Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques


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
  • Supported by:

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

PDF ShareIt Export Citation
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


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