What is this Reservoir or Tube for?
At CERN, to trap antimatter particles scientists use magnetic fields with ultra high vacuum. (To trap charged antimatter particles) . It is necessary to isolate antimatter particles to prevent their annihilation with ordinary matter particles of container.
Below is the picture of a cylinder with a volume of 1.2 litres made from solid copper and was holding the reservoir in which the antiparticles were trapped at CERN. The object has experienced three historical moments in antimatter research:
1. The first demonstration of antiproton trapping for longer than one year;
2. The most stringent vacuum that has ever been achieved by an experiment on Earth (1.2 e-18 mbars);
3. The most precise measurement of the magnetic moment of the antiproton with a fractional precision of 1.5 parts per billion (ppb).
Credits: CERN
