Xenon Doped Liquid Argon for Scintillation Wavelength Shifting in CENNS-10 Detector

CENNS-10 is the COHERENT Collaboration's 24kg liquid argon (LAr) scintillation detector, which operated at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory and recorded the first observation of coherent elastic neutrino-nucleus scattering on LAr. CENNS-10 utilized tetraphenylbutadiene (TPB) as a primary source of UV to visible wavelength shifting and included the use of Xe-doped liquid Ar (XeDLAr) as an additional wavelength shifter in later detector upgrades. We designed and built a gas injection system to produce the XeDLAr and utilized residual gas analysis to analyze the resulting gas mixtures in the CENNS-10 detector. This poster will discuss the Xe-Ar doping method and apparatus used, the analysis of XeDLAr samples from CENNS-10, and application of this method to the forthcoming ton-scale LAr detector, COH-Ar-750.