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A 70-period high-precision microwiggler for free electron lasers

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2 Author(s)
Stoner, R. ; Dept. of Phys., MIT, Cambridge, MA, USA ; Bekefi, G.

We have designed, constructed, and operated a 70-period microwiggler for free electrons lasers (FEL's). The device is a pulsed ferromagnetic-core electromagnet with a period of 8.8 mm, which generates an on-axis peak magnetic field of 4.2 kG. The pulses, of 0.5 ms duration, are generated at a rate of 0.5 Hz. Each field peak is independently tunable. We employed a novel tuning regimen to reduce the RMS spread in the peak amplitudes to 0.12%, the lowest value thus far attained in a sub-cm-period periodic magnetic field

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Quantum Electronics, IEEE Journal of  (Volume:31 ,  Issue: 6 )