Title :
Wedge-shaped, large-aperture, dipole magnet designs for the Jefferson Lab FEL upgrade
Author :
Newsham, D. ; Smirnov, A. ; Luo, Y. ; Yu, D. ; Biallas, G.
Author_Institution :
DULY Res. Inc., Rancho Palos Verdes, CA, USA
Abstract :
Two types of dipole magnets were simulated and designed for the Thomas Jefferson National Accelerator Facility FEL upgrade. The magnets are to operate in series with a common power supply, and to provide ∼0.01% accuracy of the field amplitude and field integral over a large aperture. The wedged magnets have quite different angles and effective length-to-aperture aspect ratios. The most difficult design problem was to provide high field quality in the magnet having a small aspect ratio ∼2.7 and a 20° wedge angle. A design was developed which enabled small adjustments to be made before and after installation of the magnets. Trim coils, shims, and side sliders in the field clamps were introduced to compensate field gradients, non-uniformities, and parasitic fringe field effects. A number of design and adjustment issues are discussed.
Keywords :
accelerator magnets; beam handling techniques; free electron lasers; particle beam dynamics; power supplies to apparatus; Jefferson Lab FEL upgrade; dipole magnet designs; effective length-to-aperture aspect ratios; field clamps; field gradients; parasitic fringe field effects; power supply; shims; side sliders; trim coils; wedge angle; wedged magnets; Apertures; Clamps; Coils; Electrons; Magnetic analysis; Magnetic materials; Optical design; Permeability; Power lasers; Power supplies;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1288804
