Proposed UV FEL user facility at BNL

Ben‐Zvi, I.; Mauro, L. F. Di; Krinsky, S.; White, Michael G.; Yu, Lihua

doi:10.1016/0168-9002(91)90845-h

Cited by 66 publications

(26 citation statements)

References 6 publications

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“…The two main approaches that are currently pursued in the design of the next generation light sources are the self-amplified spontaneous emission (SASE) FELs [1,2], and the highgain harmonic generation (HGHG) approach [3,4]. One of the main advantages of the HGHG approach over the SASE FEL is that, by using up-frequency conversion of the initial seed signal, HGHG allows to produce not only transversely, but also temporally coherent pulses.…”

Section: Introductionmentioning

confidence: 99%

Using the Beam-Echo Effect for Generation of Short-Wavelength Radiation

2009

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We propose to use an echo effect previously observed in hadron accelerators for up-frequency conversion of density modulation in an electron beam. We show that, for generation of high harmonics, this method is much more efficient in comparison with the currently used approach.A one dimensional model of the effect is developed which allows to optimize the amplitude of the modulation for a given harmonic number.

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Section: Introductionmentioning

confidence: 99%

Using the Beam-Echo Effect for Generation of Short-Wavelength Radiation

2009

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“…In seeded FELs shot noise competes with external modulations during the amplification process [11,12], and suppressing the SASE startup could extend seeded FELs to x-ray wavelengths. In harmonic seeding schemes such as HGHG or EEHG [13][14][15], even reducing shot noise at the initial seed wavelength would lower the seed laser power requirement. Shot noise suppression may also aid other areas of accelerator physics, for example increasing efficiency in cooling relativistic beams [16,17].…”

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confidence: 99%

Observation of Shot Noise Suppression at Optical Wavelengths in a Relativistic Electron Beam

Ratner

Stupakov

2012

Phys. Rev. Lett.

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Control of collective properties of relativistic particles is increasingly important in modern accelerators. In particular, shot noise affects accelerator performance by driving instabilities or by competing with coherent processes. We present experimental observations of shot noise suppression in a relativistic beam at the Linac Coherent Light Source. By adjusting the dispersive strength of a chicane, we observe a decrease in the optical transition radiation emitted from a downstream foil. We show agreement between the experimental results, theoretical models, and 3D particle simulations.

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“…In contrast, FELs ''seeded'' by optical or UV lasers promise full coherence and shorter FEL lengths. One leading seeded FEL scheme is high gain harmonic generation (HGHG) [4,5]. However, single-stage HGHG requires high laser power (expensive and potentially problematic for the FEL process), and is limited to wavelengths around 20 nm [6].…”

Section: Introductionmentioning

confidence: 99%

Two-chicane compressed harmonic generation of soft x rays

Ratner

Chao

Huang

2011

Phys. Rev. ST Accel. Beams

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Seeding an electron bunch prior to compression simultaneously shifts the laser modulation to shorter wavelengths while decreasing the required modulation amplitude. The final x-ray wavelength is then tunable by controlling the compression factor with the rf phase. In this paper we describe a two-chicane scheme that allows for large modulation amplitudes, extending the method to photocathode beams with significant uncorrelated energy spreads. The downside of such compressed seeding is the need to maintain bunching across an extended accelerator region. We present analytical estimates and computer simulations to study tolerances for a sample lattice. We also note that transportation of the fine compressed modulation structure is helped by error self-correction in the second chicane, an effect that may be of more general interest.

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Proposed UV FEL user facility at BNL

Cited by 66 publications

References 6 publications

Using the Beam-Echo Effect for Generation of Short-Wavelength Radiation

Using the Beam-Echo Effect for Generation of Short-Wavelength Radiation

Observation of Shot Noise Suppression at Optical Wavelengths in a Relativistic Electron Beam

Two-chicane compressed harmonic generation of soft x rays

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