CERN magnet group has managed to break a new world record via the 16.2 tesla peak field achieved by its racetrack magnet during tests, a feat that is almost double what is produced by the LHC dipoles currently in use. Given its configuration, the LHC dipole magnet is the highest of its model.
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The Racetrack Model Coil (RMC) happens to be one of the demonstration test magnets that the CERN magnet group is constructing to gain true insights into how new technologies are to be developed, most especially as they relate to accelerators designed for the future.
Short magnets range from 1-2 meters long, but longer ones required for High-Luminosity LHC vary from 5-7 meters long. These need to be tested so as to determine their suitability for creating up to 16 tesla magnetic fields – which are what is needed for constructing future accelerators.
Juan Carlos Perez, an engineer at CERN and the project leader for the RMC, “The present LHC dipoles have a nominal field of 8.3T and we are designing accelerators which need magnets to produce a field of around 16T – almost twice as much.”
The most effective way to develop higher energy particle accelerators is with high-field magnets. A beam in orbit can only be guided by high magnetic fields, as can be seen with dipoles; but where high-gradient quadrupoles are concerned, then the beams might be squeezed just before they collide inside the experiment.
LHC requires niobium-titanium superconducting magnets to sharpen and bend beams of protons racing within the LHC, but the RMC needs something different – niobium-tin, which goes higher into magnetic fields.
The success just recorded with the High-Luminosity LHC project shows that the Future Circular Collider might be a great success in time to come.
"It is an excellent result, although we should not forget that this is a relatively small magnet, a technology demonstrator with no bore through the centre for the beam,” said Luca Bottura, head of CERN’s Magnet Group. “There is still a way to go before 16 Tesla magnets can be used in an accelerator. Still, this is a very important step towards them."
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It must however be pointed out that the RMC utilizes cables and wires as those used for the FRESCA2 – a 13T dipole magnet with a 100 mm aperture needed for upgrading the CERN’s FRESCA facility for cable testing. This will be tested in 2016.