SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 137: DAQ Test/RO – GRID II

T 137.3: Vortrag

Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0301

ITk-Pixel FELIX read-out chain stress test preparations — •Matthias Drescher, Jörn Große-Knetter, Arnulf Quadt, and Ali Skaf — II. Physikalisches Institut, Georg-August-Universität Göttingen, Germany

The current ATLAS Inner Detector will be upgraded to an all-silicon Inner Tracker (ITk) for the experiment's phase 2 upgrade. The ATLAS ITk read-out system employs the FELIX hardware/software system for interfacing the optical fiber cables of the on-detector components to the higher level infrastructure. Each FELIX board has 24 high-speed fiber links. In the Pixel subdetector configuration, each uplink fiber is connected to an lpGBT aggregator chip, which itself bundles 7 Aurora 64b/66b data lanes at 1.28 Gbps. In our case, the Aurora data is the output of the RD53A prototype front-end chip. To ensure stable operation under full load before moving to the final large-scale read-out system, a stress test populating all 24 of these fibers is being prepared.

Due to limited hardware availability, we aim for carrying out stress tests with lpGBT and RD53A emulators implemented on several Xilinx FPGA development boards instead of the respective ASICs. The hit maps sent by the RD53A emulators are stored in fast local memory, which would be written from a central controller PC connecting to the FPGA boards via Gigabit Ethernet. In order to prepare our stress test, we had to develop a set of helping tools and procedures that might also be used independently. For example, a dedicated programmer GUI software was developed to be used with the existing CERN USB-I2C dongle.