Attenuation ratio AR as a function of FRP-damper thickness based on Eq. (6). The calculated attenuation ratio using thermal diffusivity from 10−4 to 10−7 m2/s is shown. Experimental results are also shown for the temperature controlled at 4.2000 and at 5.0000 K for the sample stage. Closed and open circles indicate stainless steel (SS) and FRP screws, respectively.
Typical time series of the temperature fluctuation on the cryohead, the Cu block, and the sample stage using a 4.2000 K temperature feedback control with two heaters for a 1.12-mm-thick FRP damper between the cryohead and the Cu block, and a 0.76-mm-thick FRP damper on the sample stage. Acquired sampling frequency is 50 Hz. An inset shows an enlarged view from 3.2 to 4.7 s.
Temperature fluctuation at the cryohead, the Cu block, and the sample stage as functions of FRP thickness on the sample stage. A 1.12-mm-thick FRP damper and FRP screws between the cryohead and the Cu block were used. An inset shows the decreasing ratio between the sample stage and the Cu block.
Temperature fluctuation at the cryohead, the Cu block, and the sample stage as a function of the temperature of the sample stage. An inset shows the attenuation ratio (AF) between the sample stage and the cryohead as a function of temperature of the sample stage.
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