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| MAS 587 | THOMSON TUBE IN MAGNETIC FIELD |
| SYSTEM COMPOSITON | ||
| 1 PC | Thomson tube | P318002 |
| 1 PC | Helmholtz pair of coils | P338002 |
| 1 PC | Tube holder | P348001 |
| 1 PC | Tube base | P328003 |
| 1 PC | DC power supply | M10-HV5000A |
| 1 PC | DC power supply | M10-QP500E |
| THOMSON TUBE SYSTEMObjects Thermionic emission of electrons Deflection of electrons in electron and magnetic field Estimate of specific change of an electron e/m Principles The Thomson 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 Thomson tube comprises an electron gun which emits a narrow, focused ribbon of cathode rays within an evacuated, clear glass bulb. A tungsten 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 the Helmholtz coils (P338002) magnetically. 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 millimeter graticule so that the path of the electrons can be easily traced. The mica sheet is held at 10 degree to the axis of the tube by the two deflecting plates. |
| THOMSON TUBE P318002 |  |
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| Filament voltage: Max. anode voltage: Anode current: Max. capacitor voltage: Tube diameter: Total length: Weight: |
6.3V AC 5000V approx. 0.1mA at 4000V 500V 130mm 245mm 0.3kg |