sheila.dwyer@LIGO.ORG - posted 15:28, Friday 16 September 2016 - last comment - 16:21, Friday 16 September 2016(29764)
PSL table moving more
Lisa, Sheila, Ed
Durring ER9, the intensity/jitter noise in DARM was worse than inO1, but not as bad as now. We looked at the PSL accelerometers, and see that the table is moving about a factor of 5 more over a broad range of frequencies from 150-550 Hz. The coherence of DARM with PSL table acclerometers and the ISS PD is also increased compared to July. The last panel shows the coherence of the table accelerometer with the ISS PD. Ed trended PSL pressures, and found that the flow rate durring ER9 was 0.5lpm, compared to 0.7lpm now.
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Past 78 days chiller trends showing mainly flowrates.
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So we asked Peter to reduce the flow rate, thinking that the increased flow rate wrt July contributes to the higher intensity noise we observe now. This will be done on Monday morning.