Step-tapered operation of the FEL: efficiency enhancement and two-colour operation

Jaroszynski, D. A.; Prazérès, R.; Glotin, F.; Marcouillé, Olivier; Ortéga, J.M.; Oepts, D.; Meer, A. F. G. van der; Knippels, G.M.H.; Amersfoort, P.W. van

doi:10.1016/0168-9002(95)01466-7

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…One way to alter the undulator design is to introduce taper. Taper may be achieved by varying the magnetic field along the undulator, and it has been shown that positively and negatively tapered undulators have characteristics that can be advantageous for particular applications in strong optical fields [2][3][4][5][6][7][8]. Recently, Thomas Jefferson National Accelerator Facility (TJNAF) has experimentally explored many properties of the same FEL with no taper, positive taper, and negative taper [9].…”

Section: Introductionmentioning

confidence: 99%

Simulations of the TJNAF FEL with tapered and inversely tapered undulators

Christodoulou

Lampiris

Colson

et al. 2001

Nuclear Instruments and Methods in Physics Research Section A:

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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. r

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Section: Introductionmentioning

confidence: 99%

Simulations of the TJNAF FEL with tapered and inversely tapered undulators

Christodoulou

Lampiris

Colson

et al. 2001

Nuclear Instruments and Methods in Physics Research Section A:

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show abstract

“…FEL operation has already demonstrated very narrow line operation by utilizing coupled cavities to tighten the spectrum [107]. Methods have also been found which permit the FEL to lase at multiple frequencies simultaneously, either near by [108] or on harmonics [109] or with synchronous use of synchrotron emission [110]. To deal with the high optical cavity power a group has proposed using an initial low power oscillator to bunch the beam which then provides high gain and extraction in a second wiggler [57].…”

Section: Miscellaneous Approachesmentioning

confidence: 99%

Free-electron lasers: vacuum electronic generators of coherent radiation

Freund

Neil²

1999

Proc. IEEE

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Vacuum electronic sources have shown marked improvement since the invention of the magnetron before World War II, and dramatic increases in both average powers and frequencies have been achieved. Of course, much of these gains have been achieved by the development of different devices. The typical development pattern for a given device exhibits an initial period of rapid improvement followed by a plateau determined by technological or physical limitations on the concept. Slow wave devices such as magnetrons and/or klystrons operate efficiently at frequencies up through X-band or he source of the relation ed cavity traveling wave tubes are used for various applications at frequencies ranging up through W-band. At still higher frequencies fast wave devices such as gyrotrons and free-electron lasers are required are required for high power operation.The free-electron laser concept is unique in that the mechanism is applicable across the entire electromagnetic spectrum, and free-electron lasers have been built at wavelengths from microwaves through the ultraviolet, and plans are under development for X-ray systems. Our purpose of this paper is to describe the principal directions of free-electron laser research at the present time. To this end, we first give a brief tutorial of the physics underlying the concept, and then describe the principal development paths under way.

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Accelerator Sources for THz Science: A Review

Neil

2013

J Infrared Milli Terahz Waves

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Step-tapered operation of the FEL: efficiency enhancement and two-colour operation

Cited by 8 publications

References 19 publications

Simulations of the TJNAF FEL with tapered and inversely tapered undulators

Simulations of the TJNAF FEL with tapered and inversely tapered undulators

Free-electron lasers: vacuum electronic generators of coherent radiation

Accelerator Sources for THz Science: A Review

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