原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2014年
3期
541-544
,共4页
杨永良%程超才%孙葆根%马天骥%卢平%邹俊颖
楊永良%程超纔%孫葆根%馬天驥%盧平%鄒俊穎
양영량%정초재%손보근%마천기%로평%추준영
钮扣电极%束流位置检测器%BPM标定%对数比处理%灵敏度%mapping图
鈕釦電極%束流位置檢測器%BPM標定%對數比處理%靈敏度%mapping圖
뉴구전겁%속류위치검측기%BPM표정%대수비처리%령민도%mapping도
button pickup%beam position monitor%BPM calibration%log-ratio processing%sensitivity%mapping diagram
为满足合肥光源重大维修改造项目对储存环束流位置测量的高精度要求,对钮扣束流位置检测器(BPM )电极进行了重新设计,本文对新设计的BPM进行特征阻抗、分布电容和标定系数等参数离线标定。采用时域反射计(TDR)测量其阻抗特性和分布电容,测量结果表明,50Ω标准阻抗测试电缆与BPM Feedthrough连接处的阻抗一致性较好,说明其特性符合设计的50Ω阻抗,计算得到分布电容约为2.9 pF ,满足设计要求。通过天线法进行标定,分别采用差比和法与对数比法得到直观的mapping图,计算得到BPM的水平和垂直方向的灵敏度,差比和法与对数比法获得的灵敏度相对偏差在垂直方向小于0.5%,水平方向小于2.8%,离线标定获得的各项参数均满足要求。
為滿足閤肥光源重大維脩改造項目對儲存環束流位置測量的高精度要求,對鈕釦束流位置檢測器(BPM )電極進行瞭重新設計,本文對新設計的BPM進行特徵阻抗、分佈電容和標定繫數等參數離線標定。採用時域反射計(TDR)測量其阻抗特性和分佈電容,測量結果錶明,50Ω標準阻抗測試電纜與BPM Feedthrough連接處的阻抗一緻性較好,說明其特性符閤設計的50Ω阻抗,計算得到分佈電容約為2.9 pF ,滿足設計要求。通過天線法進行標定,分彆採用差比和法與對數比法得到直觀的mapping圖,計算得到BPM的水平和垂直方嚮的靈敏度,差比和法與對數比法穫得的靈敏度相對偏差在垂直方嚮小于0.5%,水平方嚮小于2.8%,離線標定穫得的各項參數均滿足要求。
위만족합비광원중대유수개조항목대저존배속류위치측량적고정도요구,대뉴구속류위치검측기(BPM )전겁진행료중신설계,본문대신설계적BPM진행특정조항、분포전용화표정계수등삼수리선표정。채용시역반사계(TDR)측량기조항특성화분포전용,측량결과표명,50Ω표준조항측시전람여BPM Feedthrough련접처적조항일치성교호,설명기특성부합설계적50Ω조항,계산득도분포전용약위2.9 pF ,만족설계요구。통과천선법진행표정,분별채용차비화법여대수비법득도직관적mapping도,계산득도BPM적수평화수직방향적령민도,차비화법여대수비법획득적령민도상대편차재수직방향소우0.5%,수평방향소우2.8%,리선표정획득적각항삼수균만족요구。
According to the high precision requirements of the Hefei Light Source major maintenance and reconstruction project , a new button type beam position monitor (BPM) was designed for HLS Ⅱ electron storage ring .The characteristic impedance and distributed capacitance of button pickup were measured by time-domain reflectometer (TDR) ,and scaling coefficient of the new BPM was determined through antenna method .The TDR test results show that the impedance of pickup is 50 Ω which matches the cable impedance ,and the capacitance is about 2.9 pF w hich meets design requirements . Furthermore , the intuitive mapping diagram and calibration factor of beam position were obtained by antenna scanning .Compared with the design value ,the sensitivity deviation of new BPM is less than 0.5% in the vertical direction and less than 2.8% in the horizontal direction .