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Error characterization and calibration of real-time magnetic field measurement systems
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment ( IF 1.4 ) Pub Date : 2020-12-26 , DOI: 10.1016/j.nima.2020.164979
Christian Grech , Maria Amodeo , Anthony Beaumont , Marco Buzio , Vincenzo Di Capua , David Giloteaux , Nicholas Sammut , Joseph Vella Wallbank

In synchrotrons at the European Organization for Nuclear Research (CERN), magnetic measurement systems known as B-trains measure the magnetic field in the main bending magnets in real-time, and transmit this signal for the control of the synchrotron’s RF accelerating cavities, magnet power converter and beam monitoring systems. This work presents an assessment of the capabilities and performance of the new FIRESTORM (Field In REal-time STreaming from Online Reference Magnets) system as part of the first phase of commissioning. A short summary of the architecture of the measurement system is provided first, followed by the definition of an error model which can be used to characterize random and systematic errors separately. We present a procedure for the metrological calibration and qualification of the B-trains, including an experimental evaluation of the different error sources for the four new systems being commissioned in the Proton Synchrotron Booster (PSB), Low Energy Ion Ring (LEIR), Proton Synchrotron (PS) and the Extra Low ENergy Antiproton (ELENA) ring. In particular, we discuss a method to calibrate systematic gain and offset errors based on the RF cavity frequency offset needed to center the beam on its theoretical orbit.



中文翻译:

实时磁场测量系统的误差表征和校准

在欧洲核研究组织(CERN)的同步加速器中,被称为B列的磁测量系统实时测量主弯曲磁体中的磁场,并传输该信号以控制同步加速器的RF加速腔,磁体功率转换器和光束监控系统。这项工作是对新FIRESTORM(在线参考磁体的实时重播现场)系统的功能和性能的评估,这是调试第一阶段的一部分。首先提供了测量系统架构的简短摘要,然后给出了误差模型的定义,该模型可用于分别表征随机误差和系统误差。我们介绍了B列火车的计量校准和鉴定程序,包括对在质子同步加速器(PSB),低能离子环(LEIR),质子同步加速器(PS)和超低能量反质子(ELENA)环中调试的四个新系统的不同误差源的实验评估。尤其是,我们讨论了一种基于将光束置于其理论轨道中心所需的RF腔频率偏移来校准系统增益和偏移误差的方法。

更新日期:2021-01-02
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