Mitsubishi Heavy Industries Limited

Sadao Miura

Daisuke Suzuki

Yuichiro Kamino

Kazuhiro Tsukuda

The present invention provides an accelerating structure capable of increasing a degree of vacuum at a middle part inside the accelerating structure while confining an alternating electric field to the inside. An accelerating structureis formed of a plurality of annular discsandserially connected into a cylindrical shape. At least one of the discsdisposed at a middle part of the accelerating structureincludes: a choke structure formed by a choke filter; and a vacuum portopened in an outer circumferential surface of the disc on an outer circumferential side radially outward from the choke structure, and the vacuum portis connected to an external exhaust device.

Accelerating structure

An HF frequency tuning device includes a resonance cavity in which an HF is introduced, a phase detecting section which generates a sign data representing a sign of a phase difference between a traveling wave and a reflected wave included in the HF in the resonance cavity. The frequency of the HF is repeatedly shifted by a first pitch. The direction of the shift is determined by the sign data for reducing the phase difference. When the sign is inverted, the frequency of the HF is repeatedly shifted to the opposite direction by a second pitch smaller than the first pitch until the sign is inverted again. By this tuning process, the fine tuning of HF can by achieved in a short time.

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Tokyo, Japan

Sadao Miura