Abstract
A permanent dipole magnet with variable magnetic field has been designed, fabricated, and tested at SPring-8. Permanent magnet can be advantageous over electromagnet in terms of power consumption, stability and reliability etc. One of critical issues to apply permanent magnets to future light sources and other accelerators is that the magnetic field should be somehow tuned. In designing future light sources, combined-function or longitudinal gradient magnet may play a key role in achieving extremely small emittance. Therefore, it may not be appropriate to change a gap for changing the field. We have proposed an alternative way to tune the magnetic field of permanent magnet by using outer plates, and the performance has been investigated.
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