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Method forin situandin operandocavity loadedQextraction in superconducting rf accelerators
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 2021-03-19 , DOI: 10.1103/physrevaccelbeams.24.032001 Frank Marhauser
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 2021-03-19 , DOI: 10.1103/physrevaccelbeams.24.032001 Frank Marhauser
A novel method has been developed that allows extracting the loaded quality factor of particle accelerating radio-frequency cavities at any time during beam operation from acquired control system process parameters without the need of additional measurement equipment. Concurrently it assesses the attenuation in a cavities’ power transmission line for any rf generator to rf cavity mismatch condition, and thus can correct calibration inaccuracies of measured forward and reflected power levels. The mathematical formalism is described. It is specifically derived for cryogenically cooled superconducting cavities for which the loaded quality factor can be equated with the external quality factor of the input power coupler. The described method has been applied for 418 superconducting cavities in operation at the Continuous Electron Beam Accelerator Facility at the Thomas Jefferson National Accelerator Facility. The validation of the method as well as its beneficial use as a diagnostic tool is demonstrated for a finite number of examples utilizing process variables archived during a period in the past when the linac beam current was ramped up multiple times. The method is in the process of being implemented in the machines’ control system for an in situ and in operando evaluation of the power coupler’s external quality factor.
中文翻译:
超导射频加速器中载有西地丁可操作性Q萃取的方法
已经开发出一种新颖的方法,该方法允许在束操作期间的任何时间从获取的控制系统过程参数中提取粒子加速射频腔的负载品质因数,而无需额外的测量设备。同时,它针对任何射频发生器到射频腔不匹配的情况评估腔的功率传输线中的衰减,从而可以校正测得的正向和反射功率水平的校准误差。描述了数学形式主义。它专门针对低温冷却的超导腔而派生,其负载品质因数可以等于输入功率耦合器的外部品质因数。所描述的方法已应用于托马斯·杰斐逊国家加速器工厂的连续电子束加速器工厂中运行的418个超导腔。在有限数量的示例中证明了该方法的有效性及其作为诊断工具的有益用途,这些示例利用了过去直线加速器束电流多次升高期间存储的过程变量。该方法正在机器的控制系统中实现对功率耦合器的外部品质因数进行就地和操作评估。
更新日期:2021-03-21
中文翻译:
超导射频加速器中载有西地丁可操作性Q萃取的方法
已经开发出一种新颖的方法,该方法允许在束操作期间的任何时间从获取的控制系统过程参数中提取粒子加速射频腔的负载品质因数,而无需额外的测量设备。同时,它针对任何射频发生器到射频腔不匹配的情况评估腔的功率传输线中的衰减,从而可以校正测得的正向和反射功率水平的校准误差。描述了数学形式主义。它专门针对低温冷却的超导腔而派生,其负载品质因数可以等于输入功率耦合器的外部品质因数。所描述的方法已应用于托马斯·杰斐逊国家加速器工厂的连续电子束加速器工厂中运行的418个超导腔。在有限数量的示例中证明了该方法的有效性及其作为诊断工具的有益用途,这些示例利用了过去直线加速器束电流多次升高期间存储的过程变量。该方法正在机器的控制系统中实现对功率耦合器的外部品质因数进行就地和操作评估。