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FINE BEAM TUBE SYSTEM 
Details

Objects
Deflection of electrons in a closed circular path inside a magnetic field
Determination of specific change of an electron e/m


Principles
The fine beam tube is used for investigating the deflection of cathode rays in a uniform
magnetic field produced by a pair of Helmholtz coils (P338001). In addition, it can also be used for quantitative determination of the specific charge of an electron e/m.

Located inside a glass bulb with a helium residual gas atmosphere is an electron gun, which
consists of an indirectly heated oxide cathode, a Wehnelt cylinder and a perforated anode. The gas atoms are ionized along the path of the electrons and a narrow, well-defined, luminescent beam is produced. Incorporated measurement marks facilitate a parallax-free determination of the diameter of the circular path of the beam deflected in the magnetic field.


SYSTEM A - BASIC FINE BEAM TUBE SYSTEM


SYSTEM COMPOSITON
1 pc
1 pc
1 pc
1 pc
Fine beam tube
Fine beam tube base
Helmholtz pair of coils
DC power supply
P318001
P328001
P338001

M10-QP500E


SYSTEM B - COMPLETE FINE BEAM TUBE SYSTEM


 Video on youtube


SYSTEM COMPOSITON

1 pcfine beam tubeP318001
1 pcfine beam tube base+ Helmholtz pair of coilsP328002
1 pcDC power supplyM10-SPN300-03C
1 pcDC power supplyM10-SPN110-01C
1 pcDC power supplyM10-SPM18-3C


FINE BEAM TUBE P318001

Gas filling:
Gas pressure:
Filament voltage:
Filament current:
Focus voltage:
Anode voltage:
Anode current:
Circular path diameter:
Division spacing:
Tube diameter:
Total length:
Weight:
Helium
1.3hPa
4~10V AC/DC
600mA at 6.3V
-50V
200~300V
<0.3mA
20~100mm
10mm
160mm
255mm

0.35kg