Tiniest particle accelerator is so small it could fit into a pen tip

A particle accelerator that measures just 0.2 mm in length uses laser light to accelerate electrons to speeds of a hundred thousand kilometres per second

A particle accelerator just 0.2 millimetres long is the smallest device of its kind ever built. It is the first tiny accelerator that can produce fast and well-focused bunches of electrons and could eventually be incorporated into a pen tip for use in medicine.for treating cancer speed up particles with electric fields and magnets. Those electric fields are typically generated using radio-frequency waves that have wavelengths measured in metres or centimetres.

They made it from silicon shaped into thousands of 2-micrometre-tall pillars that were arranged into two parallel lines, each 0.2 millimetres long. To run the accelerator, the researchers shone laser light on this pillar-lined “runway” from above while injecting electrons into it from the side.

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