High Speed Multichannel Charge Sensitive Data Acquisition System with Self-Triggered Event Timing.
High Speed Multichannel Charge Sensitive Data Acquisition System with Self-Triggered Event Timing.
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DOI：
10.1109/tns.2009.2015302
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发表时间：
2009-06-16
影响因子：
1.8
通讯作者：
Michalet X
中科院分区：
文献类型：
--
作者：
Tremsin AS;Siegmund OH;Vallerga JV;Raffanti R;Weiss S;Michalet X
许多现代实验需要在多个通道上同时测量电荷，事件速率> MHz，精度为100-1000 e− rms。一种广泛使用的数据处理方案依赖于特定集成电路的应用，该特定集成电路能够实现由外部触发器断言的多通道模拟峰值检测，随后是串行/稀疏读出。虽然这种配置最大限度地减少了后端电子设备，但其计数率能力受到串行读出速度的限制。模数转换器和FPGA器件的最新进展实现了全并行高速多通道数据处理，并通过有限脉冲响应滤波增强了数字峰值检测。不仅可以在高事件速率下获得准确的电荷值，而且还可以高精度地确定每个通道上的事件的定时。我们提出的概念和第一次实验测试的完全并行的128通道电荷敏感的数据处理电子能够测量电荷的精度为1000 e- rms。我们的系统不需要外部触发器，除了电荷值，它还提供了约1 ns FWHM精度的事件定时。该系统的一个可能的应用是高分辨率的位置敏感的事件计数探测器与微通道板结合交叉条读出。快速数据采集电子设备的实现将这些探测器的计数率提高到几MHz的水平，保留了它们对单个粒子（包括光子、电子、离子、中性粒子和中子）的位置（精度约为10 μm FWHM）和定时（约为1 ns FWHM）进行几乎无噪声探测的独特能力。
A number of modern experiments require simultaneous measurement of charges on multiple channels at > MHz event rates with an accuracy of 100-1000 e− rms. One widely used data processing scheme relies on application of specific integrated circuits enabling multichannel analog peak detection asserted by an external trigger followed by a serial/sparsified readout. Although this configuration minimizes the back end electronics, its counting rate capability is limited by the speed of the serial readout. Recent advances in analog to digital converters and FPGA devices enable fully parallel high speed multichannel data processing with digital peak detection enhanced by finite impulse response filtering. Not only can accurate charge values be obtained at high event rates, but the timing of the event on each channel can also be determined with high accuracy. We present the concept and first experimental tests of fully parallel 128-channel charge sensitive data processing electronics capable of measuring charges with accuracy of ~1000 e- rms. Our system does not require an external trigger and, in addition to charge values, it provides the event timing with an accuracy of ~1 ns FWHM. One of the possible applications of this system is high resolution position sensitive event counting detectors with microchannel plates combined with cross strip readout. Implementation of fast data acquisition electronics increases the counting rates of those detectors to multi-MHz level, preserving their unique capability of virtually noiseless detection of both position (with accuracy of ~10 μm FWHM) and timing (~1 ns FWHM) of individual particles, including photons, electrons, ions, neutrals, and neutrons.