BERKELEY, Calif., Feb. 19 -- The nation's premier source of low-energy, or "soft," X-rays for scientific and technological purposes may also become a premier source of T-rays, or far-infrared or terahertz frequency (trillion-cycle-per-second) radiation. Plans to build a new synchrotron ring dedicated to generating high-powered T-ray beams at Berkeley Lab's Advanced Light Source (ALS) are moving forward, thanks in part to a recent collaborative experiment at the Thomas Jefferson Accelerator Facility. 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