Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2018 Impact factor 0.961

Nuclear Science and Techniques

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Temperature detection circuit on the low-temperature superconducting coils

SHEN Jie1,*  LUO JiarongJI ZhenshanCHEN Longwei1
 
QIAN JingMENG Yuedong1   

  1. 1Institute of Plasma Physics, Chinese Academy of Scineces, Hefei 230031, China
    2College of Science, Donghua University, Shanghai 200051, China
  • Received:2012-04-28
  • Contact: SHEN Jie E-mail:shenjie@ipp.ac.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China (No.11005126)

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SHEN Jie, LUO Jiarong, JI Zhenshan, CHEN Longwei, QIAN Jing, MENG Yuedong. Temperature detection circuit on the low-temperature superconducting coils.Nuclear Science and Techniques, 2013, 24(2): 020402     doi: 10.13538/j.1001-8042/nst.2013.02.004

Abstract:

Experimental Advanced Superconducting Tokamak (EAST) is the fully superconducting Tokamak. The EAST magnet system comprises 16 D-shaped toroidal field coils and 14 poloidal field coils which are cooled by supercritical helium at 4.2 K and 3.8 K. The temperature of superconducting coils is measured by Cernox as a new type low-temperature sensor, and monitored during the cooling and operation. The helium temperature can offer reference for quench signal. In this paper, a technique for the weak temperature signal measurement of superconducting coils is introduced, and its weak voltage is extracted from the intrinsic noise of the amplifier by the low-noise instrumentation amplifier, filter circuit, and high-linearity analog optocoupler. The temperature detection circuit works accurately and safely whether in cooling or operating process. This technique is an effective for the temperature detection on the low-temperature superconducting coils.

Key words: Supercritical helium temperature , Temperature sensors , Weak signal measurement