1. A cryogenic system containing:! - capacity (22, 24, 26) for liquid helium containing liquid helium (LH); ! - superconducting windings (20) of a magnet immersed in liquid helium; ! - a condenser (30) for re-liquefying helium vapor with a smooth surface (50, 50 ', 50 ") of the capacitor, on which helium vapor is re-condensed and which is periodically interrupted by an interrupt structure (52, 52', 52"), causing leakage from the condenser for re-liquefaction of liquid helium, which condenses on a smooth surface, without moving along the entire vertical length of this capacitor for re-liquefaction on its smooth surface and / or violate the thickness of the film of liquid helium formed on the surface of the capacitor For re-liquefaction. ! 2. The cryogenic system according to claim 1, in which the interruption structure includes a rib (52) and / or groove (52 ', 52 ").! 3. The cryogenic system according to claim 2, in which a smooth surface (50, 50 ', 50 ") of the re-liquefaction condenser (30) is generally cylindrical and arranged vertically, and said rib (52) and / or groove (52', 52") extend around a circle around the generally cylindrical surface of the re-liquefaction condenser. ! 4. The cryogenic system according to claim 2, in which the surface (50, 50 ', 50 ") of the condenser for re-liquefaction, generally made cylin and is oriented vertically, said rib (52) and / or groove (52 ', 52 ") being made spiraling around said generally cylindrical surface of the condenser for re-liquefaction.! 5. The cryogenic system according to claim 1, wherein a design that causes liquid helium to leave the surface of the capacitor for re-liquefaction,
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