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• LVDT

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

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

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

Type-B

Type-Bp

AOS

Drivers in stock

Broken

LVDT cards

• Number of Input Cards in stock: ??
• Number of broken input cards (taken out of the driver chasis): ??
• Number of Mainboards in stock: ??
• Number of broken Mainboards: ??