Another great day working in the underground laboratory at #SNOLAB. My focus was on supporting the #PICO bubble chamber team today. Activities included starting the check of photomultiplier tubes (PMTs) in an underground “dark box” setup; and applying retroreflector material to steel cone sections.

The PMTs will be used in PICO-500’s water tank muon shield.

The reflectors help direct light onto the bubble chamber for good bubble photos.