Compact beam transport system for free-electron lasers driven by a laser plasma accelerator

Liu, Tao; Zhang, Tong; Wang, Dong; Huang, Zhirong

doi:10.1103/physrevaccelbeams.20.020701

Cited by 27 publications

(19 citation statements)

References 30 publications

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“…Dispersion effects on performance of free-electron laser based on laser wakefield accelerator We attempt to perform the EUV FEL operation by employing the attainable LWFA beam parameters from Shanghai Institute of Optics and Fine Mechanics (SIOM) [17,28,29] and the compact beam transport system considered in Ref. [30]. The parameters for the e beam at the entrance of the undulator are shown in Table 1.…”

Section: Dispersion Effects On Fel Radiationmentioning

confidence: 99%

Dispersion effects on performance of free-electron laser based on laser wakefield accelerator

Feng

Liu

et al. 2018

High Pow Laser Sci Eng

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In this study, we investigate a new simple scheme using a planar undulator (PU) together with a properly dispersed electron beam ($e$ beam) with a large energy spread (${\sim}1\%$) to enhance the free-electron laser (FEL) gain. For a dispersed $e$ beam in a PU, the resonant condition is satisfied for the center electrons, while the frequency detuning increases for the off-center electrons, inhibiting the growth of the radiation. The PU can act as a filter for selecting the electrons near the beam center to achieve the radiation. Although only the center electrons contribute, the radiation can be enhanced significantly owing to the high-peak current of the beam. Theoretical analysis and simulation results indicate that this method can be used for the improvement of the radiation performance, which has great significance for short-wavelength FEL applications.

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Section: Dispersion Effects On Fel Radiationmentioning

confidence: 99%

Dispersion effects on performance of free-electron laser based on laser wakefield accelerator

Feng

Liu

et al. 2018

High Pow Laser Sci Eng

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“…A TGU with a transverse magnetic field variation was initially proposed to improve FEL performance of an electron beam with a large energy spread [21,22] and being tested for FEL driven by laser plasma accelerator [23]. In this study, we make use of the dispersion generated by a TGU.…”

Section: A Beam Dynamics Of a Tgumentioning

confidence: 99%

Reversible beam heater for suppression of microbunching instability by transverse gradient undulators

Liu

Qin

Wang

et al. 2017

Phys. Rev. Accel. Beams

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The microbunching instability driven by beam collective effects in a linear accelerator of a free-electron laser (FEL) facility significantly degrades the electron beam quality and FEL performance. A conventional method to suppress this instability is to introduce an additional uncorrelated energy spread by laser-electron interaction, which has been successfully operated in the Linac Coherent Light Source and Fermi@Elettra, etc. Some other ideas are recently proposed to suppress the instability without increasing energy spread, which could benefit the seeded FEL schemes. In this paper, we propose a reversible electron beam heater using two transverse gradient undulators to suppress the microbunching instability. This scheme introduces both an energy spread increase and a transverse-to-longitudinal phase space coupling, which suppress the microbunching instabilities driven by both longitudinal space charge and coherent synchrotron radiation before and within the system. Finally the induced energy spread increase and emittance growth are reversed. Theoretical analysis and numerical simulations are presented to verify the feasibility of the scheme and indicate the capability to improve the seeded FEL radiation performance.

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“…ρ is normally of the orders of 10 −3 , so this condition is not acomplished by typical LPA beams since energy spreads have been measured to be~10 −2 for MeV-GeV [18]. In order to use these beams for FEL, the energy spread should be reduced, for example, by cutting a part of the initial distribution using a demixing chicane to select a smaller range of energies [19] or take advantage of the energy spread by opting for a different approach with the use of transverse gradient undulators (TGUs) [20,21]. The FEL amplification highly depends on the overlapping of the electron beam and the wave.…”

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confidence: 99%

Permanent Magnet-Based Quadrupoles for Plasma Acceleration Sources

et al. 2019

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The laser plasma accelerator has shown a great promise where it uses plasma wakefields achieving gradients as high as GeV/cm. With such properties, one would be able to build much more compact accelerators, compared to the conventional RF ones, that could be used for a wide range of fundamental research and applied applications. However, the electron beam properties are quite different, in particular, the high divergence, leading to a significant growth of the emittance along the transport line. It is, thus, essential to mitigate it via a strong focusing of the electron beam to enable beam transport. High-gradient quadrupoles achieving a gradient greater than 100 T/m are key components for handling laser plasma accelerator beams. Permanent magnet technology can be used to build very compact quadrupoles capable of providing a very large gradient up to 500 T/m. We present different designs, modeled with a 3D magnetostatic code, of fixed and variable systems. We also review different quadrupoles that have already been built and one design is compared to measurements.

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Compact beam transport system for free-electron lasers driven by a laser plasma accelerator

Cited by 27 publications

References 30 publications

Dispersion effects on performance of free-electron laser based on laser wakefield accelerator

Dispersion effects on performance of free-electron laser based on laser wakefield accelerator

Reversible beam heater for suppression of microbunching instability by transverse gradient undulators

Permanent Magnet-Based Quadrupoles for Plasma Acceleration Sources

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