The LZ Photoneutron Calibration Source

The LUX-ZEPLIN (LZ) detector will be a two-phase time projection chamber with a seven ton liquid xenon target used to search for dark matter. I will present the design of the LZ photoneutron source, which will produce neutrons with recoil energies in xenon of just a few keV. This source will calibrate the LZ detector response to these low-energy nuclear recoils (NRs). The light and charge yields of xenon at these NR energies are currently not well measured and could have significant impact on the detector efficiency--and therefore the sensitivity of LZ to low-mass (< 20 GeV) dark matter. This calibration will also constrain the detector efficiency for coherently scattering astrophysical 8B neutrinos, a background in low-mass dark matter searches and an interesting physics topic in its own right. I will focus on both the mechanical design and deployment strategy of the source and simulations used to predict the effectiveness of the calibration.