Geometrical parameters useful to calculate the equilibrium condition. Only when , at each small oscillation around the (horizontal) equilibrium position corresponds an increase in the vertical coordinate of the c.m.
Scheme of the half sphere clamp. The collar (a) is tightened with three screws onto the base (b). The hole in the collar is conical and it is sufficiently wide to let the tip of the half sphere to come out about 1 mm. The base (b) is clamped on a rigid plate inside the vacuum tank. (c) is a zoomed view of the clamped half sphere.
Picture of the fused silica disk on top of GeNS and the mirrors used for the optical lever.
Microscope image of the surface of the steel sphere after some suspensions. It is possible to see that the sphere has been damaged by the disk and by the clamp.
Measured for the first butterfly mode of the Herasil®HOQ300 disk vs the residual pressure inside the vacuum chamber. The limiting pressure is about .
vs frequency for different wedges. Top: Herasil®HOQ300 disks ( and ) on a steel sphere . Bottom: Herasil®HOQ300 disks ( and ) on a steel sphere .
Map of values for the first butterfly mode of Suprasil®311. The highest and lowest values are and , respectively.
Map of values for the second butterfly mode of Suprasil®311. The highest and lowest values are and , respectively.
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