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Optomechanics with Superfluid Helium 4

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Figure

Figure 1.1: The heat capacity of helium versus temperature. The transition point at 2.17 K is known as Tλbecause of the shape of the heat capacity through transition.
Figure 2.2: Diagrams of our superfluid optomechanical systems: a) the cylindrical niobium cell with an innerdiameter of 3.56 cm and height of 3.95 cm
Figure 2.4: The profiles of every superfluid acoustic mode for the niobium cavity design up to a frequency of12 kHz
Figure 2.5: A simplified representation of the thermal conduction from the superfluid helium to the mixingchamber.The helium is treated as a capacitance CHe connected to the cell CNb through the Kapitzaboundary resistance RK, and the cell is connected to the
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