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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]]||||

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:

YokeHeightExample.pngKeystoneHeightExample.png

Standard Filter (BS and SRx)

YokeHeightExampleSF.png

Top Filter (BS and SRx)

YokeHeightExampleBSF0.pngYokeHeightExampleSRF0.png

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)