Wiggler focused relativistic sheet beam propagation in a planar free-electron laser configuration

Radack, D.J.; Booske, J.H.; Carmel, Y.; Destler, W.W.

doi:10.1063/1.102108

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…The triangle is enclosed by: 0 q 0:91; 0 a 1; a À1:1q þ 1. Combining Eqs.16, 17, the conditions are written: For illustration purposes, the beam considered in this paper is a sheet beam with the major axis r x =2.5 mm, the minor axis r y =0.5 mm, the beam current I=20A and the beam voltage U 0 =120KV [6,[13][14][15]18]. So: v b ¼ 1:76 Â 10 8 m=s ð21Þ…”

Section: Theoretical Analysismentioning

confidence: 99%

“…and numerical studies have shown that stable transport of sheet beams without diocotron mode is possible, when sheet beam is transported in periodic permanent magnetic (PPM) fields, which include periodically cusped magnet (PCM) fields and wiggler fields [7][8][9][10][11][12][13].…”

mentioning

confidence: 99%

“…The clear conditions for stable sheet beam transport in PPM fields is very urgent and has been investigated for a long time [7][8][9][10][11][12][13][14][15][16][17]. By neglecting the influence of space-charge field and cyclotron motion, the previous works got vague conditions for stable sheet beam transport.…”

mentioning

confidence: 99%

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The Conditions for Stable Sheet Electron Beams Transport in Periodic Permanent Magnet Fields

Wang

Gong

Wei

et al. 2010

J Infrared Milli Terahz Waves

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The stable focusing or transport of sheet electron beams is an essential technology for an emerging class of high-power high-frequency planar-structure microwave devices. This paper, in consideration of space-charge field and cyclotron motion, describes theoretical study and simulation on sheet beams transport in periodic permanent magnetic (PPM) fields. Based on the theoretical study, we obtain the clear conditions for the stable sheet beams transport in PPM field. And the three-dimensional simulations of the sheet beam transport are in good agreement with our theoretical study. Our research will be useful in further study and experimental.

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Section: Theoretical Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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The Conditions for Stable Sheet Electron Beams Transport in Periodic Permanent Magnet Fields

Wang

Gong

Wei

et al. 2010

J Infrared Milli Terahz Waves

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“…7, it is clear that while this is a safe assumption for the double-anode beam, space charge expansion may play an important role in the body current for the single-anode beam, even at wiggler field strengths approaching 2 kG. These experiments are discussed further in [30].…”

Section: Note That Inmentioning

confidence: 99%

Design of high-average-power near-millimeter free electron laser oscillators using short period wigglers and sheet electron beams

Booske

Radack

Antonsen

et al. 1990

IEEE Trans. Plasma Sci.

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Abstract-The design and feasibility of a I-MW continuous wave (CW) free electron laser (FEL) oscillator are reviewed. The proposed configuration will include a short-period (1" -I c m ) planar wiggler. a sheet electron beam, a 0.5-1.0 MV thermionic electron gun, a hybrid waveguide/quasi-optical resonator, commercial de power supplies, and a depressed collector. Cavity ohmic R F losses are estimated to be extremely low ( 5 10-100 W / c m * ) at I-MW output power, while thermal heat transfer studies conservatively indicate that wall cooling up to 1500 W /cm' should be possible. Experiments have convincingly verified theory and simulations which predict that negligible body currents will be achievable with low-emittance low-space-charge sheet beams. Highvoltage sheet beam gun design studies indicate that the required beam quality can be achieved with CW compatible devices. The spent beam energy distribution is consistent with highly efficient spent beam energy recovery, and the proposed resonator cavity should provide mode discrimination and beam/RF separation capability. Finally, recent advances in superconducting wiggler designs suggest that even more compelling improvements in FEL design are possible. Specifically, the substantially increased dc wiggler fields can yield better beam confinement. ter.

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“…The electron gun design, although consistent with electron guns that have been or are currently operating (17,18,24,26), must be addressed. The possibility of tailoring the beam impedance to vary commensurately with the gap impedance of the cavities must also be addressed, and the complexities involved weighed against the elaborate output cavity coupling schemes required to maintain a high degree of field flatness.…”

Section: Future Directionsmentioning

confidence: 99%

W-band sheet beam klystron simulation

Colby

Caryotakis

Fowkes

et al. 1999

AIP Conference Proceedings

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Abstract. With the development of ever higher energy particle accelerators comes the need for compactness and high gradient, which in turn require very high frequency high power rf sources. Recent development work in W-band accelerating techniques has spurred the development of a high-power W-band source. Axisymmetric sources suffer from fundamental power output limitations (P sat~λ 2 ) brought on by the conflicting requirements of small beam sizes and high beam current. The sheet beam klystron allows for an increase in beam current without substantial increase in the beam current density, allowing for reduced cathode current densities and focussing field strengths. Initial simulations of a 20:1 aspect ratio sheet beam/cavity interaction using the 3 dimensional particle-in-cell code Magic3D have demonstrated a 35% beam-power to RF power extraction efficiency. Calculational work and numerical simulations leading to a prototype W-band sheet beam klystron will be presented, together with preliminary cold test structure studies of a proposed RF cavity geometry.

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Wiggler focused relativistic sheet beam propagation in a planar free-electron laser configuration

Cited by 19 publications

References 8 publications

The Conditions for Stable Sheet Electron Beams Transport in Periodic Permanent Magnet Fields

The Conditions for Stable Sheet Electron Beams Transport in Periodic Permanent Magnet Fields

Design of high-average-power near-millimeter free electron laser oscillators using short period wigglers and sheet electron beams

W-band sheet beam klystron simulation

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