DIY Vacuum Chamber
This is very simple to construct, and is made from low cost materials. The main chamber its self is the display case from a popular aftershave.
A bolt is inserted through the top of the plastic dome, and sealed with polymorph and rubberized glue. This bolt is used to allow electrical connection between the inside and the outside. A similar connection is made in the base of the chamber for a second electrode. The extraction pipe is also fitted in the base of the container.
The transparent dome can simply be lifted from the base (at normal pressure) and an o-ring is needed to seal it when the vacuum is on. The o-ring is simply placed in the groove for the dome with a bit of grease. If you can't find an o-ring of the right size, a belt from a tape player, printer, or record deck may do the trick.
Although this setup could not contain a hard vacuum, it is perfect for plasma experiments, and other tests. As with any homemade device, great care must be taken when using this vacuum chamber. This device could implode if care is not taken to limit the pressure level.
This image shows the centre electrode of an asymmetrical dipole. This arrangement allows particles to be accelerated to a central point from all directions and is often used in experimental fusion rectors. Advance fusion reactors use toroidal (dohnut shaped) vacuum chambers known as a Tokamak