Abstract
The first evaluation of an ultra-high granularity digital
electromagnetic calorimeter prototype using 1.0–5.8 GeV/c electrons
is presented. The 25 × 10
6
pixel detector consists of 24
layers ...of ALPIDE CMOS MAPS sensors, with a pitch of around
30 μm, and has a depth of almost 20 radiation lengths of
tungsten absorber. Ultra-thin cables allow for a very compact
design.
The properties that are critical for physics studies are measured:
electromagnetic shower response, energy resolution and linearity.
The stochastic energy resolution is comparable with the state-of-the
art resolution for a Si-W calorimeter, with data described well by a
simulation model using
Geant4
and Allpix
2
. The
performance achieved makes this technology a good candidate for use
in the ALICE FoCal upgrade, and in general demonstrates the strong
potential for future applications in high-energy physics.
Abstract
The ALICE ITS3 is a novel vertex detector replacing the innermost layers of ITS2 during
LS3. Composed of three truly cylindrical layers of wafer-sized 65 nm stitched Monolithic Active
Pixel ...Sensors, ITS3 provides high-resolution tracking of charged particles generated in heavy-ion
collisions. This contribution presents an overview of the ITS3 detector, highlighting its design
features, integration and cooling, and the ongoing development towards the final sensor.
Furthermore, the paper introduces the off-detector service electronics, which play an essential
role in the readout, control, and power supply of the detector.
Abstract
The ALICE inner tracking system has gone through a significant upgrade for the upcoming third running period of the CERN LHC. The new detector consists of seven layers of high-granularity ...pixel sensors, while 192 custom FPGA-based readout units control the sensors and transmit the data upstream for analysis. This contribution describes the current system status and the expertise gained by moving from surface commissioning to the installation and throughout the data-taking preparation period, focusing on the intricate integration with other system components. Selected challenges, issues, and lessons learned during the various commissioning periods are presented.
A prototype of a new type of calorimeter has been designed and constructed, based on a silicon–tungsten sampling design using pixel sensors with digital readout. It makes use of the ALPIDE sensor ...developed for the ALICE Inner Tracking System (ITS) upgrade. A binary readout is possible due to the pixel size of ≈30×30μm2. This prototype has been successfully tested with cosmic muons and with test beams at DESY and the CERN SPS. We report on performance results obtained at DESY, showing good energy resolution and linearity, and compare to detailed MC simulations. Also shown are preliminary results of the high-energy performance as measured at the SPS. The two-shower separation capabilities are discussed.
•First fully digital electromagnetic calorimeter with high-speed readout built.•ALPIDE pixel sensors work well in high particle-density environment.•Basic calorimetric performance of pixel calorimeter on par with state of the art.•Has unique capabilities in terms of position resolution and two-shower separation.
The first evaluation of an ultra-high granularity digital electromagnetic calorimeter prototype using 1.0-5.8 GeV/c electrons is presented. The \(25\times10^6\) pixel detector consists of 24 layers ...of ALPIDE CMOS MAPS sensors, with a pitch of around 30~\(\mu\)m, and has a depth of almost 20 radiation lengths of tungsten absorber. Ultra-thin cables allow for a very compact design. The properties that are critical for physics studies are measured: electromagnetic shower response, energy resolution and linearity. The stochastic energy resolution is comparable with the state-of-the art resolution for a Si-W calorimeter, with data described well by a simulation model using GEANT and Allpix\(^2\). The performance achieved makes this technology a good candidate for use in the ALICE FoCal upgrade, and in general demonstrates the strong potential for future applications in high-energy physics.
A prototype of a new type of calorimeter has been designed and constructed, based on a silicon-tungsten sampling design using pixel sensors with digital readout. It makes use of the Alpide MAPS ...sensor developed for the ALICE ITS upgrade. A binary readout is possible due to the pixel size of \(\approx 30 \times 30 \, \mu \mathrm{m}^2\). This prototype has been successfully tested with cosmic muons and with test beams at DESY and the CERN SPS. We report on performance results obtained at DESY, showing good energy resolution and linearity, and compare to detailed MC simulations. Also shown are preliminary results of the high-energy performance as measured at the SPS. The two-shower separation capabilities are discussed.
