e/m Apparatus in Light-Shielding Enclosure

Overview

Compact, all-in-one apparatus in light-tight enclosure to study the motion of electrons under the influence of electric and magnetic fields and determine their charge-to-mass ratio. Instructional manual with historical background, relevant web links and sample data with analysis included. Arbor Scientific teaching consultants are available by appointment for questions and technical advice.

Features and Specs

Fine Beam Tube: A low-pressure 16-cm diameter inert gas-filled tube is mounted vertically and can rotate 180 degrees for fine adjustment of the horizontally-projected electron beam and observation of spiral orbits.
Light-tight enclosure: The entire apparatus is in a light-tight enclosure, very convenient for operating in normal lighting conditions.
Built-in Digital Voltage Supply: Sets of accelerating and deflecting electrodes have built-in voltage supplies with digital readouts.
Built-in Digital Current Supply: A pair of permanently-mounted Helmholtz coils has built-in variable current power supply with digital readout.
Measurement Aides: Metric scale and viewing aides to accurately determine the electron-orbit radius are included.

Specifications

Vacuum tube: Diameter: 160mm
Voltages: Acceleration: 0 - 250V, Deflection: 50-250V, Current: 0.5 - 2.5A
Helmholtz coils: Mean radius: 280mm, 140 turns
Dimensions: 35cm x 45cm x 30cm
Weight: 11 kg
Power: 110 VAC/45W