|Heinrich Greinacher but named after John Douglas Cockcroft and Ernest Thomas Sinton Walton
|Robert J. Van de Graaff
|Year of invention
|Method of charging
|Generates a high DC voltage from a low-voltage AC or pulsing DC input by using a cascade of diodes and capacitors
|Uses a moving belt to accumulate electric charge on a hollow metal globe via two rollers of differing materials using the Triboelectric effect
|Roughly Dependant on AC input voltage to the multiplier times the number stages. Each stage is 2 capacitors and 2 diodes.
|Dependant on the diameter of the sphere and distance from any earthed objects.
|Roughly Dependant on the input current to the multiplier times 1/ the number of multiplying stages.
|Dependant on the speed of the motor and the width of the charging belt.
|High reliability, no moving parts, not susceptible to dirt or moisture
|Simple construction, easily scalable.
|Large losses when scaling up for voltage, Complex, Electronics easily damaged by electrical discharges
|Dirt & moisture affects operation. Unreliable without regular maintenance, Belt wears out over time.