Houghton C, Bloomer C, Bobb L
Diamond Light Source Ltd, Diamond House Harwell Science and Innovation Campus, Oxfordshire OX11 0DE, United Kingdom.
J Synchrotron Radiat. 2023 Sep 1;30(Pt 5):876-884. doi: 10.1107/S1600577523005623. Epub 2023 Jul 18.
Single-crystal chemical vapour deposition (CVD) diamond detectors are an established transmissive synchrotron beamline diagnostic instrument used for beam position and beam intensity monitoring. A recently commercialized alternative is silicon carbide (4H-SiC) devices. These have the potential to provide the same diagnostic information as commercially available single-crystal CVD diamond X-ray beam position monitors, but with a much larger transmissive aperture. At Diamond Light Source an experimental comparison of the performance of single-crystal CVD diamond and 4H-SiC X-ray beam position monitors has been carried out. A quantitative comparison of their performance is presented in this paper. The single-crystal diamond and 4H-SiC beam position monitors were installed in-line along the synchrotron X-ray beam path enabling synchronous measurements at kilohertz rates of the beam motion from both devices. The results of several tests of the two position monitors' performance are presented: comparing signal uniformity across the surface of the detectors, comparing kHz intensity measurements, and comparing kHz beam position measurements from the detectors. Each test is performed with a range of applied external bias voltages. A discussion of the benefits and limitations of 4H-SiC and single-crystal CVD diamond detectors is included.
单晶化学气相沉积（CVD）金刚石探测器是一种成熟的透射式同步加速器光束线诊断仪器，用于光束位置和光束强度监测。最近商业化的一种替代产品是碳化硅（4H-SiC）器件。这些器件有可能提供与市售单晶CVD金刚石X射线光束位置监测器相同的诊断信息，但透射孔径要大得多。在钻石光源中心，已经对单晶CVD金刚石和4H-SiC X射线光束位置监测器的性能进行了实验比较。本文给出了它们性能的定量比较结果。单晶金刚石和4H-SiC光束位置监测器沿同步加速器X射线束路径串联安装，能够以千赫兹速率对两个器件的光束运动进行同步测量。给出了两种位置监测器性能的几项测试结果：比较探测器表面的信号均匀性、比较千赫兹强度测量结果以及比较探测器的千赫兹光束位置测量结果。每项测试都在一系列施加的外部偏置电压下进行。文中还讨论了4H-SiC和单晶CVD金刚石探测器的优缺点。
