Use of a corrugated beam pipe as a passive deflector for bunch length measurements

Seok, Jimin; Chung, М.; Kang, Heung-Sik; Min, Chang-Ki; Na, Donghyun

doi:10.1103/physrevaccelbeams.21.022801

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…When an electron beam is displaced relative to the center of the corrugated structure and passes near the corrugated wall, it experiences a time-correlated transverse kick in the direction of the wall, thus streaking the beam perpendicular to the wall. This corrugated structure property has been used in FEL scheme, namely fresh-slice technique 11 , and for diagnostic purposes for beam length measurement 12 , 13 and recently for electron beam longitudinal phase space (LPS) measurements 14 .…”

Section: Methodsmentioning

confidence: 99%

First measurement of energy diffusion in an electron beam due to quantum fluctuations in the undulator radiation

Tomin

Schneidmiller

Decking

2023

Sci Rep

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Plasma and beam physics are usually considered as classical physics disciplines with quantum effects featuring only rarely. In particular, free electron lasers (FELs) even in the Angstrom regime (developed recently and being upgraded towards even shorter wavelengths) are well described by classical mechanics and electrodynamics. There is, however, a quantum effect that can influence the operation of these devices and limit the shortest achievable wavelength, namely energy diffusion in an electron beam due to quantum fluctuations in undulator radiation. Although this effect has been calculated theoretically, it has never been measured. In this paper we present measurements of quantum diffusion effect at the European X-Ray Free-Electron Laser. The method uses a recently installed wakefield structure, which enables measurements of the longitudinal phase space after the hard X-ray undulator. The effect of quantum diffusion in the undulator is measured for the first time, and the results are in good agreement with theoretical predictions.

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Section: Methodsmentioning

confidence: 99%

First measurement of energy diffusion in an electron beam due to quantum fluctuations in the undulator radiation

Tomin

Schneidmiller

Decking

2023

Sci Rep

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“…Thus, it generates time and transverse correlation just like RF deflecting cavities. While this passive device may provide a big advantage on timing jitter, the nonlinearity of the transverse wake will require more extensive analysis to design the mask and eliminate the correlation after chopping (Bettoni et al, 2016;Craievich and Lutman, 2017;Seok et al, 2018).…”

Section: Single-bunch Profile Shapingmentioning

confidence: 99%

Bunch Shaping in Electron Linear Accelerators

Ha,

Kim,

Piot

et al. 2021

Preprint

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Modern electron linear accelerators are often designed to produce smooth bunch distributions characterized by their macroscopic ensemble-average moments. However, an increasing number of accelerator applications call for finer control over the beam distribution, e.g., by requiring specific shapes for its projection along one coordinate. Ultimately, the control of the beam distribution at the single-particle level could enable new opportunities in accelerator science. This review discusses the recent progress toward controlling electron beam distributions on the "mesoscopic" scale with an emphasis on shaping the beam or introducing complex correlations required for some applications. This review emphasizes experimental and theoretical developments of electron-bunch shaping methods based on bounded external electromagnetic fields or via interactions with the self-generated velocity and radiation fields. 1. Space-charge field with a single bunch 41 2. Space-charge field with a few bunches 43 3. Space-charge field with multiple bunches: space-charge oscillation 44 4. Space-charge field with multiple bunches: longitudinal cascade amplifier 46 5. Space-charge field with multiple bunches: plasma cascade amplifier 47 B. Shaping profiles using coherent synchrotron radiation 47 C. Shaping profiles using wakefields 49 1. Bunch compression 50 2. Bunch train generation 50 3. Single-bunch profile shaping 51 4. Control over the energy distribution 52 5. Control over longitudinal phase space 53 VI. Coupling between degrees of freedom for phase-space tailoring 54 A. Introduction 54 B. Coupling between the two transverse degrees of freedom 54 1. Producing beams with canonical angular momentum 54 2. Decoupling of CAM-dominated beams and transverse emittance partitioning 55 3. Phase-space exchange between the two transverse planes 57 C. Transverse-to-longitudinal phase-space exchangers 59 1. Emittance exchange 59 2. Current profile shaping 60 3. Bunch compression 62 4. Double phase-space exchangers 62 D. Generalized phase-space repartitioning between the three degrees of freedom 65 1. Flat beam transformation combined with emittance exchange 65 2. Coupling between the longitudinal and transverse phase spaces 65

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“…1. For a uniformly distributed electron bunch passing through a horizontal corrugated structure far from the axis, assuming a driving electron at (x 0 , y 0 ) and a trailing electron at (x, y), with |x À x 0 | small compared with the gap size, the short-range transverse point wakes can be approximately given by Seok et al, 2018)…”

Section: Generation Of a Large Tilted Bunchmentioning

confidence: 99%

Generating three-color pulses in high-gain harmonic-generation free-electron lasers with a tilted electron bunch

Zhao

et al. 2019

J Synchrotron Radiat

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A multi-color light source is a significant tool for nonlinear optics experiments, pump–dump/repump–probe experiments and in other fields. Here, a novel method is proposed to create three-color pulses based on a high-gain harmonic-generation (HGHG) free-electron laser with a tilted electron bunch. In this method, the initial bunch tilt is created by transverse wakefields after the bunch passes through a corrugated structure with an off-axis orbit, and is further enlarged in a following drift section. Then the tilted bunch experiences the off-axis field of a quadrupole magnet to cool down the large transverse velocity induced before. After that, it enters an HGHG configuration adopting a transverse gradient undulator (TGU) as the radiator, where only three separated fractions of the tilted bunch will resonate at three adjacent harmonics of the seed wavelength and are enabled to emit three-color pulses simultaneously. In addition, the use of the natural transverse gradient of a normal planar undulator instead of the TGU radiator to emit three-color pulses is also studied in detail. Numerical simulations including the generation of the tilted bunch and the free-electron laser radiation confirm the validity and feasibility of this scheme both for the TGU radiator and the natural gradient in the extreme-ultraviolet waveband.

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Use of a corrugated beam pipe as a passive deflector for bunch length measurements

Cited by 11 publications

References 18 publications

First measurement of energy diffusion in an electron beam due to quantum fluctuations in the undulator radiation

First measurement of energy diffusion in an electron beam due to quantum fluctuations in the undulator radiation

Bunch Shaping in Electron Linear Accelerators

Generating three-color pulses in high-gain harmonic-generation free-electron lasers with a tilted electron bunch

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