symmetry: Business in the particle accelerator world is booming, as is business at Advanced Energy Systems, where Tony Favale is president. His company is doing research and design work for the next generation of accelerators, which will be employed in electron lasers for the Navy, radiation detectors for the Department of Homeland Security, and more efficient particle colliders at US national laboratories.But of the seven positions he was advertising in November, three were still unfilled in mid-March because Favale can’t find enough qualified accelerator scientists.