The PICO 60 experiment is currently the largest bubble chamber under operation. It was filled with CF3I and taking data at in the ladder lab area of SNOLAB  from 2013 to May 2014 (to take a closer look at the experiment follow this link and choose image 25 on the virtual reality tour of SNOLAB). View from the top of the water shield. The experiment is located in the pressure vessel at the centre. 

In summer of 2014 the data taking with the detector was suspended to allow the detector to be upgraded and refurbished. At the moment PICO 60 is being cleaned and taken apart so that a new run can start in summer 2016. For this run II of the experiement it will be filled with C3F8 to increase the sensitivity to spin dependent dark matter interactions. The new run will also allow the detector to be filled with the full 45 litres of active mass. In the first run only two high speed, high resolution cameras were installed which only allowed the active volume to be about 25 litres. The experiment was assembled and cleaned so that particulate contamination was reduced significantly. The current run seems to indicate that the background due to particulates has been supressed.    
Inner vessel of PICO 60 during the installation for run 2 in June 2016.


Dark matter experiments are located in laboratories deep underground so that natural radiation can not create false signals. In addition the PICO 60 experiment is surrounded by a water shield that absorbes neutrons that are created in the rock surrounding the lab. It is therefore often very dull to visit a dark matter experiment in its underground location: no active part of the experiment is visible and instead all you see is a large water tank. The images on this page show images from the construction phase when the inside of the experiment was accessible.
Image of the outer shielding during installation



last update: 30.10.2017
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