We present a design for a high-granularity calorimeter insert for future experiments at the Electron-Ion Collider (EIC). The sampling-calorimeter design uses scintillator tiles read out with silicon photomultipliers. It maximizes coverage close to the beampipe, while solving challenges arising from the beam-crossing angle and mechanical integration. It yields a compensated response that is linear over the energy range of interest for the EIC. Its energy resolution meets the requirements set in the EIC Yellow Report even with a basic reconstruction algorithm. Moreover, this detector will provide 5D shower data (position, energy, and time), which can be exploited with machine-learning techniques. This detector concept has the potential to unleash the power of imaging calorimetry at the EIC to enable measurements at extreme kinematics in electron–proton and electron–nucleus collisions. 

pdf/a-high-granularity-calorimeter-insert-based-on-sipm-on-tile-36mok2gu.pdf

A high-granularity calorimeter insert based on SiPM-on-tile technology at the future Electron-Ion Collider

Abstract We recently proposed a high-granularity calorimeter insert for the Electron-Ion Collider (EIC) that is based on plastic scintillator tiles readout with silicon photomultipliers. In this work, we concretize its design by characterizing its building blocks with measurements of light yield, optical crosstalk, and timing resolutions using cosmic-rays, an LED, and a beta source. We also compared two approaches for the optical isolation of cells: “megatiles” with grooved boundaries between cells, and a 3D-printed plastic frame hosting individual cells. We found that the latter suppresses optical crosstalk to negligible levels while providing an easier assembly method. Overall, these performance studies can help inform calorimeter design and realistic simulations of 5D showers (time, energy, position) for the EIC and other experiments. 

Studies of time resolution, light yield, and crosstalk using SiPM-on-tile calorimetry for the future Electron-Ion Collider

Hadron calorimeter (HCAL) is an essential sub-detector of the baseline detector system for Circular Electron Positron Collider (CEPC). We plan to build an Analog Hadron CALorimeter (AHCAL) prototype based on the Particle Flow Algorithm (PFA). The AHCAL of CEPC uses scintillator tiles and Silicon Photo-Multipliers (SiPMs) as sensitive medium, and iron as absorber. The energy linearity and resolution of the calorimeter is affected by the light yield uniformity of sensitive medium. It's essential to do the batch test of the scintillator tiles' light yield and qualify the scintillators within 10\%. An automated batch test platform has been designed with 144 channels, using 3D servo motor runs automatically. This paper summarize more than 15k scintillators with light yield around 12.9 p.e., and the result is calibrated by test platform channel non-uniformity. About 91.6\% of scintillators (14219 pieces) are qualified within 10\% of light yield window.

Scintillator Tile Batch Test of CEPC AHCAL.

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Scintillator Tile Batch Test of CEPC AHCAL.