PROBLEM TO BE SOLVED: To provide a cooling system and a magnetoencephalogram having good cooling efficiency by reducing invasion of heat to a connecting portion for carrying a refrigerant.SOLUTION: The cooling system is provided with a container 1 for storing an SQUID sensor and a refrigerant for cooling the SQUID sensor, a refrigerant condensation part, a thermal radiation shield part, a magnetic shield part, a condensation refrigerator, a magnetic shield refrigerator, a condensation refrigerant supply passage 8a, a condensation refrigerant return passage 9a, a magnetic shield refrigerant supply passage 10a, a magnetic shield refrigerant return passage 11a and an outer shell pipe 20. Three passages of the condensation refrigerant supply passage 8a, the condensation refrigerant return passage 9a, the magnetic shield refrigerant supply passage 10a and the magnetic shield refrigerant return passage 11a are surrounded by a heat insulating space 50 provided inside an inner pipe 11s, respectively, and the other one passage other than the three passages forms a passage surrounding the heat insulating space 50 and having an annular cross section. A space between the other one passage and the outer shell pipe 20 is a vacuum region 60.COPYRIGHT: (C)2009,JPO&INPIT【課題】冷媒を搬送する接続部分への熱の侵入を低減することで、冷却効率の良い冷却システム及び脳磁計を提供する。【解決手段】冷却システムは、SQUIDセンサ及びSQUIDセンサを冷却する寒剤を収納する容器1、寒剤凝縮部、熱輻射シールド部、磁気シールド部、凝縮用冷凍機、磁気シールド用冷凍機、凝縮用冷媒供給路8a、凝縮用冷媒返送路9a、磁気シールド用冷媒供給路10a、磁気シールド用冷媒返送路11a、及び外殻管20を備え、凝縮用冷媒供給路8a、凝縮用冷媒返送路9a、磁気シールド用冷媒供給路10a、及び磁気シールド用冷媒返送路11aのうちの3つの流路は、内管11sの内側に設けられている断熱空間50にそれぞれが囲まれており、3つの流路以外の他の1つの流路は、断熱空間50を囲む断面環状の流路をなし、他の1つの流路と外殻管20との間は真空領域60である。【選択図】図2
