Design and Beam Test Results for the 2-D Projective sPHENIX Electromagnetic Calorimeter Prototype

C. A. Aidala, S. Altaf, R. Belmont, S. Boose, D. Cacace, M. Connors, E. Desmond, J. Frantz, E. A. Gamez, N. Grau, J. S. Haggerty, A. Hodges, J. Huang, Y. Kim, M. D. Lenz, W. Lenz, N. A. Lewis, E. J. Mannel, J. D. Osborn, D. V. PerepelitsaM. Phipps, R. Pisani, S. Polizzo, A. Pun, M. L. Purschke, C. Riedl, T. Rinn, A. C. Romero Hernandez, M. Sarsour, Z. Shi, A. M. Sickles, C. Smith, S. Stoll, X. Sun, E. Thorsland, F. Vassalli, X. Wang, C. L. Woody

Research output: Contribution to journalArticlepeer-review


sPHENIX is a new experiment under construction for the Relativistic Heavy Ion Collider at Brookhaven National Laboratory which will study the quark-gluon plasma to further the understanding of quantum chromodynamics (QCP) matter and interactions. A prototype of the sPHENIX electromagnetic calorimeter (EMCal) was tested at the Fermilab Test Beam Facility in Spring 2018 as experiment T-1044. The EMCal prototype corresponds to a solid angle of \Delta \eta \times \Delta \phi = 0.2 \times 0.2 centered at pseudo-rapidity \eta = 1. The prototype consists of scintillating fibers embedded in a mix of tungsten powder and epoxy. The fibers project back approximately to the center of the sPHENIX detector, giving 2-D projectivity. The energy response of the EMCal prototype was studied as a function of position and input energy. The energy resolution of the EMCal prototype was obtained after applying a position-dependent energy correction and a beam profile correction. Two separate position-dependent corrections were considered. The EMCal energy resolution was found to be \sigma (E)/\langle E\rangle = 3.5(0.1) \oplus 13.3(0.2)/\sqrt {E} based on the hodoscope position-dependent correction, and \sigma (E)/\langle E\rangle = 3.0(0.1) \oplus 15.4(0.3)/\sqrt {E} based on the cluster position-dependent correction. These energy resolution results meet the requirements of the sPHENIX physics program.

Original languageEnglish (US)
Article number9321702
Pages (from-to)173-181
Number of pages9
JournalIEEE Transactions on Nuclear Science
Issue number2
StatePublished - Feb 2021
Externally publishedYes


  • Calorimeters
  • Spaghetti calorimeter (SPACAL)
  • electromagnetic calorimetry
  • performance evaluation
  • prototypes
  • relativistic heavy ion collider (RHIC)
  • silicon photomultiplier (SiPM)
  • simulation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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