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

Penco, G.; Allaria, E.; Cudin, Ivan; Mitri, S. Di; Gauthier, David; Spampinati, S.; Trovò, M.; Giannessi, L.; Roussel, Eléonore; Bettoni, S.; Craievich, P.

doi:10.1103/physrevlett.119.184802

Cited by 18 publications

(9 citation statements)

References 30 publications

(35 reference statements)

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“…A dechirper system [56,57] was installed 120 m upstream of the entrance of the undulator line to control the electron bunch time-energy longitudinal distribution. Longitudinal phase space control with a dedicated wakefield device had been also previously demonstrated at other facilities [58][59][60][61][62]. The system is composed by two 2-m long modules, one vertical and one horizontal.…”

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confidence: 99%

High-Power Femtosecond Soft X Rays from Fresh-Slice Multistage Free-Electron Lasers

et al. 2018

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We demonstrate a novel multistage amplification scheme for self-amplified spontaneous-emission free electron lasers for the production of few femtosecond pulses with very high power in the soft x-ray regime. The scheme uses the fresh-slice technique to produce an x-ray pulse on the bunch tail, subsequently amplified in downstream undulator sections by fresh electrons. With three-stages amplification, x-ray pulses with an energy of hundreds of microjoules are produced in few femtoseconds. For single-spike spectra x-ray pulses the pulse power is increased more than an order of magnitude compared to other techniques in the same wavelength range.

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confidence: 99%

High-Power Femtosecond Soft X Rays from Fresh-Slice Multistage Free-Electron Lasers

et al. 2018

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“…The favored solution to resolve the nonlinearity is to use a high frequency passive corrugated structure [47], to correct the second order curvature prior to compression [48,49]. When a high current electron beam goes through a corrugated structure, the resulting wakefield can be used to modify the longitudinal phase distribution of the beam [50].…”

Section: Time-dependent Simulations and Longitudinal Phase Space Matc...mentioning

confidence: 99%

Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam

Park,

Agustsson,

Berg

et al. 2021

Preprint

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In this paper we discuss the design choices and construction strategy of the tapered undulator system designed for a high energy extraction efficiency experiment in the ultraviolet region of the electromagnetic spectrum planned for installation at the Argonne National Laboratory Linac Extension Area (LEA) beamline. The undulator is comprised of 4 sections pure permanent magnet Halbach array separated by short break sections, each one of them housing a focusing quadrupole doublet and a phase shifter. The quadrupoles use a novel hybrid design which allows one to vary the gradient and match the beam transversely. The undulator tapering profile is optimized to maximize the energy conversion efficiency from a 343 MeV 1 kA beam into coherent 257.5 nm radiation taking into account the longitudinal current profile generated by the linac.

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“…Finally at FERMI it has been recently demonstrated that wakefields can also be used to achieve passive linearization of the longitudinal phase space in combination with magnetic bunch compression [48].…”

Section: Non Linearity In the Longitudinal Phase Space Distributionmentioning

confidence: 99%

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

et al. 2018

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Laser driven Wake-Field Acceleration (LWFA) has proven its capability of accelerating electron bunches (e-bunches) to up to 4 GeV energy in a single stage while reaching gradients up to hundreds of GV/m. Because of the short period of the accelerating field (typically ranging from 100 fs to 1 ps duration) and the requirement of extremely small beam size (typically smaller than 1 µm) to match the channel, e-bunches can reach extremely high densities. They can be either extracted directly from the plasma or externally injected. The study of the external injection is interesting for two main reasons. On the one hand this method allows better control of the quality of the input beam and on the other hand it is in general necessary when a staged approach of the accelerator is considered. The interest in producing, characterizing and transporting high brightness ultra-short e-bunches has grown together with the interest in LWFA and other novel high-gradient acceleration techniques. In this paper we will review the principal techniques for producing and shaping ultra-short electron bunches with the example of the SINBAD-ARES (Accelerator Research Experiment at SINBAD) linac at the Deutsches Elektronen-Synchrotron (DESY). Our goal is to show how the design of the SINBAD-ARES linac satisfies the requirements for generating high brightness LWFA probes. In the last part of the paper we shall also comment on the technical challenges for electron control and characterization.

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

Cited by 18 publications

References 30 publications

High-Power Femtosecond Soft X Rays from Fresh-Slice Multistage Free-Electron Lasers

High-Power Femtosecond Soft X Rays from Fresh-Slice Multistage Free-Electron Lasers

Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam

Conceptual and Technical Design Aspects of Accelerators for External Injection in LWFA

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