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Digital e/m Apparatus
Designed to be compact and in a light-shielding enclosure, the Digital e/m Apparatus which is also commonly known as a “Lorentz Force Demonstrator” is used to show magnetic and electrostatic deflection, measure e/m, and investigate electron beam behavior.
The Digital e/m Apparatus is a great way to demonstrate Lorentz Force!
Designed to be compact and in a light-shielding enclosure, the Digital e/m Apparatus which is also commonly known as a “Lorentz Force Demonstrator” is used to show magnetic and electrostatic deflection, measure e/m, and investigate electron beam behavior.
The Digital e/m Apparatus has a sharply focused electron beam that is projected into a vacuum containing a trace of inert gas. Ionization of the gas around the electron beam maintains the sharp focus of the beam and creates a glowing discharge which marks the path of the electrons. The apparatus shows deflection of the beam by transverse electric fields and by magnetic fields of various orientations. The e/m value can be found by bending the electron beam into a circular path with a homogeneous magnetic field and measuring the radius of the circular beam path, the strength of the magnetic field, and the accelerating voltage of the electron gun.
- 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
