CVD diamond-based semi-transparent beam-position monitors for synchrotron beamlines: preliminary studies and device developments at CEA/Saclay.
CVD diamond-based semi-transparent beam-position monitors for synchrotron beamlines: preliminary studies and device developments at CEA/Saclay.
复制标题
用于同步加速器光束线的基于 CVD 金刚石的半透明光束位置监视器：CEA/Saclay 的初步研究和设备开发。
DOI：
10.1107/s0909049505032097
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发表时间：
2006
影响因子：
2.5
通讯作者：
C. Mer
中科院分区：
文献类型：
--
作者：
P. Bergonzo;D. Tromson;C. Mer
利用化学气相沉积（CVD）技术合成的多晶金刚石可用于制作同步加速器光束线中x射线的新型光电探测器。由于金刚石对低能量光子的吸收较低，因此这种装置可以在光子能量低至2 keV至15-20 keV的情况下进行光束位置监测，并且光束衰减很小。这里展示了如何将金刚石基器件简单地加工成电离室，用于具有高位置分辨率（<2微米）的先进半透明位置监测。使用相同原理的其他配置也可以启用内联字段分析。它还显示了这些器件在性能，信噪比和可靠性方面的期望，以及由多晶材料中存在缺陷引起的固有局限性。特别是，由于猝灭输运特性，载流子寿命极低的金刚石器件也可能对同步加速器光的时间结构的表征特别感兴趣。对这些设备的兴趣在于永久插入光束线和承受高水平的辐射，以进行连续的光束监测。
Polycrystalline diamond synthesized using the chemical vapour deposition (CVD) technique can be used to fabricate new types of photodetectors for the characterization of X-ray light in synchrotron beamlines. Since diamond exhibits a low absorption to low-energy photons, such devices allow beam-position monitoring with very little beam attenuation at photon energies as low as 2 keV up to 15-20 keV. Here it is shown how diamond-based devices can simply be processed as ionization chambers for advanced semi-transparent position monitoring with high position resolution (<2 microm). Other configurations using the same principle can also enable in-line field profiling. It is also shown what can be expected from these devices in terms of performances, signal-to-noise ratios and reliability, together with their inherent limitations caused by the presence of defects in polycrystalline materials. In particular, diamond devices with extremely low carrier lifetimes, owing to quenched transport properties, could also be of particular interest for the characterization of the temporal structure of synchrotron light. Interest in these devices lies in the permanent insertion into beamlines and withstanding high levels of radiation for continuous beam monitoring.