CONTROLLING OF MAGNETIC FIELD INTENSITY IN MAGNETIC CIRCUIT FOR INSERTION LIGHT SOURCE

摘要

PURPOSE:To obtain very good radiation light by providing a ferromagnetic material piece on the opposite surface of plural rectangular parallelopipedon segment magnets in an undulator. CONSTITUTION:In a magnetic circuit for insertion light source arranging face to face a plurality of rectangular parallelopipedon segment parmanent magnets 22, 24, a ferromagnetic material piece 12 (sphere or multigonal body) is provided as to face to the rectangular parallelopipedon segment parmanent magnet pair. Thus without moving each parmanent magnet, the magnetic field formed in the gap between the facing parmanent magnets is controlled.