This is the page documenting the high voltage concepts that can be used for the f-SEM.

Since the f-SEM needs to be used in schools, we need a high voltage source that is children friendly and should not be harmful in any manner.

We need a stable 40kV(with a stability of around 100 parts per million) low capacity voltage source for the f-SEM. (e.g.10nA for 1000 hours)

We thought of three approaches to this:

Array of printed batteries

Van de Graaff Generator

Cockroft-Walton Multiplier circuit

Generating an electric arc(around 2kV) accomplished using multiplier circuit

Challenges

1. How can we measure a potential difference of 40 kV frugally?
2. How can we ensure that the smoothing capacitors we use are not lethal?