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THOMSON TUBE SYSTEM 
Details

THOMSON TUBE SYSTEM

Objects
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 platecapacitor 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.


SYSTEM C1 - THOMSON TUBE IN MAGNETIC FIELD



SYSTEM COMPOSITON
1 pc
1 pc
1 pc
1 pc
1 pc
1 pc
Thomson tube
Helmholtz pair of coils
Tube holder
Tube base
DC power supply
DC power supply

P318002
P338002
P348001
P328003
M10-HV5000A
M10-QP500E



SYSTEM C2 - THOMSON TUBE IN ELECTRO STATIC FIELD




SYSTEM COMPOSITON
1 pc
1 pc
1 pc
1 pc
1 pc
Thomson tube
Tube holder
Tube base
DC power supply
DC power supply
P318002
P348001
P328003
M10-HV5000A
M10-QP500E


THOMSON TUBE P318002
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



P318002