System for measuring beam position



<P>PROBLEM TO BE SOLVED: To provide a system for measuring beam position capable of acquiring uniform gains, without causing differences in the temperature among amplifiers, that for amplifying the right-side electrode signal and that for amplifying the left-side electrode signal. <P>SOLUTION: The system comprises an electrostatic beam position monitor 1, where at least two electrodes, a right side electrode 2 and a left side electrode 3, are provided in a vacuum vessel, a plurality of amplification circuits for separately amplifying the output voltage from the right-side electrode of the electrostatic beam position monitor and that from the left-side electrode, and a beam position signal processing circuit 6 that receives the outputs from the plurality of amplification circuits for calculating beam position. Each electrode of the electrostatic beam position monitor is constituted of electrode plates 7 insulated from each other and an earth plate 8, forming an electrostatic capacitance between the electrode plate and the earth plate. A variable capacitance capacitor 33 is connected in parallel to the electrostatic capacity. The electrostatic capacity of the variable capacitance capacitor is made changeable by the operation from the outside of the vacuum vessel. <P>COPYRIGHT: (C)2005,JPO&NCIPI
【課題】 右側電極信号増幅用と左側電極信号増幅用のアンプに温度差を生じさせず、均等な増幅率が得られるビーム位置測定システムを提供する。 【解決手段】 少なくとも右側電極2と左側電極3との二つの電極が真空容器内に設けられた静電型ビーム位置モニタ1、この静電型ビーム位置モニタの右側電極からの出力電圧と左側電極からの出力電圧とを個別に増幅する複数の増幅回路、この複数の増幅回路からの出力を受けてビーム位置を演算するビーム位置信号処理回路6を備え、前記静電型ビーム位置モニタの各電極が相互に絶縁された電極板7とアース板8とで構成され、この電極板とアース板との間に静電容量が形成されると共に、この静電容量に並列に可変容量コンデンサ33が接続され、この可変容量コンデンサの静電容量が、前記真空容器の外部からの操作により変更可能なように構成した。 【選択図】 図5




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    JP-2009036551-AFebruary 19, 2009Institute Of Physical & Chemical Research, 独立行政法人理化学研究所Ct monitor