It was designed by Vande graff in the year 1931
PRINCIPLE- The generator is based on –
1- The action of sharp points i.e, phenomenon of CORONA DISCHARGE
2- The property that charge is given to a hollow conductor is transferred to outer surface and distributed informally over it.
It is machine capable of building up a potential difference of few million volts & field close to the break down field of air which is about 3×108 V/m
A large spherical conducting shell (few meters radius ) is supported at height several meters above the ground on the insulating column.
A long narrow endless belt insulating material like rubber or silk is wound around two pulleys . One at ground level , one at the centre of the shell. This belt is kept continuously moving by motor driving the lower pulley . It continuously carries positive sprayed on to it by a brush at ground level to the top up. There it transfers its positive charge to another conducting brush connected to the large shell. Thus the positive charge is transferred to the shell where it spread out on the outer surface.
Application- Accelerated positive charge are used to carried out nuclear reactions.
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