ADJUSTABLE PHASE INSERTION DEVICES AS X-RAY SOURCES

This is a presentation of the design principles for electron storage ring insertion devices whose gap is fixed but in which the rows of magnets move longitudinally with respect to each other. These devices are shown to perform in similar ways to adjustable gap insertion devices presently in use at synchrotron radiation laboratories, but to have significant advantages for new designs. The magnetic field, trajectories of electrons, and spectra of X-rays are calculated, and design considerations are discussed.