High-vacuum electron tube with divergent electron gun aimed at a fluorescent screen partially obscured by a Maltese cross. For demonstrating the linear propagation of electrons in the absence of applied electromagnetic fields by projecting the shadow of a Maltese cross onto the fluorescent screen. Application of a magnetic field using the Helmholtz Coils (B8A49475) allows for students to study the fundamental science of electron optics; such as beam focusing.
The tube comprises of the standard spherical glass body with cylindrical neck; a diode electron gun with a filament and cylindrical anode connected to 4mm sockets in the plastic cap; a metal Maltese cross mounted in the centre of the sphere (connected via a 4mm plug in one of the side caps) and a phosphor coated screen.
Technical Specifications:
- Maximum filament voltage: =7.5V AC/DC
- Maximum anode voltage: 5 kV
- Anode current: 0.18mA at 4kV
Requires the following equipment to operate:
- B8A49463 - Universal Stand
- B8R02653 - EHT Power Supply - to power the anode
- B8R07149 - EHT Experiment Leads (3 required)
- B8G85458 - Bench Power Supply - to power the filament
- B8R06545 - 4mm Leads
- B8A49475 - Helmholtz Coils (Optional)
- B8G85483 - College Power Supply Unit - to power the optional Helmholtz Coils