Force realization system and deviceWe report the characterization of mechanical properties of a flux-quantum force device, which is designed and fabricated to trap superconducting flux quantums for generating pico-newton standard forces, at variable temperature. Using our scanning fiber imaging technique we micro-positioned an optic fiber onto the target position of the device and measured the device's vibration to obtain a resonance frequency of 1167 Hz at 4.5 K and a spring constant of 2 10 -4 N/m at room temperature.System. For excellent vibration isolation, as shown in figure 2, the liquid helium (L-He) Dewar is mounted on air spring II, which is placed on a 20 ton concrete block. The concrete block is also supported by air spring I or isolation pad, selectively. In the L-He dewar, a He-3 refrigerator is inserted, which contains a force realization stage at the bottom inside an inner vacuum chamber (IVC) [4]. The IVC is surrounded by superconducting magnets for uniform and gradient magnetic field. The force realization stage, not shown in Fig. 2, consists of two sets of x-y-z nano-stages, optic fiber interferometer, a local heater, a Cernox thermometer, a Hall sensor, and so on.
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