Longitudinal phase space synthesis with tailored 3D-printable dielectric-lined waveguides

  title={Longitudinal phase space synthesis with tailored 3D-printable dielectric-lined waveguides},
  author={Frank Mayet and Ralph Assmann and François L{\'e}mery},
  journal={Physical Review Accelerators and Beams},
Longitudinal phase space manipulation is a critical and necessary component for advanced acceleration concepts, radiation sources and improving performances of X-ray free electron lasers. Here we present a simple and versatile method to semi-arbitrarily shape the longitudinal phase space of a charged bunch by using wakefields generated in tailored dielectric-lined waveguides. We apply the concept in simulation and provide examples for radiation generation and bunch compression. We finally… 

Machine learning-based direct solver for one-to-many problems of temporal shaping of electron bunches

Here it is demonstrated how to construct a direct and real-time solver with the aid of a semi-supervised machine learning method, the conditional generative adversarial network (CGAN), to solve one-to-many problems of temporal shaping.

Wakefield assisted bunch compression in storage rings

Equilibrium bunch lengths typical to modern day light sources of tens of picoseconds limit the spectral reach of superradiant approaches for exploring materials and biological samples. In particular,

Drive beam sources and longitudinal shaping techniques for beam driven accelerators

Linear colliders are an attractive platform to explore high-precision physics of newly discovered particles. The recent significant progress in advanced accelerator technologies has motivated their

Energy Compression and Stabilization of Laser-Plasma Accelerators.

Laser-plasma accelerators outperform current radio frequency technology in acceleration strength by orders of magnitude. Yet, enabling them to deliver competitive beam quality for demanding

Machine learning-based direct solver for one-to-many problems on temporal shaping of relativistic electron beams

It is demonstrated that the CGAN solver can learn the one-to-many dynamics and is able to accurately and quickly predict the required dispersion terms for different custom temporal profiles.

Machine Learning-Based Direct Solver for One-To-Many Problems on Temporal Shaping of Electron Beams

It is demonstrated that the CGAN solver can learn the one-to-many dynamics and is able to accurately and quickly predict the required dispersion terms for different custom temporal profiles, and overcomes the limitation of the stochastic optimization methods.

Self-calibration technique for characterization of integrated THz waveguides

Emerging high-frequency accelerator technology in the terahertz regime is promising for the development of compact high-brightness accelerators and high resolution-power beam diagnostics. One



Cascaded modulator-chicane modules for optical manipulation of relativistic electron beams

A sequential arrangement of three pairs of modulators and dispersive sections that performs precise manipulation of a relativistic electron beam’s longitudinal phase space is described. We show that

Demonstration of Cascaded Modulator-Chicane Microbunching of a Relativistic Electron Beam.

T trapping of nearly all (96%) of the electrons in a strongly tapered inverse free-electron laser accelerator, with an order-of-magnitude reduction in injection losses compared to the classical single-buncher scheme, represents a critical advance in laser-based longitudinal phase space manipulations.

Passive Linearization of the Magnetic Bunch Compression Using Self-Induced Fields.

This Letter demonstrates that the longitudinal self-induced field excited by the electron beam itself is able to linearize the compression process without any use of high harmonic rf structure.

Ballistic bunching of photoinjected electron bunches with dielectric-lined waveguides

We describe a simple technique to passively bunch non-ultrarelativistics ($\lesssim 10$~MeV) electron bunches produced in conventional photoinjectors. The scheme employs a dielectric-lined waveguide

Generation of Ramped Current Profiles in Relativistic Electron Beams Using Wakefields in Dielectric Structures.

A novel phase space manipulation method is demonstrated that employs a beam wakefield interaction in a dielectric structure, followed by bunch compression in a permanent magnet chicane, to longitudinally tailor the pulse shape of an electron beam.

Passive Ballistic Microbunching of Nonultrarelativistic Electron Bunches Using Electromagnetic Wakefields in Dielectric-Lined Waveguides.

This Letter proposes and experimentally demonstrate a passive microbunching technique capable of forming a picosecond bunch train at ∼6  MeV and relies on the excitation of electromagnetic wakefields as the beam propagates through a dielectric-lined waveguide.

Generation of Relativistic Electron Bunches with Arbitrary Current Distribution via Transverse-to-Longitudinal Phase Space Exchange

We propose a general method for tailoring the current distribution of relativistic electron bunches. The technique relies on a recently proposed method to exchange the longitudinal phase space

Photocathode laser based bunch shaping for high transformer ratio plasma wakefield acceleration

  • G. LoischJ. Good I. Will
  • Physics
    Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
  • 2018

Few-femtosecond electron beam with terahertz-frequency wakefield-driven compression

We propose and demonstrate a novel method to produce few-femtosecond electron beam with relatively low timing jitter. In this method a relativistic electron beam is compressed from about 150 fs (rms)


  • Rev. ST Accel. Beams 9, 044204
  • 2006