Radon Mitigation for the SuperCDMS SNOLAB Dark Matter Experiment
- Mr. Joseph STREET
- Mr. Joseph STREET (SD Mines)
A potential background for the SuperCDMS SNOLAB dark matter experiment is from radon daughters that have plated out onto detector surfaces. To reach background requirements, understanding plate-out rates during detector fabrication as well as mitigating radon in surrounding air is critical. A radon mitigated cleanroom planned at SNOLAB builds upon a system commissioned at the South Dakota School of Mines & Technology (SD Mines). The ultra-low radon cleanroom at SD Mines has air supplied by an optimized vacuum-swing-adsorption radon mitigation system that has achieved > 1000× reduction for a cleanroom activity consistent with zero and < 0.067 Bq/m$^3$ at 90% confidence. Our simulation of this system, validated against calibration data, provides opportunity for increased understanding and optimization for this and future systems.