R{\&}D Toward Future Liquid Xe Double Beta Detectors

We report on several R{\&}D projects aimed at possible future ton-scale Xe detectors for 0nuBB searches. A liquid Xe cell is being developed to measure material reflectivity for Xe scintillation light in liquid Xe, knowledge of which will be important for detector design and optimization. A vacuum test chamber, equipped with with cryogenic cooling and sources of VUV light, is being commissioned for candidate scintillation detectors. Finally, 136Cs, produced by 136Xe(p,n) at an accelerator, is being pursed as a source of Ba+ ions useful to ongoing R{\&}D toward extraction and identification of the double beta decay daughter in $^{136}$Xe.