Journal of Astronautic Metrology and Measurement ›› 2023, Vol. 43 ›› Issue (3): 16-20.doi: 10.12060/j.issn.1000-7202.2023.03.04

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Research on Two-stage SQUID Amplifier for Signal Readout of Metallic Magnetic Calorimeter

LI Tai-yu1,ZHENG Yi-ning2,XU Yuan-xing3,*,CHEN Ying-yu2,TANG Li-hong2,ZHAO Yue2,WANG Chao-qun2,XIE Hang-xing3,GAO Bo2,WANG Zhen2   

  1. 1.Shanghai University,Shanghai 200444,China；
    2.Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China；
    3.Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China
  • Online:2023-06-25 Published:2023-07-08

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Abstract: Metallic Magnetic Calorimeter (MMC) is a low-temperature photon detector with high energy resolution.The heat generated by photon absorption induces a rapid change of the magnetization of a metallic paramagnetic film.Precise measurements of the magnetization signal provides an accurate way to deduce the photon energy.the readout of MMC relies on low noise current amplifiers based on Superconducting Quantum Interference Devices (SQUID).The research report a two-stage SQUID amplifier circuit for MMC.The first stage SQUID adopts a 2nd order gradiometer design,which makes the amplifier less sensitive to the environmental noise.At liquid helium temperature,the circuit working in the flux-locked-loop mode achieved a transimpedance gain of 27 400 V/A,and a white noise floor of 11.5 pA/Hz1/2.

Key words: Metallic Magnetic Calorimeter (MMC), Superconducting Quantum Interference Device (SQUID), Second-order parallel gradiometer

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