVDT Driver Boxes

LVDT Driver Module Top Assembly

Currently used drivers

Type-A

Suspension	Rack	S-Number	Note
ETMX		S140????	LVDT 1
ETMX		S140????	LVDT 2
ETMY		S140????	LVDT 1
ETMY		S140????	LVDT 2
ITMX		S140????	LVDT 1
ITMX		S140????	LVDT 2
ITMY		S140????	LVDT 1
ITMY		S140????	LVDT 2

Type-B

Suspension	Rack	S-Number	Note
BS		S140????
SRM		S140????
SR2		S140????
SR3		S140????

Type-Bp

Suspension	Rack	S-Number	Note
PRM		S140????
PRM		S140????
PR2	PR2	S1403047	For GAS filters ?
PR2	PR2	S1403050	For BF damper ?
PR3		S140????
PR3		S140????

AOS

Suspension	Rack	S-Number	Note
ETMX TMS		S140????
ETMY TMS		S140????

Drivers in stock

Location	S-Number	Note
Electric shop	S1407792	To be used for ???. OSC circuit is not installed

Broken

Location	S-Number	Note
Electric shop	S1407786

KAGRA/Subgroups/VIS/OpsManual/LVDT (last edited 2018-09-14 17:27:24 by YoichiAso)

-  ⇤ ← Revision 2 as of 2017-10-05 08:37:51 → 
  Size: 448
  Editor: MarkBarton
  Comment:
+   ← Revision 56 as of 2018-09-14 17:21:49 → ⇥
  Size: 5728
  Editor: YoichiAso
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 2:
-Line 7:
+Line 6:
-See [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1255|JGW-T1201255]] for description of the Nikhef-supplied cards.
+See [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1255|JGW-T1201255]] for description of the Nikhef-supplied cards, and [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4798|JGW-T1604798]] for more information on how to tune the demodulation circuit.

LVDT Calibration Procedure: [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7287|JGW-E1707287]] or [[attachment:LVDT_Calibration.pdf| LVDT Calibration Procedure]].

== LVDT Coil and Driver Data ==
||[[KAGRA/Subgroups/VIS/OpsManual/TypeA|Type A]]||Test Mass Suspensions||
||[[KAGRA/Subgroups/VIS/OpsManual/TypeB|Type B]]||BS and SR suspensions ||
||||[[KAGRA/Subgroups/VIS/OpsManual/TypeB/BSData#lvdt|BS Data]]||
||||[[KAGRA/Subgroups/VIS/OpsManual/TypeB/SR2Data#lvdt |SR2 Data]]||
||||[[KAGRA/Subgroups/VIS/OpsManual/TypeB/SR3Data#lvdt |SR3 Data]]||
||||[[KAGRA/Subgroups/VIS/OpsManual/TypeB/SRMData#lvdt |SRM Data]]||
||[[KAGRA/Subgroups/VIS/OpsManual/TypeBp|Type Bp]]||PR Suspensions||
||[[KAGRA/Subgroups/VIS/OpsManual/TypeC|Type C]]||Modecleaner Suspensions||


=== Yoke Height Settings ===
The yoke should be set so that the double and single LVDT coils are symmetrically aligned when the keystone is at nominal height. It is convenient to set this in terms of the amount the PEEK coil former sticks out above the filter baseplate.

==== Bottom Filter (BS and SRx) ====

Note that the CAD is wrong for the bottom filter yoke:

{{attachment:YokeHeightExample.png| |width=400}}{{attachment:KeystoneHeightExample.png| |width=400}}

=== Standard Filter (BS and SRx) ===

{{attachment:YokeHeightExampleSF.png| |width=400}}

=== Top Filter (BS and SRx) ===

{{attachment:YokeHeightExampleBSF0.png| |width=400}}{{attachment:YokeHeightExampleSRF0.png| |width=400}}

==== Summary ====

||GAS Filter||Yoke Height||Keystone Height||
||BS BF||3.5 mm||65.5 mm (up from baseplate)||
||SR BF||3.5 mm||65.5 mm (up from baseplate)||
||BS SF||6 mm||65.5 mm (up from baseplate)||
||SR SF||6 mm||65.5 mm (up from baseplate)||
||BS F0||36 mm||153 mm (up from top plate), 16.5 mm (down from ring)||
||SR F0||34 mm||151 mm (up from top plate), 16.5 mm (down from ring)||

== Type Bp Data ==
Your data here!

<<Anchor(stocktake)>>
= Stocktake =

[[LVDT20180413|Old: LVDT Stocktake as of 2018-04-13]]

== List of LVDT Driver Boxes ==
[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2826|LVDT Driver Module Top Assembly]]

=== Currently used drivers ===

==== Type-A ====
||Suspension||Rack||S-Number||Note||
||ETMX || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 1||
||ETMX || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 2||
||ETMY || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 1||
||ETMY || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 2||
||ITMX || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 1||
||ITMX || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 2||
||ITMY || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 1||
||ITMY || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]||LVDT 2||

==== Type-B ====
||Suspension||Rack||S-Number||Note||
||BS || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||SRM || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||SR2 || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||SR3 || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
==== Type-Bp ====
||Suspension||Rack||S-Number||Note||
||PRM || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||PRM || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||PR2 ||PR2||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3047|S1403047]]||For GAS filters ?||
||PR2 ||PR2||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3050|S1403050]]||For BF damper ?||
||PR3 || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||PR3 || ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
==== AOS ====
||Suspension||Rack||S-Number||Note||
||ETMX TMS|| ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||
||ETMY TMS|| ||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=????|S140????]]|| ||

=== Drivers in stock ===
||Location||S-Number||Note||
||Electric shop||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7792|S1407792]]||To be used for ???. OSC circuit is not installed||

=== Broken ===
||Location||S-Number||Note||
||Electric shop||[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=7786|S1407786]]||||