edgard.bonilla@LIGO.ORG - posted 09:36, Thursday 16 August 2018 (43466)
ISIFF installed at ITMX
Edgard, Hang.
On Tuesday, we designed and installed the ISIFF filters for ITMX. The procedure followed was similar to the one described in LHO:42875.
The attachment shows the filter installed in the ISIFF_L2P filter bank. The data points correspond to (ISI-L --> L3OPLEV_P)/(M0-P --> L3OPLEV_P), while the orange trace was fitted using IIRational.
The fitting code only used data points with a coherence >0.5, which was set as an arbitrary cutoff. The fit is reasonably good up to ~1 Hz.
More details on the performance of the filter, as well as information on the script used for the fitting will be posted soon.
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The DTT templates for driving the transfer functions needed to design the filter have been committed here:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/Common/Data/
2018-08-14_H1SUSITMX_M0_ISIFF_FilterDesign_ISIST2L_2_L3P.xml
2018-08-14_H1SUSITMX_M0_ISIFF_FilterDesign_M0P_2_L3P.xml
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/Common/Data/
2018-08-14_H1SUSITMX_M0_ISIFF_FilterDesign_ISIST2L_2_L3P.xml
2018-08-14_H1SUSITMX_M0_ISIFF_FilterDesign_M0P_2_L3P.xml
And the exported data files live here
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/Common/Data/
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_ISIST2L_2_L3P_coh.txt
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_ISIST2L_2_L3P_tf.txt
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/Common/Data/
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_ISIST2L_2_L3P_coh.txt
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_ISIST2L_2_L3P_tf.txt
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_M0P_2_L3P_coh.txt
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_M0P_2_L3P_tf.txt
2018-07-13_H1SUSITMX_M0_ISIFF_FilterDesign_M0P_2_L3P_tf.txt
The transfer function files have been exported as FREQ MAG PHA(rad).
Images attached to this report
