Upgrade of the ATLAS Hadronic Tile Calorimeter for the High Luminosity LHC

Ignacio Asensi Tortajada

doi:10.1051/epjconf/201817001001

Abstract

The Large Hadron Collider (LHC) has envisaged a series of upgrades towards a High Luminosity LHC (HL-LHC) delivering five times the LHC nominal instantaneous luminosity. The ATLAS Phase II upgrade, in 2024, will accommodate the upgrade of the detector and data acquisition system for the HL-LHC. The Tile Calorimeter (TileCal) will undergo a major replacement of its on- and off-detector electronics. In the new architecture, all signals will be digitized and then transferred directly to the off-detector electronics, where the signals will be reconstructed, stored, and sent to the first level of trigger at the rate of 40 MHz. This will provide better precision of the calorimeter signals used by the trigger system and will allow the development of more complex trigger algorithms. Changes to the electronics will also contribute to the reliability and redundancy of the system. Three different front-end options are presently being investigated for the upgrade, two of them based on ASICs, and a final solution will be chosen after extensive laboratory and test beam studies that are in progress. A hybrid demonstrator module is being developed using the new electronics while conserving compatibility with the current system. The status of the developments will be presented, including results from the several tests with particle beams.

Highlights

The Large Hadron Collider (LHC) is a proton-proton collider with 14 TeV center of mass energy and design luminosity of 1034 cm−1s−1
Wavelength shifting fibers coupled to the tiles collect the light produced in the scintillators and are read out by photomultiplier tubes (PMTs)
The Demonstrator super-drawer is composed of four independent mini-drawers (Fig. 2), each of them equipped with 12 front-end boards of one of the three different options, shown in Fig. 3, one MainBoard for the corresponding front-end option, one Daughter Board that handles data processing and communications with the back-end electronics, one high voltage regulation board from the two options available, one adder base board plus 3 adder cards for the summation of the analog trigger signals to send to the Trigger, and one new Low Voltage Power Supply (LVPS)

Summary

Introduction

The Large Hadron Collider (LHC) is a proton-proton collider with 14 TeV center of mass energy and design luminosity of 1034 cm−1s−1. The ATLAS detector [1] is one of the two general purpose particle detectors at the LHC, and it consists of multiple sub-detectors which are designed to detect interesting particle physics events in 40 million bunch-crossings per second. The Tile Calorimeter is the central hadronic calorimeter in the central region of ATLAS (Fig. 1 (top)). It’s comprised of two Extended Barrels and a central Long Barrel divided in two sections, each divided into 64 slices. They are made out of alternating thin steel plates and scintillating tiles (Fig. 1 (bottom)). Fibers coupled to the tiles collect the light produced in the scintillators and are read out by photomultiplier tubes (PMTs)

Upgrade of the Tile Calorimeter

Testbeam campaigns

Findings

Conclusions