and if these concrete blocks magnets conducted protons into the cloud chamber. scientists simulate the composition and conditions of different atmospheres and observe how they react to ionizing particles. what you see that silver cylinder is actually the thermal housing the surrounds the cloud the chamber itself is three metre chamber is inside of. it's a very special chamber because it's the cleanest chamber in the world and in fact is the only chamber where we can do these experiments. the chamber has to remain absolutely sterile in order to carry out experiments with gas mixtures the slightest impurities could cause problems. now the importance of the particle beam is there to provide some adjustable source of