LAST MAY, APPROXIMATELY four years after construction started at the Stanford Linear Accelerator Center, a beam traveled the entire two‐mile length of the accelerator from an injector at the west end to a beam dump at the east end. This machine is distinguished not only by its length and high energy (20 GeV); it also produces high current (30 microamperes), exceeding by a factor of 100 that of any other machine operating with an energy greater than 10 GeV. Moreover the design permits future expansion (from stage I to stage II) that will double both energy and current by adding radiofrequency sources along the length. Details of the design evolution appear in references 1–5.
The Stanford two‐mile linac produces up to six beams. The unusually high current and high energy can be doubled by future expansion.