Gigahertz repetition rate thermionic electron gun concept

Toonen, W. F.; Stragier, X.F.D.; Mutsaers, P.H.A.; Luiten, O.J.

doi:10.1103/physrevaccelbeams.22.123401

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…In combination with RF electron bunch chopping and compression techniques, the phase plate can be used to construct a pulsed, high repetition rate phase contrast microscope with an acceptable duty cycle. First chopping the electron beam in bunches and subsequently compressing these bunches in the time domain enables short electron pulses with an overall duty cycle of up to 30% [44]. However, time domain compression unavoidably introduces an energy spread in the electron beam.…”

Section: Discussionmentioning

confidence: 99%

“…Although shorter laser pulses are feasible, we have to realize that, in order to achieve approximately the same phase shift for all (unscattered) electrons in the pulsed electron beam, the electron pulse has to be significantly shorter than the laser pulse (as well as perfectly synchronized with it). Using RF-cavity based electron beam chopping and compression techniques [41][42][43][44][45], 30 fs pulses seem feasible, which would enable the use of a laser pulse with a width of 100 fs or more. The 300 fs pulse allows for longer electron pulses and puts less extreme demands on the synchronization.…”

Section: Required Pulse Energymentioning

confidence: 99%

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Feasibility of a Pulsed Ponderomotive Phase Plate for Electron Beams

Leeuwen

Schaap²,

Buijsse³

et al. 2023

New J. Phys.

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We propose a scheme for constructing a phase plate for use in an ultrafast Zernike-type phase contrast electron microscope, based on the interaction of the electron beam with a strongly focused, high-power femtosecond laser pulse and a pulsed electron beam. Analytical expressions for the phase shift using the time-averaged ponderomotive potential and a paraxial approximation for the focused laser beam are presented, as well as more rigorous quasiclassical simulations based on the quantum phase integral along classical, relativistic electron trajectories in an accurate, non-paraxial description of the laser beam. The results are shown to agree well unless the laser beam is focused to a waist size below a wavelength. For realistic (off-the-shelf) laser parameters the optimum phase shift of -π/2 is shown to be achievable. When combined with RF-cavity based electron chopping and compression techniques to produce electron pulses, a femtosecond regime pulsed phase contrast microscope can be constructed. The feasibility and robustness of the scheme are further investigated using the simulations, leading to motivated choices for design parameters such as wavelength, focus size and polarization.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Required Pulse Energymentioning

confidence: 99%

Feasibility of a Pulsed Ponderomotive Phase Plate for Electron Beams

Leeuwen

Schaap²,

Buijsse³

et al. 2023

New J. Phys.

View full text Add to dashboard Cite

show abstract

“…In combination with RF electron bunch chopping and compression techniques, the phase plate can be used to construct a pulsed, high repetition rate phase contrast microscope with an acceptable duty cycle. First chopping the electron beam in bunches and subsequently compressing these bunches in the time domain enables short electron pulses with an overall duty cycle of up to 30% [18]. However, time domain compression unavoidably introduces an energy spread in the electron beam.…”

Section: Discussionmentioning

confidence: 99%

“…Although shorter laser pulses are feasible, we have to realize that, in order to achieve approximately the same phase shift for all (unscattered) electrons in the pulsed electron beam, the electron pulse has to be significantly shorter than the laser pulse (as well as perfectly synchronized with it). Using RF-cavity based electron beam chopping and compression techniques [15][16][17][18][19], 30 fs pulses seem feasible, which would enable the use of a laser pulse with a width of 100 fs or more. The 300 fs pulse allows for longer electron pulses and puts less extreme demands on the synchronization.…”

Section: A Required Pulse Energymentioning

confidence: 99%

Feasibility of a Pulsed Ponderomotive Phase Plate for Electron Beams

Leeuwen¹,

Schaap²,

Buijsse³

et al. 2022

Preprint

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We propose a scheme for constructing a phase plate for use in an ultrafast Zernike-type phase contrast electron microscope, based on the interaction of the electron beam with a strongly focused, high-power femtosecond laser pulse and a pulsed electron beam. Analytical expressions for the phase shift using the time-averaged ponderomotive potential and a paraxial approximation for the focused laser beam are presented, as well as more rigorous quasiclassical simulations based on the quantum phase integral along classical, relativistic electron trajectories in an accurate, non-paraxial description of the laser beam. The results are shown to agree well unless the laser beam is focused to a waist size below a wavelength. For realistic (off-the-shelf) laser parameters the optimum phase shift of −π/2 is shown to be achievable. When combined with RF-cavity based electron chopping and compression techniques to produce electron pulses, a femtosecond regime pulsed phase contrast microscope can be constructed. The feasibility and robustness of the scheme are further investigated using the simulations, leading to motivated choices for design parameters such as wavelength, focus size and polarization.

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“…Without appropriately chirping the laser frequency [34][35][36][37], the non-linear effects limit upscaling of the photon yield with laser intensity. To certain extent, the yield can be linearly increased by interaction length [13] or by charge [38,39].…”

Section: Basic Properties Of Icsmentioning

confidence: 99%

Photon yield of superradiant inverse Compton scattering from microbunched electrons

et al. 2022

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Compact X-ray sources offering high-brightness radiation for advanced imaging applications are highly desired. We investigate, analytically and numerically, the photon yield of superradiant inverse Compton scattering from microbunched slectrons in the linear Thomson regime, using a classical electrodynamics approach. We show that for low electron beam energy, which is generic to inverse Compton sources, the single electron radiation distribution does not match well to collective amplification pattern induced by a density modulated electron beam. Consequently, for head-on scattering from a visible laser, the superradiant yield is limited by the transverse size of typical electron bunches driving Compton sources. However, by simultaneously increasing the electron beam energy and introducing an oblique scattering geometry, the superradiant yield can be increased by orders of magnitude.

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Gigahertz repetition rate thermionic electron gun concept

Cited by 9 publications

References 23 publications

Feasibility of a Pulsed Ponderomotive Phase Plate for Electron Beams

Feasibility of a Pulsed Ponderomotive Phase Plate for Electron Beams

Feasibility of a Pulsed Ponderomotive Phase Plate for Electron Beams

Photon yield of superradiant inverse Compton scattering from microbunched electrons

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