Superconducting magnetic sensor having a cryostat for improved sensitivity of magnetic detection

A superconducting magnetic sensor for detecting an unknown magnetic field produced from an object, comprising:

• an adiabatic vessel having an outer wall and an inner wall separated from said outer wall by an evacuated space, said inner wall forming a depression for holding a cooling medium therein;
• a thermal insulation of a thermally insulating material, provided to fill said evacuated space for insulating thermally said inner wall and said outer wall from each other;
• a cooling member having a first end physically fixed upon said inner wall of said adiabatic vessel and extending toward said outer wall, said cooling member having a second, opposite end facing said outer wall with a separation therefrom;
• a superconducting pickup coil of a superconducting material for interlinking with an external magnetic flux, said superconducting pickup coil being provided in said evacuated space in physical contact with said cooling member so as to be cooled by said cooling medium via said cooling member;
• a superconducting magnetic detection unit provided in said depression so as to be immersed in said cooling medium, said superconducting magnetic detection unit detecting said external magnetic flux that has caused interlinking with said superconducting pickup coil upon cooling to a superconducting state by said cooling medium;
• and
• superconducting strip means of a superconducting material connecting said superconducting pickup coil and said superconducting magnetic detection unit, said superconducting strip means penetrating through said inner wall of said adiabatic vessel.