Measurement of ultra low transverse emittance at REGAE

Hachmann, Max; Flöttmann, Klaus

doi:10.1016/j.nima.2016.01.065

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…The transverse emittance is determined by scanning the current of a focusing solenoid and measuring the size of the electron beam profile on the MCP [39]. In the case of an uncompressed injection beam, parabolic fits to beam size versus current reveal a transverse emittance in the horizontal and vertical directions of ε x,n 1.703 mm mrad and ε y,n 1.491 mm mrad, respectively [ Fig.…”

Section: Emittancementioning

confidence: 99%

Femtosecond phase control in high-field terahertz-driven ultrafast electron sources

Zhang¹,

Fallahi²,

Hemmer³

et al. 2019

Optica

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Terahertz-based electron acceleration has recently emerged as a promising candidate for driving next-generation highbrightness electron sources. Although initial demonstrations have proven the feasibility of this technology for accelerating and manipulating the phase space of electrons, further demonstrations of exquisite timing control are required to make use of terahertz acceleration for demanding applications such as light sources and ultrafast electron diffraction. In this paper, we use a two-stage segmented-terahertz-electron-accelerator-and-manipulator (STEAM) setup to demonstrate control over the electron beam energy, energy spread, and emittance. The first rebunching stage is used to tune the duration of 55 keV electron bunches from a DC electron gun that enables femtosecond phase control at the second accelerating stage. For optimized parameters, energy spread and emittance are reduced by 4× and 6×, respectively, relative to operation with the first stage off. A record energy gain of ∼70 keV was achieved at a peak accelerating field of 200 MV/m, resulting in a >100% energy boost in a terahertz-powered accelerator for the first time. These results represent a critical step forward for the practical implementation of terahertz-powered devices in ultrafast electron sources.

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Section: Emittancementioning

confidence: 99%

Femtosecond phase control in high-field terahertz-driven ultrafast electron sources

Zhang¹,

Fallahi²,

Hemmer³

et al. 2019

Optica

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“…Relativistic FED was found to be of great importance to XFELs since the generation of high-quality low emittance electron beams are beneficial to both technologies. University-based pioneering MeV FED setups have been developed at UCLA [184,207] and Osaka, [187,247] and later launched at BNL, [192] SLAC [171][172][173][193][194][195][196] and DESY [248,249]. The amount of existing knowhow in accelerator centers has been critical to obtain stable RF-photoinjectors with minimal laser-RF timing noise to reach ≈ 100 fs (rms) temporal resolution [250].…”

Section: Ultrabright Relativistic Fed Setups: Rf-photoinjectorsmentioning

confidence: 99%

Recent Advances in Ultrafast Structural Techniques

Sciaini

2019

Applied Sciences

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A review that summarizes the most recent technological developments in the field of ultrafast structural dynamics with focus on the use of ultrashort X-ray and electron pulses follows. Atomistic views of chemical processes and phase transformations have long been the exclusive domain of computer simulators. The advent of femtosecond (fs) hard X-ray and fs-electron diffraction techniques made it possible to bring such a level of scrutiny to the experimental area. The following review article provides a summary of the main ultrafast techniques that enabled the generation of atomically resolved movies utilizing ultrashort X-ray and electron pulses. Recent advances are discussed with emphasis on synchrotron-based methods, tabletop fs-X-ray plasma sources, ultrabright fs-electron diffractometers, and timing techniques developed to further improve the temporal resolution and fully exploit the use of intense and ultrashort X-ray free electron laser (XFEL) pulses.

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“…Methods for measuring single-shot emittance values for ultra-low charge bunches at the RF gun exit have been developed at UCLA [87]. Low emittances have also been measured, again at the RF gun exit, by using the well-known solenoid scan technique [88]. Nanometer slice emittances of a 30 fC beam, a few ps long, have been measured at SwissFEL Injector Test Facility [89] at about 250 MeV by using conventional emittance reconstruction in a multi-screen lattice combined with high resolution transverse profile monitors.…”

Section: Characterization Of Low Charge Beamsmentioning

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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Measurement of ultra low transverse emittance at REGAE

Cited by 15 publications

References 2 publications

Femtosecond phase control in high-field terahertz-driven ultrafast electron sources

Femtosecond phase control in high-field terahertz-driven ultrafast electron sources

Recent Advances in Ultrafast Structural Techniques

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

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