Full-system commissioning of TGC frontend electronics for Phase-2 LHC-ATLAS

The Thin Gap Chambers (TGCs) of the LHC-ATLAS are responsible for triggering muons in the endcap region at the hardware trigger stage. The frontend system of TGC will be upgraded for HL-LHC to send binary hit-map at every bunch crossing (BC) to the backend system. Such an operation requires lots of unique challenges: high-performance hit BC Identification, fine-tuned clock distribution, and the capability of timing calibration. Accommodating these requirements, the primary processor board (PS-Board) is in charge of data processing and reception of control signals distributed by the backend. An independent control module (JATHub) will take responsibility for FPGA configuration and clock phase monitoring of the PS-Boards with an SoC-based design. The timing calibration methodology for fine-tuning the clock phase and signal timing is migrated with highly-extended flexibility in the Phase-2 system, exploiting the experience accumulated through the construction, commissioning, and operation of the existing TGC system. System-level commissioning has been launched at KEK with prototypes of PS-Boards and JATHub and analogue frontend electronics of Amplifier-Shaper-Discriminator (ASD) cards. The full-chain testbed system allows us to demonstrate fundamental functionalities of Trigger, Readout, Control and Calibration: clock phase fine-tuning, signal timing calibration, and hit readout with test pulse injection to ASD channels with adjusted timing parameters.