FABRICATION OF HIGH-FIELD SHORT-PERIOD PERMANENT-MAGNET WIGGLERS

A permanent magnet wiggler is described that has been designed to lase at unusually short wavelengths. Its novel features include the follow ing: all magnets are magnetized parallel to the wiggler's axis; only t wo pairs per period are used; the gap occupied by the electron beam is very small; the magnet arrangement is optimized for lasing on the thi rd harmonic; the assembly of the magnets is carried out during continu ous measurements of the field integrals; field gradients are measured with equal care; and residual errors are corrected by gluing small cor recting magnets to appropriate places. The assembly, testing, and trim ming of this wiggler was accomplished in less than a week. The wiggler has been used to lase successfully at 0.375 mum wavelength.