Abstract
The Tile Calorimeter (TileCal) is one detector of the ATLAS experiment at the Large Hadron Collider (LHC). TileCal is a sampling calorimeter made of steel plates and plastic scintillators which are readout using approximately 10,000 PhotoMultipliers Tubes (PMTs). In 2024, the LHC will undergo a series of upgrades towards a High Luminosity LHC (HL-LHC) to deliver up to 7.5 times the current nominal instantaneous luminosity. The ATLAS Tile Phase II Upgrade will accommodate detector and Data AcQuisition (DAQ) system to the HL-LHC requirements. The detector electronics will be redesigned using a new clock distribution and readout architecture with a full-digital trigger system. After the Long Shutdown 3 (2024-2026), the on-detector electronics will transfer digitized data for every bunch crossing (~25 ns) to the Tile PreProcessors (TilePPr) in the counting rooms with a total data bandwidth of 40 Tbps. The TilePPrs will store the detector data in pipeline memories to cope with the new ATLAS DAQ architecture requirements, and will interface with the Front End Link eXchange (FELIX) system and the first trigger level. The TilePPr boards will distribute the sampling clock to the on-detector electronics for synchronization with the LHC clock using high-speed links configured for fixed and deterministic latency. The upgraded readout and clock distribution strategy was fully validated in a Demonstrator system using prototypes of the upgraded electronics in several test beam campaigns between 2015 and 2018.
Highlights
TILECAL [1] is the central hadronic calorimeter of the ATLAS experiment [2] at the Large Hadron Collider (LHC) at CERN
The ATLAS Tile Calorimeter plans a complete redesign of the readout electronics for the High Luminosity LHC (HL-LHC) using a new readout strategy with a full-digital trigger
The sampling clock for the digitization of the PhotoMultipliers Tubes (PMTs) signals will be distributed embedded with the data from the off-detector electronics
Summary
TILECAL [1] is the central hadronic calorimeter of the ATLAS experiment [2] at the Large Hadron Collider (LHC) at CERN. The PMT analog signals are transmitted to the Level-1 Calorimeter trigger system. The digital samples corresponding to the events selected by the Level-1 trigger system are transmitted through optical fibers to the ReadOut Drivers (RODs) [3] located off-detector at a maximum trigger rate of 100 kHz in average. 32 ROD modules installed in four VME crates, corresponding to the four detector barrels, are used to operate the entire detector. The main tasks of the RODs, executed in Digital Signal Processors (DSPs), are energy and time reconstruction, synchronization of detector and trigger data, busy handling and data compression. The ROD receives 7 digital samples for each event selected by the Level-1 trigger system, and processes them within 10 μs to minimize the dead-time in the detector. The processed data are transmitted to the Level-2 trigger system located in the High Level Trigger (HLT)
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