论文标题
辐射探测器读数电子设备的白兔时间同步
White Rabbit Time Synchronization for Radiation Detector Readout Electronics
论文作者
论文摘要
随着核物理应用中的辐射探测器阵列变得更大且物理上更加分开，时间同步和触发探测器读出电子设备之间的触发分布变得更加具有挑战性。传统上，时钟和触发器是通过专用电缆分配的，但是诸如IEEE 1588精密时间协议和白兔子之类的较新方法可以通过通过以太网交换定时消息来同步时钟。因此，我们在这里报告了在新的检测器读数模块Pixie-net XL中使用白兔子。白色兔子核心，来自多个数字化通道的数据捕获以及随后在Kintex 7 FPGA中实现了脉冲高度和恒定分数时间的脉冲处理。检测器数据记录包括白兔子时间戳记，并通过白色兔子核心的千兆以太网数据路径或使用嵌入式ZYNQ处理器传输到存储。该性能的特征是飞行时间样式的测量以及来自探测器中宇宙淋浴的高能量背景事件的时间相关，这些事件被较长的距离隔开。 Zynq处理器的软件可以实现“软件触发”，例如将数据记录限制为事件，其中来自多个模块的最小频道同时检测辐射。
As radiation detector arrays in nuclear physics applications become larger and physically more separated, the time synchronization and trigger distribution between many channels of detector readout electronics become more challenging. Clocks and triggers are traditionally distributed through dedicated cabling, but newer methods such as the IEEE 1588 Precision Time Protocol and White Rabbit allow clock synchronization through the exchange of timing messages over Ethernet. Consequently, we report here the use of White Rabbit in a new detector readout module, the Pixie-Net XL. The White Rabbit core, data capture from multiple digitizing channels, and subsequent pulse processing for pulse height and constant fraction timing are implemented in a Kintex 7 FPGA. The detector data records include White Rabbit time stamps and are transmitted to storage through the White Rabbit core's gigabit Ethernet data path or a slower diagnostic/control link using an embedded Zynq processor. The performance is characterized by time-of-flight style measurements and by time correlation of high energy background events from cosmic showers in detectors separated by longer distances. Software for the Zynq processor can implement "software triggering", for example to limit recording of data to events where a minimum number of channels from multiple modules detect radiation at the same time.
