The dual beam tube is a partly evacuated electron tube, filled with neon at low pressure and equipped with both axial and perpendicular electron guns. The electron beams are perpendicular to one another and a common deflector plate is provided for both guns. The electron beam source is an oxide cathode heated indirectly via a heating coil. The electron paths show up as a fine, orange beam due to impact excitation of the neon atoms. The dual beam tube can be used to determine the specific charge e/m from the diameter of the path followed by electrons fired into the tube from a perpendicularly mounted gun with a vertically aligned magnetic field and observation of the spiral path followed by electrons fired axially into a co-axial magnetic field.
Experiment topics:
- Determination of the specific charge e/m for tangential injection and perpendicular magnetic field
- Observation of the spiral path followed by electrons fired axially into a co-axial magnetic field
Specifications:
- Filament voltage UF: max. 7.5V AC/DC
- Anode current IA: max. 30mA
- Anode voltage UA: maximum value so that the anode current IA ≤ 30mA (typical 120 - 300V DC)
- Deflector voltage: max. 50V DC
- Glass bulb: 130mm Ø approx.
- Total length: 260mm approx.
- Gas filling: neon
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