Author/Authors :
Jeong، نويسنده , , Young Uk and Lee، نويسنده , , Byung Cheol and Kim، نويسنده , , Sun Kook and Cho، نويسنده , , Sung Oh and Cha، نويسنده , , Byung Heon and Lee، نويسنده , , Jongmin and Vobly، نويسنده , , Pavel D. and Kolokolnikov، نويسنده , , Yuri M. and Mihaylov، نويسنده , , Stepan F. and Kulipanov، نويسنده , , Gennady N.، نويسنده ,
Abstract :
An equipotential-bus electromagnetic undulator has been developed for a far infrared compact free-electron laser. It has 2 m length, 5.6 mm gap, and 12.5 mm period. The field distribution along the undulator is formed by 2.25 mm thick poles of low-carbon steel with 4 mm thick Nd–Fe–B permanent magnets between them. The amplitude of the magnetic field is up to 6 kG. The variation of current allows us to vary the field amplitude within 10% in a constant gap. For the distribution of the peak amplitude along the undulator we obtained random r.m.s. deviation less than 0.5% without further field correction or individual adjustment of each iron pole or magnet.
