Abstract:

I will report on the development of bubble chambers for COUPP, an approach to particle dark matter detection using moderately superheated, room-temperature CF3I. Calibrations indicate an extreme intrinsic rejection factor of O(1E-10) for minimum-ionizing backgrounds, while remaining fully sensitive to low-energy (few keV) nuclear recoils. I will discuss our first results, future plans, and the expected dark matter sensitivity of new larger devices (4, 15, and 60 kg) coming online now following recent improvements in radon control.