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        Simulations of the TJNAF FEL with tapered and inversely tapered undulators

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        Author
        Christodoulou, A.
        Lampiris, D.
        Colson, W.B.
        Crooker, P.P.
        Blau, J.
        McGinnis, R.D.
        Benson, S.V.
        Gubeli, J.F.
        Neil, G.R.
        Date
        2001
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        Abstract
        Experiments using the TJNAF FEL have explored the operation with both tapered and inversely tapered undulators. We present here numerical simulations using the TJNAF experimental parameters, including the effects of taper. Singlemode simulations show the effect of taper on gain. Multimode simulations describe the evolution of short optical pulses in the far infrared, and show how taper affects single-pass gain and steady-state power as a function of desynchronism. A short optical pulse presents an ever-changing field strength to each section of the electron pulse so that idealized operation is not possible. Yet, advantages for the recirculation of the electron beam can be explored.
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        http://hdl.handle.net/10945/44079
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