What device allows you to observe traces of charged particles in the form of a strip of water droplets in a gas?

The Wilson camera allows you to observe the traces of charged particles. The top of the chamber is closed with a glass plate, in the lower part of it there is a piston. The working space of the chamber is filled with saturated and well-purified steam of water (alcohol, ether). With a sharp expansion of the working volume, the vapors quickly cool and become supersaturated. A fast charged particle, when it collides with molecules, turns them into ions. Vapors condense on the ions, forming a visible trail of droplets. The trace through the glass cover is photographed for further processing.