A high-quality strong-field hybrid undulator has been designed for an infrared FEL project to be performed at UCLA. The primary magnetic flux is provided by C-shaped vanadium-permendur yokes and SmCo_5 magnets. An additional magnetic flux is supplied by thin NdFeB magnet blocks placed between the yoke poles. This magnet geometry provides a high saturation limit for the magnetic field in the gap area. With the 15 mm period and 5 mm gap a peak on-axis field of 7.3 kG has been achieved. The undulator contains 40 periods. The high accuracy of the yoke poles alignment along with the ability to move the thin permanent magnet blocks provides an on-axis magnetic field accuracy better than 0.5%. (9 References). 346 13th International Free Electron Laser Conference /home/httpd/docserver/releases/20080613005430/public/paper/file/498/varfolomeev_1991_0281.pdf varfolomeev_1991_0281.pdf 3 498 Free electron lasersInfrared sourcesPermanent magnetsWigglersBeam handling, focusing, pulsing, stripping and diagnostics [A2925F], Free electron lasers [A4255T], Particle beam handling and diagnostics [B7410B], Free electron lasers [B4320K], Permanent magnets [B3120E]free electron laser, short-period undulator design, strong-field hybrid undulator, infrared FEL project, C-shaped vanadium-permendur yokes, magnetic flux, yoke poles alignment, permanent magnet blocks, 5 mm, 15 mm, SmCo/sub 5/ magnets, NdFeB magnet blocks 3 1992 Nuclear Instruments & Methods A, vol. 318 281 2007-07-27T23:53:33-07:00 813-17 1991