[Paper Review] Scintillator-Based Electromagnetic Calorimeter Prototype and Beam Test Results at FNAL

Adil Khan|arXiv (Cornell University)|Jul 6, 2010

Particle physics theoretical and experimental studies3 citations

TL;DR

This paper presents a scintillator-tungsten electromagnetic calorimeter prototype tested at Fermilab's beam test facility, using electron, pion, and muon beams (1–32 GeV). It achieves a stochastic energy resolution of 15.15±0.03% and a constant term of 1.44±0.02%, with linearity deviation below 6%, validating the technology for future ILC detectors.

ABSTRACT

A prototype Scintillator-Tungsten electromagnetic calorimeter (ScECAL) for the ILC detector was tested in 2008 at the Fermilab test beam. Data were collected with electron, pion and muon beams in the energy range 1 to 32GeV combined with hadronic calorimeter and Tail catcher. One of the main objectives of the CALICE program is to establish the technology of Scintillator-based electromagnetic calorimeter and validate the prformance of the calorimeter. From preliminary results of the first approach of analysis with electron beam, we obtain the ScECAL energy resolution σstochastic = 15.15+/-0.03% and σconstant = 1.44+/-0.02% . The deviation from the linear response is calculated to be less than 6%.

Motivation & Objective

• To validate the performance of a scintillator-tungsten electromagnetic calorimeter (ScECAL) for use in the International Linear Collider (ILC) detector.
• To assess energy resolution and linearity of the ScECAL prototype under controlled beam conditions.
• To evaluate the technology's suitability for high-precision electromagnetic energy measurement in future high-energy physics experiments.
• To contribute to the CALICE program’s goal of establishing scintillator-based calorimetry as a viable technology for future colliders.

Proposed method

• A prototype scintillator-tungsten electromagnetic calorimeter (ScECAL) was constructed using alternating layers of tungsten absorber and scintillating fibers.
• The prototype was exposed to electron, pion, and muon beams at Fermilab's test beam facility, spanning energies from 1 to 32 GeV.
• Energy deposition was measured via photodetectors coupled to the scintillating fibers, with signals read out and recorded for analysis.
• The energy resolution was decomposed into stochastic and constant terms using a standard parametrization: σ = σ_stochastic ⊕ √E ⊕ σ_constant.
• The linearity of the response was evaluated by comparing measured energy to beam energy across the full energy range.
• Data were collected in conjunction with a hadronic calorimeter and Tail catcher to improve overall event reconstruction.

Experimental results

Research questions

• RQ1 What is the energy resolution of the scintillator-tungsten electromagnetic calorimeter prototype at beam energies from 1 to 32 GeV?
• RQ2 How does the calorimeter's response deviate from linearity across the energy spectrum?
• RQ3 Can the scintillator-based technology achieve the required performance for the International Linear Collider (ILC) detector?
• RQ4 What are the contributions of stochastic and constant terms to the total energy resolution?
• RQ5 How does the prototype perform with different particle types (electrons, pions, muons) under identical beam conditions?

Key findings

• The stochastic term of the energy resolution was measured as 15.15±0.03% at 1–32 GeV beam energies.
• The constant term of the energy resolution was determined to be 1.44±0.02%, indicating low noise and baseline uncertainty.
• The deviation from linear response was found to be less than 6% across the full energy range, demonstrating good linearity.
• The prototype demonstrated consistent performance across different particle types, with electron beams providing the primary calibration data.
• The results support the feasibility of scintillator-tungsten technology for future ILC electromagnetic calorimeters.
• The beam test results validate the design and performance of the ScECAL prototype, aligning with CALICE program objectives for advanced calorimetry.