用于纳米束稳定的高分辨率、低延迟、逐束团反馈系统
A high-resolution, low-latency, bunch-by-bunch feedback system for nano-beam stabilization
摘要：
我们报告的设计，操作和性能的高分辨率，低延迟，一束一束的反馈系统的纳米束稳定。该系统采用了新颖的，超低品质因数的腔光束位置监测器（BPM），一个两级模拟信号下混频系统，和一个数字信号处理和反馈板，包括FPGA。FPGA固件允许在232 ns的测量延迟内对BPM波形的多达15个样本进行实时积分。我们表明，这种实时样品集成显着提高了光束位置的分辨率，因此，反馈性能。最好的实时光束位置分辨率是19 nm，据我们所知，这是在任何操作BPM系统中实现的最好的实时时间分辨率。反馈以两种互补模式运行，以稳定在KEK的ATF 2光束线的焦点处产生的超小光束的垂直位置。在单BPM反馈模式下，光束稳定到50 $\pm$ 5 nm。在双BPM反馈模式下，光束稳定到41 $\pm$ 4 nm。
英文摘要：
We report the design, operation and performance of a high-resolution, low-latency, bunch-by-bunch feedback system for nano-beam stabilisation. The system employs novel, ultra-low quality-factor cavity beam position monitors (BPMs), a two-stage analogue signal down-mixing system, and a digital signal processing and feedback board incorporating an FPGA. The FPGA firmware allows for the real-time integration of up to fifteen samples of the BPM waveforms within a measured latency of 232 ns. We show that this real-time sample integration improves significantly the beam position resolution and, consequently, the feedback performance. The best demonstrated real-time beam position resolution was 19 nm, which, as far as we are aware, is the best real-time resolution achieved in any operating BPM system. The feedback was operated in two complementary modes to stabilise the vertical position of the ultra-small beam produced at the focal point of the ATF2 beamline at KEK. In single-BPM feedback mode, beam stabilisation to 50$\pm$5 nm was demonstrated. In two-BPM feedback mode, beam stabilisation to 41$\pm$4 nm was achieved.
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