3B Scientific 1019957 Fine Beam Tube on Connection Base R

For examining the deflection of electron beams in a uniform magnetic field using a pair of Helmholtz coils (1000906) and for the quantitative determination of the specific charge of the electron e/m. Glass vessel with integrated electron beam system, consisting of an indirectly heated oxide cathode, a Wehnelt cylinder and a perforated anode, in neon residual gas atmosphere with precisely set gas pressure and with integrated measurement marks for parallax-free determination of the diameter of the fine beam. Gas atoms are ionized along the electron path and Produce a sharply defined, visible fluorescent beam. Tube mounted on base with colour coded connectors.

Features:

• Gas filling: Neon
• Gas pressure: 1.3x10^-5 hPa
• Filament voltage: 5 - 7 V DC
• Filament current: < 150 mA
• Wehnelt voltage: 0 - -50 V
• Anode voltage: 200 - 300 V
• Anode current: <0.3 mA
• Circular path diameter: 20 - 120 mm