电子注入器中基于条带检测器的多束流参数测量技术研究及应用
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摘要
作为合肥光源电子注入器的电子直线加速器和输运线,其束流运行的状态直接影响储存环电子注入的效率,从而对合肥光源储存环束流的运行和同步辐射光的品质具有重要的影响。为了能够在不影响注入的情况下,实时的测量实际注入储存环的束流的位置、发射度、流强和能散等参数,提出了基于条带检测器的注入器非拦截多参数束流测量技术的研究计划,为合肥光源直线加速器和输运线以及升级改造后的合肥光源注入器设计一系列基于条带检测器的束流位置、束流流强、束流发射度和束流能散的测量系统,成为合肥光源为用户提供高稳定高品质同步光的重要诊断装置。
本文首先分析了利用条带检测器进行直线加速器束流位置测量、流强测量、发射度测量和能散测量的原理和方法,详细推导了利用条带束流位置检测器(BPM)和八电极束流能散检测器(BESM)的感应信号进行位置测量和提取σx2-σy2分量的差比和和对数比两种不同方法的一系列公式。同时分析了全新设计的四轴对称八电极BESM的优点与特性。
针对合肥光源重大维修改造工程的计划和要求,详细介绍了条带BPM和八电极BESM的物理结构的设计和电极张角、半径和长度等物理参数的确定,以及电极耦合分析、分辨率等相关性能的计算。
基于两套不同的信号获取处理系统,研制了两套离线标定系统,采用天线法分别对短条带BPM样机和试验型八电极BESM进行了标定实验,得到了电位置、四极分量、和信号等相关的拟合公式,减少了将来在线束流位置、流强、发射度和能散测量的误差。同时对购买的单次通过数字束流位置处理器Libera Brilliance Single Pass进行了相关的验收测试。
利用目前合肥光源直线加速器和输运线上已有的条带BPM、束流变压器、四极铁等设备和Libera Brilliance Single Pass,完成了基于条带检测器的束流位置测量系统、流强测量系统和发射度测量系统的搭建,并进行了相关在线测量实验,得到了束流位置、流强、发射度的测量结果。最后介绍了HLS升级改造后的注入器基于条带检测器的多束流参数测量系统的设计情况。
本课题由国家自然科学基金项目(10875117,11175173)支持。
The state of the beam running in the Linac and transport lines which is the injector of Hefei Light Source, has direct impact on the injection efficiency of the storage ring, and thus has an important impact on the beam operation of HLS storage ring and the quality of the synchrotron radiation light. To achieve the realtime measurement of the beam position, beam current, beam emittance and beam energy spread of the injecting beam of the storage ring with no affect the injection, a project to develop non-intercepting mult-parameters measurement of the injector beam based on stripline monitor has been worked on. The beam position measurement system, beam current measurement system, beam emittance measurement system and beam energy spread measurement system based on stripline monitor for the HLS Linac and transport lines and the HLS injector after be upgraded is desighed, which will be the important diagnostic device to provide high stability and high-quality synchrotron radiation light for HLS users.
Firstly, the principles and methods of beam position measurement, beam current measurement, beam emittance measurement and beam energy spread measurement based on stripline monitor for Linac is analyzed, the formulas of position measurement and pick up σx2-σy2component through the induced signal of the stripline Beam Position Monitor and the eight-striplines Beam Energy Spread Monitor at both the difference/sum ratio (△/Σ) method and the log-ratio method are calculated. The advantages and features of the newly designed four-axis symmetry eight-striplines BESM are analyzed also.
Accord to the plans and requirements of the HLS great repair upgrade project, the physical structure and the electrode's angle, radius, length and other physical parameters of the stripline BPM and the eight-striplines BESM are designed, the coupling between electrodes and the resolution are calculated.
Two off-line calibration system based on two different signal acquisition and processing system are developed. The short stripline BPM and the experimental eight-striplines BESM are calibrated by antenna method, and the fitting formulas of position, quadrupole component, sum signal and other parameters are got, which will reduce the measurement error of online beam position, beam current, beam emittance and beam energy spread in the future. The acceptance test of all the single-pass digital beam position processor Libera Brilliance Single Pass bought form IT company have been done after be received.
