15-20 June 2014
Laurentian University / Université Laurentienne
America/Toronto timezone
Welcome to the 2014 CAP Congress! / Bienvenue au congrès de l'ACP 2014!

Surface Alpha Background Mitigation in DEAP-3600

19 Jun 2014, 09:15
C-112 (Laurentian University / Université Laurentienne)


Laurentian University / Université Laurentienne

Sudbury, Ontario
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Particle Physics / Physique des particules (PPD) (R1-9) Future of Cosmic Frontier: Dark Matter II - PPD-DNP-DTP / Avenir de la frontière cosmique: matière sombre II - PPD-DPN-DPT


Mr Joshua Bonatt (Queen's University)


Radon and its decay daughters are a well known source of background in direct WIMP detection experiments, as either a radon decay daughter or an alpha particle emitted from a thin inner surface layer could produce a WIMP-like signal. The acrylic vessel, which is the central part of the DEAP-3600 detector, is susceptible to surface diffusion of radon, when exposed to natural air. To remove diffused isotopes from the inner acrylic vessel, a sanding robot (called the Resurfacer) was designed to remove approximately 1 mm from the interior surface. Commissioning and testing has been carried out at Queen's University. Surface Polonium-210 alpha events have also been simulated with GEANT4 to study the signature of these backgrounds in the detector. Details of the Resurfacer, along with the results of tests and simulations will be presented.

Primary author

Mr Joshua Bonatt (Queen's University)

Presentation Materials