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Interferometer_sensitivity_studies (General)
Calloni, Chiummo, Mantovani, Tacca, Vajente - 11:14 Thursday 23 June 2011 (29728) Print this report
Calibration lines and Vela
Following the suggestion of later entries (29724) we took some data switching off calibration lines. Alignment lines are left on.

switching off NE zMAR 13.6 Hz line:
Time: Jun23,11-10:21:58 -> GPS: 992852533
Time: Jun23,11-10:31:59 -> GPS: 992853134
all calibration lines off (excluding locking ones):
Time: Jun23,11-10:34:03 -> GPS: 992853258
starting of other activities, lines still off:
Time: Jun23,11-11:06:24 -> GPS: 992855199

The attached plot shows that there is no significant effect when the 13.6 Hz is switched off. Instead the effect is very large when all calibration lines are off: the bump around the Vela is no more there. The second plot shows the same comparison, just with more averages.

More investigations are needed to understand which lines are causing this bump.
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