Determining beam transverse absolute position by triangulation of multi-electrode signal phase differences  

作　　者：Xing Yang Hong‑Shuang Wang Yi‑Mei Zhou Yong‑Bin Leng 

机构地区：[1]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China [4]University of Science and Technology of China,Hefei 230026,China

出　　处：《Nuclear Science and Techniques》2024年第8期38-47,共10页核技术（英文）

基　　金：supported by the National Key R&D Program of China(No.2022YFA1602201)。

摘　　要：Accurate measurement of the transverse position of a beam is crucial in particle accelerators because it plays a key role in determining the beam parameters.Existing methods for beam-position measurement rely on the detection of image currents induced on electrodes or narrow-band wake field induced by a beam passing through a cavity-type structure.However,these methods have limitations.The indirect measurement of multiple parameters is computationally complex,requiring external calibration to determine the system parameters in advance.Furthermore,the utilization of the beam signal information is incomplete.Hence,this study proposes a novel method for measuring the absolute electron beam transverse position.By utilizing the geometric relationship between the center position of the measured electron beam and multiple detection electrodes and by analyzing the differences in the arrival times of the beam signals detected by these electrodes,the absolute transverse position of the electron beam crossing the electrode plane can be calculated.This method features absolute position measurement,a position sensitivity coefficient independent of vacuum chamber apertures,and no requirement for a symmetrical detector electrode layout.The feasibility of this method is validated through numerical simulations and beam experiments.

关 键 词：Electron beam bunch-by bunch diagnostics Bunch position measurement Triangulation method Bunch phase Bunch-by-bunch Transverse position Pickup signal 

分 类 号：TL50[核科学技术—核技术及应用]