loop. A vapour pressure thermometer, 9, f'dled with hydrogen, is used to determine the temperature in the target.
The quality of the sealing of the track-sensitive target determines the possibility of neon from the chamber getting into its working volume. During operation, therefore, gas samples are taken from the target to measure the Ne content in them. The relative Ne content in the H2 is determined by an interferometric method. 0.4 mm stainless steel windows 10 are made in the front and back walls for the passage of particles through the target.
Heat exchange and temperature control system of the chamber and track-sensitive target Since the chamber and track-sensitive target contained a Ne + H2 mixture and H2, that is liquids with several different thermodynamic properties, the heat exchange system of the chamber, described elsewhere, 16 had to be considerably altered. The heat exchange system, used in the chamber with the target, is shown in Fig. 2. Heat exchangers 1,2, 3, and 5 are for temperature control of the chamber working volume and the space round the piston. Heat exchanger 4 is for the hydrogen volume of the track-sensitive target. The design of heat exchangers 1, 3, and 5 remained as before. Heat exchanger 2 is a loop of copper tubing, fixed under the main glass of the chamber, the loop of heat exchanger 4 is placed in the track-sensitive target.