updates

main/laserstab.tex

@@ -37,6 +37,7 @@ The major advantages is that this system can improve sensitivity, thermal noise,
 \noindent
 What we expect from 6D is isolation at low frequencies and reduction of fundamental noises: the thermal noise of the suspension is suppressed by the quasi-monolithic, fused-silica fibre; temperature gradients are kept under control thanks to the vacuum enclosure.\\
 The expected performance is shown in Fig. \ref{6dsens}: the 6D isolator provides an improvement of the performance of more than two orders of magnitude with respect to what is possible with state of the art seismometers \cite{6d}.\\
+The key point is to reduce the motion in order to limit the control noise and allow the bandwidth of control loops to be lowered. This is a goal set for a detector sensitive to low frequencies, and for which the 6D device can contribute \cite{yu}.
 
 %The control noise will become negligible above 5Hz because the bandwidth for the control loops will be reduced to 0.5 Hz.
 

main/oplevs.tex

@@ -563,7 +563,7 @@ Some peaks at lower frequencies may be due to bench motion: if the assumption is
 The movement of South bench along z axis is used as a reference to monitor the bench adjustments with temperature variations. The variable under examination is displacement tested by a Linear Variable Displacement Transformer (LVDT).
 
 \subsection{Final vacuum set up}
-The pressure has been set at 5 $\times$ 10$^{-3}$ mbar. What we expect is to find no variations in terms of the peaks we think are due to power fluctuations. Variations in LVDT trend can be due to temperature stabilization and related variations of pitch and yaw are then due to the more stable bench conditions (Fig. \ref{LVDT_FIN}.\\
+The pressure has been set at 5 $\times$ 10$^{-3}$ mbar. What we expect is to find no variations in terms of the peaks we think are due to power fluctuations. Variations in LVDT trend can be due to temperature stabilization and related variations of pitch and yaw are then due to the more stable bench conditions (Fig. \ref{LVDT_FIN}).\\
 
 \noindent
 In this conditions, also the signals from the L4C seismometers and accelerometers (Watt's Leakage) placed on the Central bench have been measured (Fig. \ref{central}). The plots with the UoB electronics show that there is some leakage below 10 Hz, probably due to saturation, in the measurement of the accelerometers.\\
@@ -599,7 +599,7 @@ However, with UoB pre-amp the measurements do not seem consistent with what we e
 \paragraph*{Electronic noise}
 Noise measurements of CDS with unplugged electronics have been taken, to check if there could be issues related to it. However, they do not show any unexpected behaviour:  CDS dominates nearly everywhere and the CDS noise is lower than any of our optical measurements everywhere, typically by at least a factor of 10.
 
-\begin{figure}[H]
+\begin{figure}[h!]
 \centering
 \includegraphics[scale=0.3]{images/EL_NOISE.PNG}
 \caption[Electronic noise]{Measurements of CDS noise and output of unplugged electronics.}