Coulomb-Driven Relativistic Electron Beam Compression

Lu, Cewu; Jiang, Tao; Liu, Shengguang; Wang, Rui; Zhao, Lingrong; Zhu, Ping; Xiang, Dao; Zhang, Jie

doi:10.1103/physrevlett.120.044801

Cited by 13 publications

(3 citation statements)

References 34 publications

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“…In (Lu et al, 2018), this concept was used to compress an electron bunch. During the experiment, they generated a low-charge main bunch and two extra bunches for space-charge field shaping.…”

Section: Space-charge Field With a Few Bunchesmentioning

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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Section: Space-charge Field With a Few Bunchesmentioning

confidence: 99%

Bunch Shaping in Electron Linear Accelerators

Ha,

Kim,

Piot

et al. 2021

Preprint

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“…Along with the evolution of ultra-short pulse laser techniques, the implements of radio-frequency compression, [36][37][38] mega-eV electron source, [39][40][41] terahertz radiation compression, [42,43] and highly compact instrument design [44][45][46][47] make UED leap in temporal resolution from hundreds of ps to nowadays tens of fs. [48] On the other hand, efforts have been made to extend the capabilities of UED, i.e., to apply UED in more fields. For example, UED working in reflection geometry [49] was applied in tracking transient structure of germanium surface [50] and phospholipids, [51] and thermal transport across a heterostructure interface; [52] convergent-beam UED was employed to map out lattice deformations in silicon wedge [53,54] and graphite sheet; [55,56] pulsed electron sources working with medium kinetic energy of 1 keV-10 keV [45] and low kinetic energy of hundreds of electron volts [33,34,46,47] were designed to specify UED in studies of thin film, monolayer, surface, and interface.…”

Section: Introductionmentioning

confidence: 99%

Design of an ultrafast electron diffractometer with multiple operation modes*

Hu¹,

Wang²,

Shi³

et al. 2021

Chinese Phys. B

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Directly resolving structural changes in material on the atomic scales of time and space is desired in studies of many disciplines. Ultrafast electron diffraction (UED), which combines the temporal resolution of femtosecond-pulse laser and the spatial sensitivity of electron diffraction, is an advancing methodology serving such a goal. Here we present the design of a UED apparatus with multiple operation modes for observation of collective atomic motions in solid material of various morphologies. This multi-mode UED employs a pulsed electron beam with propagation trajectory of parallel and convergent incidences, and diffraction configurations of transmission and reflection, as well utilities of preparation and characterization of cleaned surface and adsorbates. We recorded the process of electron–phonon coupling in single crystal molybdenum ditelluride following excitation of femtosecond laser pulses, and diffraction patterns of polycrystalline graphite thin film under different settings of electron optics, to demonstrate the temporal characteristics and tunable probe spot of the built UED apparatus, respectively.

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“…Because longitudinal space charge force depends on both the transverse position and longitudinal position of the electrons (see, e.g. [28][29][30]), the energy chirp has both spread and nonlinearity which limit the shortest bunch that can be obtained. In this experiment a collimator before the DBA is used to reduce the spread of the energy chirp by removing the electrons with large transverse offsets.…”

mentioning

confidence: 99%

Achieving 50 femtosecond resolution in MeV ultrafast electron diffraction with a double bend achromat compressor

Qi,

Ma,

Zhao

et al. 2020

Preprint

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Coulomb-Driven Relativistic Electron Beam Compression

Cited by 13 publications

References 34 publications

Bunch Shaping in Electron Linear Accelerators

Bunch Shaping in Electron Linear Accelerators

Design of an ultrafast electron diffractometer with multiple operation modes*

Achieving 50 femtosecond resolution in MeV ultrafast electron diffraction with a double bend achromat compressor

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