Virgo Logbook

WI TCS power has been increased from 0.76W to 0.9 W (fig 1). Since we suspect that a high finesse asymmetry could have some negative effect on the sensitivity (higher coupling of dihedron peaks, more glitches at low frequency), we come back to a lower value.
Actually the coupling of dihedron peaks changed (fig 2). We can retune the modulation frequency to the standard value.
The glitchness seems unchanged (fig 3). But we have to take in account that the microseismic activity is growing up as well. We need a longer period of observation before drawing any conclusion.