MEXICO: Recently a compact particle accelerator broke energy echelon records when it’s extremely strong laser was used to move subatomic particles to jaw-dropping acceleration levels.
The particles reached their awe-inspiring speeds thanks to the use of a petawatt laser and plasma, a gas composed of charged prticles. In normal laboratory conditions, plasma accelerators have to stretch for several miles; however, thanks to emergent technologies that combine lasers with plasma acceleration can do so in the same kind of space needed for a game of table tennis.
The experiment involved taking a tube of plasma 9 centimeters long and filling it with the electrons to be spun up a speed of 4.25 giga-electron volts, something that required incredibly exacting control over both the plasma and the laser itself, according to the lead paper’s author Wim Leemans, Berkeley Lab’s Accelerator Technology and Applied Physics Division head. This is a far cry from the space needed for a traditional particle accelerator; CERN’s Large Hadron Collider, for instance, is a mind-boggling 17 miles long. However, the technique the LHC uses, with is modulating electric fields to speed up particles, tops out at around 100 mega-electron volts per meter before the equipment itself begins to degrade. Meanwhile, laser-plasma accelerators use a technique that creates much less wear and tear – as it’s just laser light shining through a plasma tube.
Berkeley Lab’s associate lab director for Physical Sciences James Symons said that the achievement Leemans has achieved is nothing short of extraordinary, especially with the results being achieved in the first operational campaign. The team could soon break its own record by accelerating the electrons even further, but this will need precision control in regards to the density of each plasma channel as the laser light is directed through them; scientists will have to create a perfect tunnel through the plasma for the pulsing laser light to blast through before higher-energy electrons can be sent through as well. When Leemans and his team will be ready to attempt to break their own record is unclear right now, as the calculations needed to revise the new accelerator technology are complex.
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