US $  1,275.00

26 x 11.5 x 3.5 cm 10.2 x 4.5 x 1.4 in

0.7 kg 1.54 lb

 

The Fine Beam Tube is for examining the deflection of electron beams in a uniform magnetic field using a pair of Helmholtz coils and for the quantitative determination of the specific charge of the electron. 

Experiment topics:
• Deflection of electrons in a closed circular path inside a magnetic field.
• Determination of specific charge of an electron e/m.

The evacuated glass tube is integrated with an electron beam system consisting of:
• an indirectly heated oxide cathode
• a Wehnelt cylinder and a perforated anode
• residual gas atmosphere with set gas pressure
• integrated measurement marks for parallax-free measurements

The gas atoms are ionized along the electron path and produce a sharply defined, visible fluorescent beam. The tube is mounted on a base with color coded connectors.

Gas filling: Neon
Gas pressure: 1.3 x 10^-5 hPa
Filament voltage: 4 – 10 V AC/DC
Filament current: 300 – 450 mA
Wehnelt voltage: 0 – -50 V
Anode voltage: 200 – 300 V
Anode current: <0.3 mA
Circular path diameter: 20 – 120 mm
Division spacing: approx. 20 mm
Tube diameter: approx. 160 mm