With the stripline BPM, current transformer, quadrupole magnet and other equipments at HLS Linac and transport and Libera Brilliance Single Pass, the beam position measurement system, current measurement system and emittance measurement system are finished, the online measurement experiments are done, and the measurement results of beam position, beam current and beam emittance are got. At last the design of beam mult-parameters measurement system based on stripline monitor for HLS injector after be upgraded are introduced.
Investigation of this subject is supported by National Natural Science Foundation project10875117and11175173.
本文首先分析了利用条带检测器进行直线加速器束流位置测量、流强测量、发射度测量和能散测量的原理和方法,详细推导了利用条带束流位置检测器(BPM)和八电极束流能散检测器(BESM)的感应信号进行位置测量和提取σx2-σy2分量的差比和和对数比两种不同方法的一系列公式。同时分析了全新设计的四轴对称八电极BESM的优点与特性。
针对合肥光源重大维修改造工程的计划和要求,详细介绍了条带BPM和八电极BESM的物理结构的设计和电极张角、半径和长度等物理参数的确定,以及电极耦合分析、分辨率等相关性能的计算。
基于两套不同的信号获取处理系统,研制了两套离线标定系统,采用天线法分别对短条带BPM样机和试验型八电极BESM进行了标定实验,得到了电位置、四极分量、和信号等相关的拟合公式,减少了将来在线束流位置、流强、发射度和能散测量的误差。同时对购买的单次通过数字束流位置处理器Libera Brilliance Single Pass进行了相关的验收测试。
利用目前合肥光源直线加速器和输运线上已有的条带BPM、束流变压器、四极铁等设备和Libera Brilliance Single Pass,完成了基于条带检测器的束流位置测量系统、流强测量系统和发射度测量系统的搭建,并进行了相关在线测量实验,得到了束流位置、流强、发射度的测量结果。最后介绍了HLS升级改造后的注入器基于条带检测器的多束流参数测量系统的设计情况。
本课题由国家自然科学基金项目(10875117,11175173)支持。
The state of the beam running in the Linac and transport lines which is the injector of Hefei Light Source, has direct impact on the injection efficiency of the storage ring, and thus has an important impact on the beam operation of HLS storage ring and the quality of the synchrotron radiation light. To achieve the realtime measurement of the beam position, beam current, beam emittance and beam energy spread of the injecting beam of the storage ring with no affect the injection, a project to develop non-intercepting mult-parameters measurement of the injector beam based on stripline monitor has been worked on. The beam position measurement system, beam current measurement system, beam emittance measurement system and beam energy spread measurement system based on stripline monitor for the HLS Linac and transport lines and the HLS injector after be upgraded is desighed, which will be the important diagnostic device to provide high stability and high-quality synchrotron radiation light for HLS users.
Firstly, the principles and methods of beam position measurement, beam current measurement, beam emittance measurement and beam energy spread measurement based on stripline monitor for Linac is analyzed, the formulas of position measurement and pick up σx2-σy2component through the induced signal of the stripline Beam Position Monitor and the eight-striplines Beam Energy Spread Monitor at both the difference/sum ratio (△/Σ) method and the log-ratio method are calculated. The advantages and features of the newly designed four-axis symmetry eight-striplines BESM are analyzed also.
Accord to the plans and requirements of the HLS great repair upgrade project, the physical structure and the electrode's angle, radius, length and other physical parameters of the stripline BPM and the eight-striplines BESM are designed, the coupling between electrodes and the resolution are calculated.
Two off-line calibration system based on two different signal acquisition and processing system are developed. The short stripline BPM and the experimental eight-striplines BESM are calibrated by antenna method, and the fitting formulas of position, quadrupole component, sum signal and other parameters are got, which will reduce the measurement error of online beam position, beam current, beam emittance and beam energy spread in the future. The acceptance test of all the single-pass digital beam position processor Libera Brilliance Single Pass bought form IT company have been done after be received.
With the stripline BPM, current transformer, quadrupole magnet and other equipments at HLS Linac and transport and Libera Brilliance Single Pass, the beam position measurement system, current measurement system and emittance measurement system are finished, the online measurement experiments are done, and the measurement results of beam position, beam current and beam emittance are got. At last the design of beam mult-parameters measurement system based on stripline monitor for HLS injector after be upgraded are introduced.
Investigation of this subject is supported by National Natural Science Foundation project10875117and11175173.
引文
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