Start Current and Gain Measurements for a Smith-Purcell Free-Electron Laser

Gardelle, J.; Modin, P.; Donohue, J.T.

doi:10.1103/physrevlett.105.224801

Cited by 33 publications

(7 citation statements)

References 14 publications

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“…It should be mentioned that the effect studied here is different from the Smith- Purcell radiation (SPR) effect. It is well known that when a relativistic electron flies along a periodic metal grating surface, the electromagnetic radiation modes will be produced due to the interaction between the electron and grating (the peak radiation wavelength is comparable with the grating period) 26 27 28 . But here, the relativistic electrons couple strongly with the bounded electromagnetic surface mode, i.e., the SSP mode confined on the subwavelength gradient metasurfaces (In practice, the length of metasurface is finite.…”

Section: Discussionmentioning

confidence: 99%

Enhancing spoof surface-plasmons with gradient metasurfaces

Huang

Liu

et al. 2015

Sci Rep

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The coupling between surface plasmons and free electrons may be used to amplify waves or accelerate particles. Nonetheless, such an interaction is usually weak due to the small interaction length or velocity mismatching. Here a mechanism for enhancing the coupling between plasmonic fields and relativistic electrons is proposed. By using a weakly gradient meta-surface that supports the spoof surface-plasmons (SSP), the phase velocity of SSP mode can be manipulated and quasi-velocity-matching between SSP and electrons may be achieved. The dynamic coupling equations suggest that, due to the strong coupling, the energy can be extracted continuously from the relativistic electrons. The sustained increase of SSP in a narrow frequency band has been demonstrated by the particle-in-cell simulations, where the output power of SSP attains 65 W at 1 THz (with 28 mm interaction length) and the coupling efficiency is enhanced by two orders of magnitude. The results may find potential applications for designing new compact and efficient THz wave sources.

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Section: Discussionmentioning

confidence: 99%

Enhancing spoof surface-plasmons with gradient metasurfaces

Huang

Liu

et al. 2015

Sci Rep

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“…This is necessary for stable operation of the SP FEL. Although such an external magnetic field is not used in the experiments in References [1,4], an external magnetic field of 0.3 to 0.5 T is used for experiments at the Center for Scientific and Technical Study of Aquitaine (Cesta) in France [5,13,14]. We need to rearrange our experimental setup to add a permanent solenoid magnet similar to that used for laser-accelerated electron beams [15] near the grating.…”

Section: Preparation For Sp Fel Experimentsmentioning

confidence: 99%

Development of a Multialkali Photocathode Dc Gun for a Smith-Purcell Terahertz Free-Electron Laser

et al. 2018

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Abstract:We have developed a photocathode dc gun for a compact Smith-Purcell free-electron laser in the terahertz wavelength region. The gun system consists of an alkali antimonide photocathode preparation chamber, a dc gun with a 250 kV-50 mA Cockcroft-Walton high-voltage power supply, and a downstream beamline with a water-cooled beam dump to accommodate a beam power of 5 kW. We fabricated a Cs 3 Sb photocathode with quantum efficiency of 5.8% at a wavelength of 532 nm and generated a 150 keV beam with current of up to 4.3 mA with a 500 mW laser. A vacuum chamber for the Smith-Purcell free-electron laser has been installed in the downstream beamline. We describe the present status of our work.

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“…8,9 More recently, there have been much interest in coherent Smith-Purcell free-electron devices that can be useful as compact tunable sources for coherent Millimeter-wave, THz, and infrared radiation. [10][11][12][13][14][15][16] Laser-solid target interaction at the terawatt level can produce fs pulses of MeV electrons at current densities as large as 10 12 A=cm 2 , which is far beyond the peak current density achievable used in traditional SPR experiments. However, it is difficult to produce intense coherent radiation using these electron pulses because of their finite temperature and spatial divergence.…”

Section: Introductionmentioning

confidence: 99%

Strong mid-infrared radiation from self-guided fast electron bunch propagating along a grated target surface in laser-solid interaction

Kodama

2012

Physics of Plasmas

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Generation of 10 12 W=cm 2 Smith-Purcell radiation in the infrared (5À20 lm) regime from the interaction of high-density laser-produced MeV electrons is proposed. The electron bunch is produced by impinging an intense ultrashort laser pulse on a metallic target with a grated upper surface. Particle-in-cell simulation shows that the electron bunch can efficiently couple to the periodic structure through the quasistatic self-generated electric and magnetic fields there. An analytical model for predicting the dependence of the radiation intensity on the laser and grating parameters is also proposed. With appropriate laser and grating parameters, the proposed scheme provides a tunable source for intense radiation in the infrared regime. V C 2012 American Institute of Physics. [http://dx.

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Start Current and Gain Measurements for a Smith-Purcell Free-Electron Laser

Cited by 33 publications

References 14 publications

Enhancing spoof surface-plasmons with gradient metasurfaces

Enhancing spoof surface-plasmons with gradient metasurfaces

Development of a Multialkali Photocathode Dc Gun for a Smith-Purcell Terahertz Free-Electron Laser

Strong mid-infrared radiation from self-guided fast electron bunch propagating along a grated target surface in laser-solid interaction

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