Tabletop accelerator shoots cheap antimatter bullets
http://www.newscientist.com/article/dn23748-tabletop-accelerator-shoots-cheap-antimatter-bullets.html?cmpid=RSS%7CNSNS%7C2012-GLOBAL%7Conline-news&
A tabletop device just 10 square metres in size can spit out energetic bursts of positrons as dense as those kicked out by the giant particle-factories at CERN...
Instead, Gianluca Sarri at Queen's University Belfast, UK, and colleagues used rapid laser bursts to make positrons in their smaller, budget device. The laser pulse ionises inert helium gas, generating a stream of high-speed electrons. This electron beam is directed at a thin metallic foil so that it crashes into metal atoms, releasing a jet of electrons and positrons. These particles are separated into two beams with magnets...
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