  The super Pioneering High Energy Nuclear Interaction eXperiment (sPHENIX) at
the Relativistic Heavy Ion Collider (RHIC) will perform high precision
measurements of jets and heavy flavor observables for a wide selection of
nuclear collision systems, elucidating the microscopic nature of strongly
interacting matter ranging from nucleons to the strongly coupled quark-gluon
plasma. A prototype of the sPHENIX calorimeter system was tested at the
Fermilab Test Beam Facility as experiment T-1044 in the spring of 2016. The
electromagnetic calorimeter (EMCal) prototype is composed of scintillating
fibers embedded in a mixture of tungsten powder and epoxy. The hadronic
calorimeter (HCal) prototype is composed of tilted steel plates alternating
with plastic scintillator. Results of the test beam reveal the energy
resolution for electrons in the EMCal is $2.8\%\oplus~15.5\%/\sqrt{E}$ and the
energy resolution for hadrons in the combined EMCal plus HCal system is
$13.5\%\oplus 64.9\%/\sqrt{E}$. These results demonstrate that the performance
of the proposed calorimeter system satisfies the sPHENIX specifications.
