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The Cluster Control Board of the JEM-EUSO mission

机译：JEM-EUSO任务组的集群控制委员会

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The Cluster Control Board (CCB) is one of the key elements of the JEM-EUSO read-out electronics, whichmanages the data received from eight units of the Photo Detector Module (PDM) of JEM-EUSO, performing data selec-tionand transmission. To reduce the large amount of data produced at the detector level and to discriminate the goodExtensive Air Shower (EAS) events from the spurious ones, a hierarchical trigger scheme over two levels has been devel-oped.The first trigger level consists of three sub-levels which are implemented within the front-end Application SpecificIntegrated Circuit (ASIC) and the PDM electronics. The second trigger level is implemented in the CCB electronics.After the onboard processing of the data received from 8 PDMs at a rate of around 57 Hz, potentially good events aretransmitted to the onboard CPU at the level of around 5 mHz. In this paper, we will firstly present the algorithm developedfor the second trigger level, focusing on its implementation in hardware. The algorithm aims at distinguishing the uniquepatterns produced on the focal surface by the EAS from the ones produced by background events. It is based on the scanof a predefined set of directions, which covers the complete parameter space, to find good patterns associated with theEAS. The final set of directions has been carefully optimized to adapt the algorithm to the limited on-board computingpower. To fulfill the requirement on the processing time, the algorithm was implemented in a Field Programmable GateArray in order to make use of its parallel processing capabilities. After presenting the current architecture of the CCB anddiscussing the complex interfaces with the other elements of the read-out electronics, we will report on the performanceof the laboratory model.
机译：机群控制板（CCB）是JEM-EUSO读出电子设备的关键要素之一，它管理从JEM-EUSO的光电检测器模块（PDM）的八个单元接收的数据，执行数据选择和传输。为了减少在检测器级别产生的大量数据并从假事件中区分良性广泛的空气淋浴（EAS）事件，已开发了两个级别的分层触发方案。第一个触发级别包括三个子级别，在前端专用集成电路（ASIC）和PDM电子产品中实现的级别。第二个触发级别在CCB电子设备中实现。在以大约57 Hz的速率对从8个PDM接收到的数据进行车载处理后，潜在的好事件以大约5 mHz的速率传输到车载CPU。在本文中，我们将首先介绍为第二级触发器开发的算法，重点是其在硬件上的实现。该算法旨在区分由EAS在焦面上产生的独特图案与由背景事件产生的独特图案。它基于对预定义方向的扫描，该方向覆盖了整个参数空间，以查找与EAS相关的良好模式。最后一组方向已经过仔细优化，以使算法适应有限的机载计算能力。为了满足对处理时间的要求，该算法在现场可编程门阵列中实现，以利用其并行处理能力。在介绍了CCB的当前体系结构并讨论了与读出电子设备的其他元素的复杂接口之后，我们将报告实验室模型的性能。

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