Nuclear plate cameras for the measurements of proton energies emitted from a toroidal discharge in deuterium
Two types of nuclear plate camera used for measurement of proton energies emitted from a toroidal discharge in deuterium in SCEPTRE are discussed. One of these records energies of protons emitted normal to the discharge axis, while the other records protons emitted at about 45° or 135° to the direction of positive gas current along the axis. A later model of the second type which records at both angles simultaneously, is also described. The size of slot in the wall of the discharge vessel necessitates that the second type of camera should be very small, and should be placed close to the wall. Measures to prevent damage to the nuclear plate by shock waves or overheating are given. The energy resolution of the cameras has also been found using a monoenergetic beam of protons from the A.E.I. electrostatic generator.