To detect the flux of muons, which will tell us how many of the muons coming from the space are still “alive” per second, we will build a cloud chamber. A cloud chamber is a simple particles detector that thanks to a supersaturated atmosphere of vapor of alcohol can keep track of the charge particles that cross the detector.
We will use an open cell polyethylene foam which is a very good insulator not only for heat but also for humidity and pressure. We will use also the same material to protect the cloud chamber from the others subsystems inside the module. Rubber bumpers will be also used to protect the cloud chamber from vibrations, temperature and from the shock when the landing.
The cloud chamber will be build using aluminium for the structure and polycarbonate for the faces. Aluminium has a very high thermal conductivity which is very important in order to create the thermal gradient and polycarbonate is transparent and a very strong material. We are searching for different companies that work with this kind of materials to build the cloud chamber. There will be also sponges on the top of cloud chamber that will contain the alcohol. For the cold source we will use dry ice. Another important feature of the cloud chamber is its height. In our case there will be a gradient of 5.3 degrees per centimetre which is under the threshold needed for supersaturation that is 3.6 degrees per centimetre.
During the ascent phase and float, we will record and downlink images of what is happening inside the chamber considering always at which altitude are they taken.