nuclear research or cern in switzerland. it's also home to the famous l h c particle accelerator the cloud experiment is also based here. in. the am so here we are in an experimental hall at the at cern. under these concrete blocks magnets conducted protons into the cloud chamber. scientists simulate the composition and conditions of different atmosphere and observe how they react to ionizing particles. not what you see about silver cylinder though it's actually the thermal housing that surrounds the cloud chip the chamber itself is three metre chamber is inside of that it's