Create a working replica of a lightsaber

Understanding
If you used the handle to generate a strong magnetic field you could trap a plasma in the required sword-like shape. The plasma would be hot enough to melt through metal. This solves all of the issues with using lasers but the problem then becomes creating a magnetic trapping field with the correct shape using a structure that doesn't surround the plasma blade.

The required trapping effect might need to make use of other physical effects like optics, ultrasound or electrical arcs of current.

An arc of electric current that is sufficiently folded into a hairpin shape could act as the blade (like bending the loops of plasma that shoot out from the surface of the sun into a tight U-shape). The magnetic confinement would shape it into a straight blade.

The fact that two lightsabers clash with each other and thus cannot pass through each other could be due to the very strong magnetic repulsion that you create because of the trapping field which is so narrowly defined that it appears as if it's a solid structure.

If you had an electrical current passing through the air between two high voltage electrical contacts, you could deflect the path of the charge carriers upwards using a strong magnetic field placed between the two contacts (the Hall effect). This would deflect the arc of plasma into a slight U shape. If you took that to the extreme and perfected the shape with further magnetic fields you would create a tight hairpin shape and thus a blue lightsaber. The trick then would be to miniaturise the base which contains powerful magnets and a high voltage power supply.

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