Low-<em> T</em><sub>c</sub> direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

Low- T_c direct current superconducting quantum interference device magnetometer-based 36-channel magnetocardiography system in a magnetically shielded room

Qiu Yang^a),^b),^c), Li Hua^a),^b),^c), Zhang Shu-Lin^a),^b), Wang Yong-Liang^a),^b), Kong Xiang-Yan†^a),^b), Zhang Chao-Xiang^a),^b), Zhang Yong-Sheng^a),^b), Xu Xiao-Feng^a),^b), Yang Kang^a),^b),^c), Xie Xiao-Ming^a),^b)

(a) Schematic diagram of voltage-biased SQUID connecting to a current-to-voltage convertor. Here, V _b is the bias voltage. (b) The photo of a 4-channel FLL electronics. (c) The photo of 64-channel SQUID readout controller.