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학술저널
저자정보
김진목 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 이용호 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 권혁찬 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 김기웅 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 박용기 (Biomagnetism Research Center, Korea Research Institute of Standards and Science)
저널정보
한국초전도학회 Progress in superconductivity Progress in superconductivity 제5권 제1호
발행연도
2003.1
수록면
31 - 37 (7page)

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Wide-bandwidth SQUID current amplifier and its control electronics have been constructed for detecting pulse outputs of a superconducting microcalorimeter. The current amplifier made of a double relaxation oscillation SQUID (DROS) has a bandwidth of 1.2 MHz and typical white noise level of about 6 pA/(equation omitted) Hz. To increase the dynamic range of the current amplifier, the flux-locked loop (FLL) has additional circuits to reset the integrator and to count reset numbers which present the number of passed flux quanta. In this system, dynamic range covers from -65 mA to +65 mA. SQUID electronics are controlled by software to get the optimum FLL condition, and to control the current to bias the transition edge sensor (TES). The electronics are shielded from the outside electromagnetic noises by using an aluminum case of 66 mm ${\times}$ 25 mm ${\times}$ 100 mm, and consist of 2 separate printed-circuit-boards for the current amplifier and the control electronics, respectively. The SQUID current amplifier and its control electronics will be used in TESs for detecting photons such as UV and X-ray with high energy resolution.

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