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Large Magnetic Fields in Small SpacesThe Search and Discovery story about hypermagnetized neutron stars (PHYSICS TODAY, May 2005, page 19) says that 1016 G is the strongest magnetic field found anywhere in nature or in the laboratory. The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory now produces magnetic fields of 8 × 1018 G. RHIC creates collisions between two 100-GeV beams of gold ions. The magnetic field midway between two gold nuclei that are passing at a distance of 20 fm so that there are no nuclear interactions is 8 × 1018 G. Within two years the Large Hadron Collider at CERN will smash lead ions together with a total energy of 1000 TeV. The magnetic field there will be 2 × 1020 G. The volume of these magnetic fields is small compared to that in a star, but it is still large enough for elementary-particle studies. As pointed out in the story, the large fields are interesting because they are greater than 4 × 1013 G, the critical quantum-electrodynamic field strength at which the vacuum becomes strongly birefringent and displays a number of interesting effects involving photons and electrons. Edwin Norbeck
University of Iowa
Iowa City
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