Corrigendum to ‘Development and conditioning of the high current ion source for the EAST neutral beam injector’ [Nucl. Instrum. Methods Phys. Res. A 727 (2013) 29–32]

Xie, Yahong; Hu, Chundong; Liu, Sheng; Liang, Lizhen; Xu, Yuanyuan; Jiang, Caichao; Peng, Sheng; Li, Jun; Liu, Zhimin

doi:10.1016/j.nima.2013.09.058

Cited by 11 publications

(17 citation statements)

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“…These effects will lead to a longer gain length . Fitting formulas available in the literature [14] allow one to calculate Λ. The energy-spread contribution to Λ is found [14] to be .…”

Section: Lpa E-beam Manipulation For Free-electron Lasermentioning

confidence: 99%

“…Fitting formulas available in the literature [14] allow one to calculate Λ. The energy-spread contribution to Λ is found [14] to be . With ρ typically of order 10 -3 , the 3D gain length becomes unacceptably long for few-% energy spread electron beams (1-2 orders of magnitude longer than the 1D gain length).…”

Section: Lpa E-beam Manipulation For Free-electron Lasermentioning

confidence: 99%

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Free-electron lasers driven by laser plasma accelerators

Tilborg

Barber

Isono

et al. 2017

AIP Conference Proceedings

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Abstract. Laser-plasma accelerators (LPAs) have the potential to drive compact free-electron lasers (FELs). Even with LPA energy spreads typically at the percent level, the e-beam brightness can be excellent, due to the low normalized emittance (<0.5 μm) and high peak current (multi-kA) resulting from the ultra-short e-beam duration (few fs). It is critical, however, that in order to mitigate the effect of percent-level energy spread, one has to actively manipulate the phase-space distribution of the e-beam. We provide an overview of the methods proposed by the various LPA FEL research groups. At the BELLA Center at LBNL, we are pursuing the use of a chicane for longitudinal e-beam decompression (therefore greatly reducing the slice energy spread), in combination with short-scale-length e-beam transportation with an active plasma lens and a strong-focusing 4-m-long undulator. We present ELEGANT & GENESIS simulations on the transport and FEL gain, showing strong enhancement in output power over the incoherent background, and present estimates of the 3D gain length for deviations from the expected e-beam properties (varying e-beam lengths and emittances). To highlight the role of collective effects, we also present ELEGANT & GENESIS simulation results.

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“…These effects will lead to a longer gain length . Fitting formulas available in the literature [14] allow one to calculate Λ. The energy-spread contribution to Λ is found [14] to be .…”

Section: Lpa E-beam Manipulation For Free-electron Lasermentioning

confidence: 99%

Section: Lpa E-beam Manipulation For Free-electron Lasermentioning

confidence: 99%

Free-electron lasers driven by laser plasma accelerators

Tilborg

Barber

Isono

et al. 2017

AIP Conference Proceedings

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“…As a measure of transverse coherence, we define the quantity ζ coh ≡ P 1 =P tot , which corresponds to the ratio of the power due to the fundamental mode (for which i ¼ 1) to the total power. Following [12], we assume that P ð0Þ i and P ð0Þ ij are all of the same order of magnitude. This is a significant overestimate of the amount of power associated with the higher-order modes but it allows us to simplify the analysis by expressing ζ coh solely in terms of the gain factor ratios introduced previously.…”

Section: =3mentioning

confidence: 99%

Eigenmode analysis of a high-gain free-electron laser based on a transverse gradient undulator

Baxevanis

Huang

Ruth

et al. 2015

Phys. Rev. ST Accel. Beams

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The use of a transverse gradient undulator (TGU) is viewed as an attractive option for free-electron lasers (FELs) driven by beams with a large energy spread. By suitably dispersing the electron beam and tilting the undulator poles, the energy spread effect can be substantially mitigated. However, adding the dispersion typically leads to electron beams with large aspect ratios. As a result, the presence of higher-order modes in the FEL radiation can become significant. To investigate this effect, we study the eigenmode properties of a TGU-based, high-gain FEL, using both an analytically-solvable model and a variational technique. Our analysis, which includes the fundamental and the higher-order FEL eigenmodes, can provide an estimate of the mode content for the output radiation. This formalism also enables us to study the trade-off between FEL gain and transverse coherence. Numerical results are presented for a representative soft X-ray, TGU FEL example.

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“…[20], where À 3D ¼ À 1D =ð1 þ T Þ and the dimensionless quantity T is a function of scaled electron properties for diffraction, energy spread, and emittance. Here, the effect of emittance is neglected.…”

Section: B Corrections To the Linear Gain Rate From 3d Effectsmentioning

confidence: 99%

“…[22]. The growth rate [20] is then Àð r Þ ¼ ð1 À 2 r = 2 ÞÀ 1D , where r is the relative energy spread at the end of the radiator section and start of the oscillator. The intensity at saturation [19] is I sat ð r Þ ¼ ð1 À 2 r = 2 Þ 2 c f P beam =AE A .…”

Section: B Corrections To the Linear Gain Rate From 3d Effectsmentioning

confidence: 99%

Oscillator seeding of a high gain harmonic generation free electron laser in a radiator-first configuration

Gandhi

Penn

Reinsch

et al. 2013

Phys. Rev. ST Accel. Beams

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A longitudinally and transversely coherent, high repetition rate x-ray source with widely tunable wavelength is desired for a variety of experimental applications. A free electron laser (FEL) powered by an electron beam from a superconducting linac can reach the desired peak and average x-ray power levels with transverse coherence. However, generating longitudinally coherent x-ray pulses is a significant challenge, especially at high repetition rate. This paper presents a one-dimensional theoretical and numerical investigation of a method to achieve longitudinal coherence and high repetition rate simultaneously. We propose a ''radiator-first'' configuration, wherein an FEL oscillator follows a high gain harmonic generation (HGHG) FEL. The oscillator generates seed power that is directed upstream to initiate the HGHG process in a following electron bunch. This configuration allows for the generation of radiation at short wavelength, which is highly sensitive to energy spread, to occur before the longer wavelength oscillator, whose performance is not seriously degraded by the beam heating in the upstream radiator. The dynamics and stability of this radiator-first scheme is explored analytically and numerically. A single-pass, 1D map is derived using a semianalytic model for FEL gain and saturation. Iteration of the map is shown to be in good agreement with simulations. A numerical example is presented for a soft x-ray FEL.

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Corrigendum to ‘Development and conditioning of the high current ion source for the EAST neutral beam injector’ [Nucl. Instrum. Methods Phys. Res. A 727 (2013) 29–32]

Cited by 11 publications

References 0 publications

Free-electron lasers driven by laser plasma accelerators

Free-electron lasers driven by laser plasma accelerators

Eigenmode analysis of a high-gain free-electron laser based on a transverse gradient undulator

Oscillator seeding of a high gain harmonic generation free electron laser in a radiator-first configuration

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