LIGO Document E1200907-v1

Modifications to the common mode boards

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E - Engineering documents
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As a result of the one arm test a number of changes need to be propagated to all other ALS end station boards. The modifications affect the transfer functions for the laser locking and the cavity locking. It adds low pass filtering to suppress PZT resonances and it fixes a gain in the slow controls readback. As a consequence the previously identical ALS boards are now split into two types: LL (laser locking) and ALS (cavity locking).
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Common Mode Servo Board
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