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<<TableOfContents(3)>>
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[[Old: LVDT Stocktake as at 2018-04-13|LVDT20180413]] [[LVDT20180413|Old: LVDT Stocktake as of 2018-04-13]]
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See [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2826|JGW-D1402826-v2: LVDT Driver Module Top Assembly]]. == List of LVDT Driver Boxes ==
[[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2826|LVDT Driver Module Top Assembly]]
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* = sighted recently === Currently used drivers ===
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== Faulty (3) ==
 * S1807786*: 2018-04-11 Found to be faulty - returned to Mozumi by Enzo
 * S1807785*: Failed during measurement 2019/2/20
 * S1403130: Both of them are in a bad condition. The S number of the Input LVDT Card is shown below. // S1403106 // S1403161 // (2017/07/21 AEL)
==== 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||
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== In use, presumably OK (14) ==
 * S1807787: 2018/4/4: Moved to NAOJ for TMS by Miyakawa, Akutsu
 * S1807783: 2018-03-12 Moved to SR3 rack area for SR3/SRM by Mark, Enzo
 * S1807784: Installed to IXV. 2018/2/14
 * S1403137: [2017/09/29] Installed into K1EX2 rack by K. Okutomi
 * S1403049: [2017/07/25] Installed into K1EX2 rack by K. Okutomi
 * S1403048: Installed into EY2 rack by K. Okutomi, June 9, 2017 // We replaced the front panel with that of Ver. 2.(EY1 Rack) 2017/07/13 AEL
 * S1403047: Moved to PR2 rack (June 2017) // We replaced the front panel with that of Ver. 2.(PR2 Rack) 2017/07/06 AEL
 * S1403133: Installed for PR3 BF LVDTs (Feb 2017) // We replaced the front panel with that of Ver. 2.(PR0 Rack) 2017/07/06 AEL
 * S1403046: We replaced the front panel with that of Ver. 2.(EY1 Rack) 2017/07/13 AEL
 * S1403131: We replaced the front panel with that of Ver. 2.(PR0 Rack) 2017/07/06 AEL
 * S1403050: We replaced the front panel with that of Ver. 2.(PR2 Rack) 2017/07/06 AEL
 * S1403044: 2017-11-16 SR3 rack was reassigned as SR2 by Mark, Miyakawa. Chassis was confirmed to be inside.
 * S1403052: Brought into the tunnel (PR3) on November 19, 2015 // We replaced the front panel with that of Ver. 2.(BS Rack) 2017/07/06 AEL ????
 * S1403136: We replaced the front panel with that of Ver. 2.(PR0 Rack) 2017/07/06 AEL
==== 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????]]|| ||
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== In use, needs new front panel (1) ==
 * S1403020: 2018-04-12 Installed in SRM to replace faulty 7786 by Enzo. (Still has old-style panel.)
=== 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||
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== In circuit room (11) ==
 * S1403132*: We replaced the front panel with that of Ver. 2. 2017/07/10 AEL (Keep in circuit room after replacement)
 * S1403134*: We replaced the front panel with that of Ver. 2. (2017/07/27 AEL)
 * S1403051*: We replaced the front panel with that of Ver. 2. 2017/07/10 AEL
 * S1403045: We replaced the front panel with that of Ver. 2. 2017/07/10 AEL
 * S1403139*: We replaced the front panel with that of Ver. 2. 2017/07/10 AEL
 * S1403138*: We replaced the front panel with that of Ver. 2. 2017/07/10 AEL
 * S1807792: Assembled in Kamioka (OSC circuit is not installed). 2018/2/9
 * S1807791: Assembled in Kamioka (OSC circuit is not installed). 2018/2/9
 * S1807790: Assembled in Kamioka (OSC circuit is not installed). 2018/2/9
 * S1807789: Assembled in Kamioka (OSC circuit is not installed). 2018/2/9
 * S1807788: Assembled in Kamioka (OSC circuit is not installed). 2018/2/9

== In circuit room, needs new front panel (1) ==
 * S1403135: It needs to be replaced with a panel of Ver. 2.(2017/07/18 AEL)
=== 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)