Cooling means for cooling a superconductor, the magnetic resonance device, superconducting machine and method for conveying and / or circulating cooling medium for cooling a superconductor

Cooling means (8, 25) for cooling a superconductor, wherein the superconductor and / or the superconductor bearing member into contact with a liquid cooling medium (10, 27) is engageable, characterized in that the cooling device (8, 25) to promote the the cooling medium (10, 27) to the superconductor and / or for circulating the cooling medium (10, 27) arranged in a bath for the superconductor one in a conveyor line (18, 38) bladder pump (20, 36).