Abstract
Korea Research Institute of Standards and Science (KRISS) has started to design a Superconducting Gravimeter system based on a SQUID sensor. In this paper, we describe the design and fabrication of fundamental components of the superconducting circuit. Heat switches (HSWs) were fabricated using surface-mounted device (SMD) resistors and niobium (Nb) wires in a variety of ways to provide DC current to superconducting coils. The HSWs were tested regarding response time, wave form, and aging features at a cryogenic temperature (4.2 K) for 40 days. These results allowed us to optimize the HSW designs, superconducting housing, and superconducting circuits of the system. The system was designed as a drive controller to inject constant current into the superconducting coils and to control the operating times of the HSWs and the constant current. In addition, we also describe a suitable method for calculating the inductance of the closed superconducting loops.
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