The resonant-mass gravitational wave detector SCHENBERG was designed by the Brazilian group Graviton to be sensitive to a central frequency nearing 3200 Hz and a bandwidth of 200 Hz. It has a spherical antenna weighing 1150 kg that is connected to the outer environment by a suspension system designed to attenuate local noise due to seism as well as other sources. Should a gravitational wave pass by the detector, the antenna is expected to vibrate. This motion will be monitored by six parametric transducers whose output signals will be digitally analyzed. In order to improve the sensitivity of the detector, it must be cooled down to the lowest possible temperature, and for this purpose a dilution refrigerator is planned to be implemented in the detector. It is known that such device produces vibration when operational, consequently introducing noise in the system. Using the finite elements method, this work investigates thermal connections between the dilution refrigerator and the sphere suspension that allow the detector to operate within its projected sensitivity. The finite elements method showed an attenuation of 240dB in the best-valued thermal connection.

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关于 SCHENBERG 引力波探测器的稀释冰箱热连接

共振质量引力波探测器 SCHENBERG 由巴西 Graviton 集团设计，对接近 3200 Hz 的中心频率和 200 Hz 的带宽敏感。它有一个重达 1150 公斤的球形天线，通过一个悬挂系统连接到外部环境，该系统旨在衰减由地震和其他来源引起的局部噪声。如果引力波通过检测器，天线预计会振动。该运动将由六个参数传感器监控，其输出信号将进行数字分析。为了提高检测器的灵敏度，必须将其冷却到尽可能低的温度，为此计划在检测器中实施稀释制冷机。众所周知，这种设备在运行时会产生振动，从而在系统中引入噪声。使用有限元方法，这项工作研究了稀释制冷机和球体悬架之间的热连接，允许探测器在其预计灵敏度内运行。有限元方法在最佳值的热连接中显示了 240dB 的衰减。