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

Stupakov, Gennady

doi:10.1103/physrevlett.102.074801

Cited by 381 publications

(337 citation statements)

References 13 publications

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“…We then expect to find two harmonics, as evident in a single pass simulation ( Fig.7.6). Had we used the optimal single pass bunching condition (which slightly over-bunches the modulation, see [29]), we would find enhancement of only one of the two harmonics.…”

Section: Echo Steady State Echo Conditionmentioning

confidence: 99%

“…As a third example of a modulation method, we consider the EEHG modulation [29]. EEHG provided the initial motivation for SSMB, so we may be curious if we can implement EEHG directly as a steady state scheme.…”

Section: Echo Steady State Echo Conditionmentioning

confidence: 99%

“…We note that single-shot versions of MB (λ in =λ out ) are mainstays of FEL seeding (see e.g. [9,29]). Portions of this chapter were published as [82].…”

Section: Introductionmentioning

confidence: 99%

“…Multiple-stage HGHG can reach shorter wavelengths, but is more technically challenging. A recent and promising seeding scheme is echo enabled harmonic generation (EEHG), which manipulates hidden structure in phase space to produce high harmonic seeding [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Ratner

2011

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Section: Echo Steady State Echo Conditionmentioning

confidence: 99%

Section: Echo Steady State Echo Conditionmentioning

confidence: 99%

“…We note that single-shot versions of MB (λ in =λ out ) are mainstays of FEL seeding (see e.g. [9,29]). Portions of this chapter were published as [82].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Ratner

2011

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“…Another mechanism was proposed in 2009 by Gennady Stupakov at SLAC [14]: the Echo Enabled Harmonic Generation (EEHG) concept. Here, like the cascaded HGHG technique, the beam is modulated two times in energy and compressed by a chicane.…”

Section: Seeding Techniques For Felsmentioning

confidence: 99%

A Proof-of-Principle Echo-enabled Harmonic Generation Free Electron Laser Experiment at SLAC

Pernet

2010

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With the advent of X-ray Free Electron Lasers (FELs), new methods have been developed to extend capabilities at short wavelengths beyond Self-Amplified Spontaneous Emission (SASE). In particular, seeding of a FEL allows for temporal control of the radiation pulse and increases the peak brightness by orders of magnitude. Most recently, Gennady Stupakov and colleagues at SLAC proposed a new technique: Echo-Enabled Harmonic Generation (EEHG). Here a laser microbunches the beam in an undulator and the beam is sheared in a chicane. This process is repeated with a second laser, undulator and chicane. The interplay between these allows a seeding of the X-ray laser up to the 100th harmonic of the first laser. After introducing the physics of FELs and the EEHG seeding technique, we describe contributions to the experimental effort. We will present detailed studies of the experiment including the choice of parameters and their optimization, the emittance effect, spontaneous emission in the undulators, the second laser phase effect, and measurements of the jitter between RF stations. Finally, the status and preliminary results of the Echo-7 experiment will be outlined.

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Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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A theoretical analysis of the radiation in X-ray free electron lasers (FELs) LCLS, PAL-XFEL, SwissFEL, as well as SACLA, FLASH 2, and European XFEL is presented. Major losses in FELs are analytically accounted for and analyzed, using exact expressions for the Bessel factors in terms of the generalized Bessel functions. This allows distinguishing the contributions of key parameters and accounting for the losses individually for each harmonic, considering higher sensitivity of the electron-photon interaction at higher harmonic wavelengths. The harmonic power evolution along FELs and the spectral width of the radiation lines is studied. The theoretical results are analyzed and are compared with the available experimental data for the FEL experiments. The harmonic generation and amplification in the FELs are modeled and studied with the harmonic lasing self-seed (HLSS) with separate buncher and radiator, and the results are compared with those for SASE. The spectral properties of the radiation are analytically calculated and compared with the measured spectral characteristics. The advantages of HLSS versus SASE FEL are elucidated in the examples of FLASH2, European XFEL, and SwissFEL. The prospected radiation properties of LCLS-II FEL are analyzed and the possibilities of using harmonics in this FEL are proposed.

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

Cited by 381 publications

References 13 publications

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

Much Ado about Microbunching: Coherent Bunching in High Brightness Electron Beams

A Proof-of-Principle Echo-enabled Harmonic Generation Free Electron Laser Experiment at SLAC

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

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