APS : Final implementation, commissioning, and performance of embedded collimator beam position monitors in the Large Hadron Collider
APS : Final implementation, commissioning, and performance of embedded collimator beam position monitors in the Large Hadron Collider
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APS：大型强子对撞机中嵌入式准直器光束位置监视器的最终实施、调试和性能
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Wenninger
中科院分区：
文献类型：
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作者：
G. Valentino;G. Baud;R. Bruce;M. Gasior;A. Mereghetti;D. Mirarchi;J. Olexa;S. Redaelli;B. Salvachua;A. Valloni;J. Wenninger
在长时间停机期间，18台大型强子对撞机（LHC）的准直器被替换为一种新的设计，在准直器钳口中嵌入了光束位置监视器（BPM）拾取按钮。bpm提供了准直器上光束轨道的直接测量，因此可以比使用依赖于光束损耗反馈的标准技术更快地对准准直器。在线轨道测量还允许减少专为满足未知轨道漂移而设置的准直层次结构的操作余量，从而降低β并增加LHC的亮度范围。本文介绍了嵌入式bpm在大型强子对撞机中的调试结果。综述了数据采集和控制软件体系结构。提供了与标准对准技术的比较，以及在不同机器模式下对测量轨道的填充分析，这也将用于确定更严格的准直层次结构的合适的光束联锁。
During Long Shutdown 1, 18 Large Hadron Collider (LHC) collimators were replaced with a new design, in which beam position monitor (BPM) pick-up buttons are embedded in the collimator jaws. The BPMs provide a direct measurement of the beam orbit at the collimators, and therefore can be used to align the collimators more quickly than using the standard technique which relies on feedback from beam losses. Online orbit measurements also allow for reducing operational margins in the collimation hierarchy placed specifically to cater for unknown orbit drifts, therefore decreasing the β and increasing the luminosity reach of the LHC. In this paper, the results from the commissioning of the embedded BPMs in the LHC are presented. The data acquisition and control software architectures are reviewed. A comparison with the standard alignment technique is provided, together with a fill-to-fill analysis of the measured orbit in different machine modes, which will also be used to determine suitable beam interlocks for a tighter collimation hierarchy.