Offline Polarization Measurements of the Polarized Target at SpinQuest

The primary goal of the SpinQuest experiment at Fermilab is to measure the Transverse single spin asymmetry in the Drell-Yan and J/ψ processes. The experiment uses the Fermilab 120 GeV proton beam from the main injector, and a transversely polarized target comprising a cryogenic evaporation refrigerator operating at 1 K, a roots pump stack with 17000 m³/hour of pumping capacity, a 5 T superconducting magnet, and an extended interaction oscillator used to generate the microwave needed to polarize. Dynamic nuclear polarization (DNP) is used to achieve high polarization levels in solid NH₃ and ND₃ targets while a Q-meter-based nuclear magnetic resonance (NMR) system is used to measure the enhancement. An overview of the DNP process and offline polarization analysis for the first phase of production data will be presented in this talk.