| 摘要 |
PURPOSE:To measure the center position of the particle beam inside a vacuum chamber in a particle accelerator such as a synchrotron. CONSTITUTION:A plurality of electrodes 40a-40e and 42a-42e are arranged in the circumferential direction at the same pitch d at upper and lower plane parts 44a and 44b, respectively, at the inside periphery of a vacuum chamber 22. The electromotive force occurring in each electrode 40a-40e and 42a-42e corresponds to the distance between them and an electron beam 34, so a beam position arithmetic circuit 48 compares the electromotive forces of the electrodes 40a-40e and 42a-42e (or 42a-42e) with each other, and seeks the position of the electrode, where the electromotive force at the peak can be gotten, as the center position in the horizontal direction of the electron beam 34. By narrowing the pitch and arranging the more electrodes, resolution can be improved.
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