Tube deflection e/m D

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The electron-beam deflection tube is intended for investigating the deflection of electron beams in electrical and magnetic fields. It can be used to estimate the specific charge of an electron e/m and to determine the electron velocity v. The electron-beam deflection tube comprises an electron gun which emits a narrow, focussed ribbon of cathode rays within an evacuated, clear glass bulb. A tungsten 'hairpin' filament hot cathode is heated directly and the anode takes the form of a cylinder. The deflection of rays can be achieved electrostatically by means of a built-in plate capacitor formed by the pair of deflection plates, or magnetically with the help of Helmholtz Coils (XAR 060 020). The cathode rays are intercepted by a flat mica sheet, one side of which is coated with a fluorescent screen and the other side of which is printed with a centimetre graticule so that the path of the electrons can be easily traced. The mica sheet is held at 15° to the axis of the tube by the two deflecting plates.
• Filament Voltage:  7.5V AC/DC  
• Anode Voltage: 1000V to 5000V DC
• Anode Current: typ. 1 mA  
• Deflector Voltage: 5000V max  
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DescriptionDeflection e/m Tube
UN Class//