E/M Apparatus with Power Supply, Daedalon®

This classic experiment consists of a vacuum tube within which a fine electron beam is formed. The tube is surrounded by a pair of Helmholtz coils providing a transverse magnetic field. The magnetic field bends the electron beam into a circular path. Helium gas at low pressure inside the tube fluoresces making the beam visible. The regulated accelerating voltages can be varied from 100 to 500 Vdc. The Helmholtz coil current adjusts from 0 to 3 A. The orbit diameter is measured on an internal glass scale with fluorescent radius marks. The mark lights up when the beam strikes it, making it easy to determine the exact beam diameter. A pair of three-digit panel meters display the power supplies output. · Measures charge/mass ratio of the electron. · Internal computer voltage & current control. · Power supplies in base of apparatus. · Large Helmholtz coils for uniform magnetic field. Specification: Tube Diameter: 13 cm Electron Gun: indirectly-heating cathode with accelerating anode Helmholtz Coils: Radius: 15 cm Separation: 15 cm Turns: 132 per coil Magnetic Field: 7.8 mT/A High Volage: 100-500 Vdc adjustable with front panel control Coil Current: 0-3 A adjustable with current regulated supply. Meters: two 3-digit LED panel meters L x W x H: 30 x 40 x 38 cm (11.8 x 15.7 x 15 in)