| 摘要 |
PURPOSE:To obtain a current detector with a higher S/N ratio, by connecting signals from four current detectors arranged along a beam duct to a voltage detector to extract a fine signal current alone due to an charged particle from detection signals thereof. CONSTITUTION:A sensor section is made up of four magnetic cores 2 wound with a coil and a metallic case 5. Voltage detectors 40 are arranged at an equal interval at the tip of a signal transmission line 70 to be connected separately to an arithmetic device 50. Signals V1, V2, V3 and V4 of the detectors undergoes an arithmetic processing by a specified equation and a fine current signal due to a charged particle is extracted to be shown on a current display device 60. This enables detection with a high S/N ratio against a large noise signal caused by a high frequency electromagnetic field.
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