christopher.biwer@LIGO.ORG - posted 17:04, Tuesday 17 November 2015 - last comment - 17:40, Thursday 19 November 2015(23486)
Initial checks for PCAL hardware injection actuation budget
We would like to know the range of counts we have available for doing hardware injections with PCAL. Hardware injections are filtered with an inverse actuation filter to get from strain to counts, this is the CAL-PINJX_HARDWARE filterbank. Here I've filtered waveforms with the CAL-PINJX_HARDWARE filterbank and see how many counts they require. I've attached plots of the time series in counts. Last Thursday a filter was added to compensate for the upsampling that is done in the analog electronics. This seems to have a significant effect on the counts. I did a test with the coherentbbh0 waveform (used in hardware injections tests before) and saw that it increased its counts by a factor of ~3. I've attached plots for before and after adding this filter. Here I report the max number of counts from the waveforms: * CW injections: ~1500 counts * 1.4-1.4 non-spinning SEOBNRv2 waveform (target SNR is ~15): 7e7 counts * 25-25 non-spinning SEOBNRv2 waveform (target SNR is ~15): ~10000 counts * coherentbbh0 waveform from hardware injections tests (recovered SNR is ~18-23): ~20000 counts Note these SNRs are approximates and can change depending on sky location. It was quoted that perhaps the CW injections could change by a factor of 2. There is also a higher-frequency line that gets injected in PCALX and we need to take this into consideration as well.
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I filtered the 1.4-1.4 non-spinning BNS template with and without the inverse anti-imaging filter that was added last week. The first plot is the h(t) time series for the waveform. It is near the time of the merger where the maximum number of counts occurs. The second plot is the filtered time series in counts without the inverse anti-imaging filter. The maximum is 5e6 counts. The third plot is the filtered time series in counts with the inverse anti-imaging filter. The maximum is 7e7 counts.
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