Superconducting magnet system for cyclotron and cyclotron comprising ihe same

A superconducting magnet system for cyclotrons, comprising:

• a cryogenic device;
• a superconducting device;
• and
• a protecting module;
• wherein the cryogenic device comprises a refrigerating machine and a cryogenic container assembly;
• the cryogenic container assembly is filled with a cooling medium;
• the cryogenic container assembly comprises a first container end, a first connecting tube and a second container end;
• a magnet is provided at the first container end;
• the refrigerating machine is arranged at the second container end, and configured to cooling the cooling medium in the cryogenic container assembly;
• and the first container end is communicated with the second container end through the first connecting tube;
• the superconducting device comprises a superconducting coil;
• the superconducting coil is arranged in the first container end, and is immersed in the cooling medium in the first container end;
• and the cooling medium is a liquid cooling medium or a gaseous cooling medium;
• the protecting module is connected to the superconducting coil, and is configured to protect the superconducting coil when the superconducting device suffers a quench;
• the cryogenic container assembly comprises a Dewar, a cold shield and a liquid helium container nested in sequence from outside to inside;
• the Dewar, the cold shield and the liquid helium container are separated from each other;
• a first vacuum cavity is defined between an inner surface of the Dewar and an outer surface of the cold shield;
• a second vacuum cavity is defined between an inner surface of the cold shield and an outer surface of the liquid helium container;
• and the liquid helium container is filled with the cooling medium;
• the Dewar comprises a first Dewar portion, a second Dewar portion and a second connecting tube;
• the first Dewar portion is connected to the second Dewar portion through the second connecting tube;
• the cold shield comprises a first cold shield portion, a second cold shield portion and a third connecting tube;
• the first cold shield portion is connected to the second cold shield portion through the third connecting tube;
• the liquid helium container comprises a first liquid helium container portion, a second liquid helium container portion and a fourth connecting tube;
• and the first liquid helium container portion is connected to the second liquid helium container portion through the fourth connecting tube;
• the first liquid helium container portion is nestedly arranged inside the first cold shield portion, and the first cold shield portion is nestedly arranged inside the first Dewar portion;
• the first Dewar portion, the first cold shield portion and the first liquid helium container portion together form the second container end of the cryogenic container assembly;
• the second liquid helium container portion is nestedly arranged inside the second cold shield portion, and the second cold shield portion is nestedly arranged inside the second Dewar portion;
• and the second Dewar portion, the second cold shield portion and the second liquid helium container portion together form the first container end of the cryogenic container assembly;
• the refrigerating machine comprises a primary cold head and a heat exchange tube configured to perform heat exchange with the primary cold head;
• the heat exchange tube is filled with the cooling medium;
• and the primary cold head is configured to cool the third connecting tube and the second cold shield portion through the heat exchange tube and the cooling medium in the heat exchange tube.