fabrice.matichard@LIGO.ORG - posted 09:47, Friday 16 July 2010 - last comment - 17:56, Friday 16 July 2010(75)
Damping Loops for HAM-ISI Unit 1
Working on the damping loops. The controller will be made of: - a compensation filter to account for the difference in the electronics between HAM 6 and X1. - the original damping loops from eLIGO. The plant, controller, open loop, closed loop and sensitivity are shown on the figure attached. I have updated the G1ISIHAM.txt filter file and loaded the filters in the MEDM. It should be ready to go.
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Corey turned on the damping loop installed installed the morning. It worked very well.
- the first figure of the doc attached shows the power spectrum with Damping On and OFF
- the second figure compare the sensitivity ('Undamped/'Damped') of LLO HAM (Aug 2008) and LHO Unit 1. The performance are very similar, which confirms that we can use the damping loop as they are (modulo electronics change compensation). The plot also shows that the measured performance matches with the prediction (sensitivity curve posted this morning).
I am going to implement H2,H3,V1,V2 and V3.
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All six damping loops are installed and running. Plant, controllers, open loops, closed loops and sensitivity are attached. H1 (solid line), H2 (dash line), and H3 (dash dot line) are on the first plot. They are hard to distinguish which is very good (very nice symmetry). V1 (solid line), V2 (dash line), and V3 (dash dot line) are on the second plot. The second document shows the power spectrum and off. Everything looks good.
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