Reports until 16:39, Monday 17 November 2014
H1 SEI
hugh.radkins@LIGO.ORG - posted 16:39, Monday 17 November 2014 (15112)
WBSC1 ITMY HEPI Position Controllers

With the correction (update) of the L2C2L matrices planned for possibly tomorrow, I went through the controller development (required) using generic loops Hugo designed (SEI log 489.)  These are 5hz UUG controllers.  The vertical dofs looked okay but X Y & RZ looked a bit marginal around the UUG--see first attachment.  This plot shows the 5hz generic controller for X; the gain peaking is higher than comfortable and the phase margin is marginal.  The controllers for Y & RZ are marginally less marginal.  I made a new controller set with 2Hz UUG and and reduced the boost zero from 1 to 0.7hz on X Y & RZ.  I'll keep the 5hz controllers for the vertical dofs and go with these more conservative filters for the horizontal dofs.

The pdf attachment shows all eight controllers I plan to install tomorrow if allowed.

The second image attachment is the only controller I found saved in the svn.  It looks pretty wild but it doesn't quite match the foton filter so I don't know if it really represents the controllers we've been using.  Still it sort of represents the wild west in our controller development evolution.

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