Reports until 16:10, Thursday 17 October 2013
H1 SEI
richard.mittleman@LIGO.ORG - posted 16:10, Thursday 17 October 2013 - last comment - 14:38, Monday 21 October 2013(8152)
ITMY HEPI

ITMY now has two HEPI controllers installed (both of which work I think)

 

Control Level one is a positon sensor only ~5Hz UUG  in all DOF (VP and HP are AC coupled at some low frequency (<1mhz))

Control Level two, uses the second set of blend filters (lil bit iso) just the second button and has ~10Hz UUG (5Hz for VP and HP)

  It blends X,Y Z and rZ at about  0.5Hz  and rX and rY at about 0.8Hz

 

  I tried to design with minimum gain peaking every where (< a factor of two if you believe  linear control theory, which HEPI doesn't always)

  I characterized this controller in /ligo/svncommon/Seisvn/seismic/HEPI/H1/ITMY/Data/Spectra/Preformance_A.xml

 

There are three screen shots from this dtt attached, the Ref plots are with HEPI controls ON

 

The orange like color  and green are the ISI stage 1 T240 modal signals HEPI on/off

The pinkish  or grey and blue are the HEPI L4C signals on/off

red and pinkish are sts2 ground signals during the two tests

 

I don't really believe all of that isolation in the rotational directions, not sure why it is there .....

 

 

  **** the HEPI on script doesn't seem to be working so well hopefully this will get fixed soon ****

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arnaud.pele@LIGO.ORG - 14:38, Monday 21 October 2013 (8199)

Here are the plots Rich meant to attach :

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