A device for planimetry of magnetic field models

The proper design of a mass, or energy, magnetic spectrograph, requires a prior knowledge of the magnetic field along the ion-beam trajectory, particularly at the magnet's entrance and exit. With such data, a computer program may be developed which would enable us to define the trajectory of a charged particle in the measured field. An electromagnet has been built, having a variable magnetic-gap ranging from zero to six centimeters. This aparatus is able to generate a field of 1 tesla (104 gauss) with a magnetic-gap of 2 cm. It has provision for interchangeable edges either flat or curved, to simulate the field that should be used in the future construction of a spectrograph. The electromagnet's coils were built according to a new technique developed by us to facilitate the construction work and which favors heat from inside out. A, X, Y, Z meter was also designed and built which use a Hall detector to measure the 'Z' component of the magnetic field 'Bz' to an accuracy of less than 1 gauss. It provides a direct reading for the spacial position X, Y, Z with a 0.05 milimeters resolution. (Author)