Hitachi, Ltd.

Hitachi High-tech Corporation

Takamitsu Hae

Kazuo Hiramoto

Takayoshi Seki

Takamichi Aoki

Fumiaki Noda

Kazuyoshi Saitou

Masahiro Ikeda

Kenji Tsuchiya

Ayumu Morita

Masato Yabu

Chishin Hori

Akio Nakazawa

An object of the present invention is to speed up an operation of extracting an ion beam from an accelerator. An acceleratorincludes an upper magnetic poleand a lower magnetic polesandwiching an ion circulation spacein which ions circulate. At least one of the upper magnetic poleand the lower magnetic poleis formed such that a magnetic pole interval between the upper magnetic poleand the lower magnetic polevaries when the ion circulation spaceis viewed along an ion beam trajectory. That is, a wide interval regionhaving a larger magnetic pole interval than a peripheral region is formed in a region closer to a center point of the ion circulation spacethan a center point of the ion beam trajectory.

Accelerator and particle therapy system

A rotating capacitor is used in a circular accelerator that accelerates a charged particle beam by feeding a first radio frequency to a DC main magnetic field. The rotating capacitor modulates a frequency of the first radio frequency. The rotating capacitor includes a stator electrode and a rotor electrode used for modulating the frequency of the first radio frequency together with the stator electrode. A vacuum seal performs vacuum sealing around a shaft for rotating the rotor electrode. A bearing that supports the shaft is installed on an atmosphere side.

Rotating capacitor, circular accelerator, and particle therapy system

In a circular accelerator that applies a radiofrequency wave in a main magnetic field to accelerate charged particle beam while increasing an orbit radius, another radiofrequency wave with a frequency different from the radiofrequency wave used for acceleration is applied to the charged particle beam in order to extract the charged particle beam. Thereby, in the circular accelerator that accelerates charged particle beam while increasing an orbit radius by applying a radiofrequency wave in a main magnetic field, the high precision control on extraction of the charged particle beam from the circular accelerator is achieved.

Circular accelerator, particle therapy system with circular accelerator, and method of operating circular accelerator

An actuator for a contactor comprises an electromagnet having a closing coil, a holding coil, fixed cores wound with the closing coil and the holding coil respectively, a movable core provided on one side of the fixed cores, and a yoke. A main contact movable member operates to perform closing or interrupting by attraction or release of the movable core with respect to the fixed core. The actuator has a trip spring, energy-stored during the closing, that performs the interrupting upon stopping energization to the holding coil and thereby releasing the stored-energy. The actuator has an auxiliary contact operating with the operation of the movable core and performing energization switching with respect to the closing coil and the holding coil. The trip spring is provided on one side of the electromagnet in a horizontal direction while the auxiliary contact is provided on the other side.

Actuator for contactor

Growing community of inventors

Tokyo, Japan

Takamitsu Hae