用快速非致冷IR探测器在DAFNE上进行束流诊断
Beam diagnostics at DAFNE with fast uncooled IR detectors
摘要：
束团纵向诊断是现代加速器的关键问题。面对这一挑战性的需求，中红外紧凑型非制冷光电导碲镉汞探测器的测试最近已在DAFNE进行。使用不同的设备来监测电子束团的发射。第一个实验允许记录2.7ns长的e-聚束，其具有约600 ps的单个脉冲的FWHM。这些结果解决的可能性，以改善诊断DAFNE和为此目的的出口端口上的正电子环的偏转磁铁已成立。一个高压室，托管一个镀金的平面镜，收集和偏转辐射通过ZnSe窗口，是这个端口的前端。在窗口之后，空气中的简单光学布局允许将红外辐射聚焦在不同的探测器上。该仪器将允许在两个环之间的sub-ns时域中进行比较，并识别和表征聚束不稳定性。此外，为了提高性能的新的光伏探测器与亚纳秒响应时间的测试正在进行中。我们将简要总结3+L实验的实际状况，并将讨论未来的应用快速红外光伏探测器和快速红外阵列探测器的发展。
英文摘要：
Bunch-by-bunch longitudinal diagnostics is a key issue of modern accelerators. To face up this challenging demand, tests of mid-IR compact uncooled photoconductive HgCdTe detectors have been recently performed at DAFNE. Different devices were used to monitor the emission of e- bunches. The first experiments allowed recording of 2.7 ns long e- bunches with a FWHM of a single pulse of about 600 ps. These results address the possibility to improve diagnostics at DAFNE and to this purpose an exit port on a bending magnet of the positron ring has been set-up. An HV chamber, hosting a gold-coated plane mirror that collects and deflects the radiation through a ZnSe window, is the front-end of this port. After the window, a simple optical layout in air allows focusing IR radiation on different detectors. The instrumentation will allow comparison in the sub-ns time domain between the two rings and to identify and characterize bunch instabilities. Moreover, to improve performances tests of new photovoltaic detectors with sub-ns response times are in progress. We will briefly summarize the actual status of the 3+L experiment and will discuss future applications of fast IR photovoltaic detectors and the development of fast IR array detectors.
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