Sumitomo Heavy Industries, Ltd.

Yuta Ebara

Takaaki Morie

Jyun Yoshida

Yukio Mikami

Nobuaki Takahasi

In a case where a start current value is higher than a target current value, a control unit performs a control to lower a current value from the start current value to the target current value. In addition, in a case where the start current value is equal to or lower than the target current value, the control unit controls to raise the current value from the start current value to the format current value higher than the target current value, and then lower the current value to the target current value. In this manner, regardless of the value of the predetermined current value before the current value is changed, the current value reaches the target current value in a descending manner. As a result, the coil magnetization magnetic field when the target current value is reached can be kept in the same state.

Superconductive electromagnet, particle accelerator, and particle beam therapy apparatus

There is provided a superconducting magnet device including a superconducting coil, a vacuum vessel that accommodates the superconducting coil, a current lead that is connected to the superconducting coil and installed in the vacuum vessel, a power supply cable that is disposed outside the vacuum vessel and connected to the current lead, and a heating unit that is disposed apart from the current lead and heats the current lead via the power supply cable.

Superconducting magnet device

A cryogenic cooling system includes a gas circulation source; a cryocooler including a cryocooler stage that cools the cooling gas; an object-to-be-cooled gas flow path; a gas supply line that supplies a cooling gas from the gas circulation source via the cryocooler stage to the object-to-be-cooled gas flow path; a gas recovery line that recovers the cooling gas from the object-to-be-cooled gas flow path to the gas circulation source; at least one temperature sensor installed at a measurement location away from the object-to-be-cooled gas flow path along the gas supply line and/or a measurement location installed away from the object-to-be-cooled gas flow path along the gas recovery line; and a gas flow rate control unit that controls the gas circulation source to adjust a flow rate of the cooling gas flowing through the object-to-be-cooled gas flow path in accordance with a measured temperature at at least one measurement location.

Cryogenic cooling system

A cryogenic cooling system includes a gas circulation source; a cryocooler that cools a cooling gas; a cooling gas flow path that causes a cooling gas to flow from the gas circulation source to the object to be cooled; and a control device that controls the gas circulation source so as to execute initial cooling of the object to be cooled according to a prescribed flow rate pattern. The prescribed flow rate pattern is predetermined such that the cooling gas flows through the cooling gas flow path at a first average flow rate, and the cooling gas flows through the cooling gas flow path at a second average flow rate. The second average flow rate is smaller than the first average flow rate such that the cooling capacity of the cryogenic cooling system is increased.

A magnetic field measuring device that measures a magnetic field distribution of a cyclotron, the magnetic field measuring device including a measurement unit that is disposed between a pair of magnetic poles of the cyclotron and measures the magnetic field distribution and a cable that is connected to the measurement unit, in which the cable reaches a side wall of the cyclotron from a center portion of the cyclotron by passing between the pair of magnetic poles.

Magnetic field measuring device, manufacturing method of cyclotron, and cyclotron

A superconducting magnet device includes compressor that compresses a refrigerant gas; a refrigerator that expands the refrigerant gas to generate coldness; a superconducting coil cooled by the refrigerator; a vacuum chamber that houses the superconducting coil; an electrode for a coil that is connected to the superconducting coil and disposed in the outside of the vacuum chamber; a heater that heats the electrode for a coil; a power supply line that connects the compressor and the refrigerator to each other and supplies electrical power from the compressor to the refrigerator; and a branch line that is branched from the power supply line to supply electrical power to the heater.

Growing community of inventors

Kanagawa, Japan

Yuta Ebara