Demonstration of Nonlinear-Energy-Spread Compensation in Relativistic Electron Bunches with Corrugated Structures

Fu, Feichao; Wang, Rui; Zhu, Ping; Zhao, Lingrong; Jiang, Tao; Lu, Cewu; Liu, Shengguang; Shi, Liu; Liu, Yan; Deng, Haixiao; Feng, Chao; Gu, Qiang; Huang, Dazhang; Liu, Bo; Wang, Dong; Wang, Xingtao; Zhang, Meng; Zhao, Zhentang; Stupakov, Gennady; Xiang, Dao; Zhang, Jie

doi:10.1103/physrevlett.114.114801

Cited by 53 publications

(31 citation statements)

References 27 publications

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“…A similar structure can be efficiently utilized for other applications, e.g., for time-dependent beam diagnostics or to remove unwanted time-dependent energy variations in longitudinally compressed electron bunches using longer wavelengths [21][22][23][24][25].…”

Section: Discussionmentioning

confidence: 99%

Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun

Smirnov

Agustsson

Berg

et al. 2015

Phys. Rev. ST Accel. Beams

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We report observations of an intense sub-THz radiation extracted from a ∼3 MeV electron beam with a flat transverse profile propagating between two parallel oversized copper gratings with side openings. Low-loss radiation outcoupling is accomplished using a horn antenna and a miniature permanent magnet separating sub-THz and electron beams. A tabletop experiment utilizes a radio frequency thermionic electron gun delivering a thousand momentum-chirped microbunches per macropulse and an alpha-magnet with a movable beam scraper producing sub-mm microbunches. The radiated energy of tens of microJoules per radio frequency macropulse is demonstrated. The frequency of the radiation peak was generated and tuned across two frequency ranges: (476-584) GHz with 7% instantaneous spectrum bandwidth, and (311-334) GHz with 38% instantaneous bandwidth. This prototype setup features a robust compact source of variable frequency, narrow bandwidth sub-THz pulses.

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Section: Discussionmentioning

confidence: 99%

Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun

Smirnov

Agustsson

Berg

et al. 2015

Phys. Rev. ST Accel. Beams

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“…It should also be noted that through tuning the energy chirp of the electron beam through linac phase and tunable wakefield effects [110,111] before the IFEL modulator, that one may obtain a single attosecond pulse of x-rays from the UC-XFEL. A variant of this approach also utilizing beam self-fields for micro-bunching was shown in the XLEAP experiments at the LCLS recently [106].…”

Section: Physics Applicationsmentioning

confidence: 99%

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Rosenzweig

2019

Advances in Laboratory-Based X-Ray Sources, Optics, and Applications VII

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In the field of beam physics, two frontier topics have taken center stage due to their potential to enable new approaches to discovery in a wide swath of science. These areas are: advanced, high gradient acceleration techniques, and xray free electron lasers (XFELs). Further, there is intense interest in the marriage of these two fields, with the goal of producing a very compact XFEL. In this context, recent advances in high gradient radio-frequency cryogenic copper structure research have opened the door to the use of surface electric fields between 250 and 500 MV/m. Such an approach is foreseen to enable a new generation of photoinjectors with sixdimensional beam brightness beyond the current state-of-the-art by well over an order of magnitude. This advance is an essential ingredient enabling an ultra-compact XFEL (UC-XFEL). In addition, one may accelerate these bright beams to GeV scale in less arXiv:2003.06083v1 [physics.acc-ph]An Ultra-Compact X-Ray Free-Electron Laser 2 than 10 meters. Such an injector, when combined with inverse free electron laserbased bunching techniques can produce multi-kA beams with unprecedented beam quality, quantified by 50 nm-rad normalized emittances. These beams, when injected into innovative, short-period (1-10 mm) undulators uniquely enable UC-XFELs having footprints consistent with university-scale laboratories. We describe the architecture and predicted performance of this novel light source, which promises photon production per pulse of a few percent of existing XFEL sources. We review implementation issues including collective beam effects, compact x-ray optics systems, and other relevant technical challenges. To illustrate the potential of such a light source to fundamentally change the current paradigm of XFELs with their limited access, we examine possible applications in biology, chemistry, materials, atomic physics, industry, and medicine which may profit from this new model of performing XFEL science.

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“…On the other hand, in the real FEL case, because only a small fraction of the beam ( 20% < of the total length for SXFEL) is needed for lasing, one can even obtain the beam of the required small energy spread through the regular way, i.e. implementing a high-harmonic RF cavity or a corrugated structure [28] and then cut out a small fraction of the 'long' beam to meet the condition. Therefore, in this paper it is valid to make the flat longitudinal beam phase space assumption for the proof of principle.…”

Section: Simulation Studiesmentioning

confidence: 99%

Suppression of microbunching instability via a transverse gradient undulator

et al. 2015

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The microbunching instability in the linear accelerator (linac) of a free-electron laser facility has always been a problem that degrades the electron beam quality. In this paper, a quite simple and inexpensive technique is proposed to smooth the electron beam current profile to suppress the instability. By directly adding a short undulator with a transverse gradient field right after the injector to couple the transverse spread into the longitudinal direction, additional density mixing in the electron beam is introduced to smooth the current profile, which results in the reduction of the gain of the microbunching instability. The magnitude of the density mixing can be easily controlled by varying the strength of the undulator magnetic field. Theoretical analysis and numerical simulations demonstrate the capability of the proposed technique in the accelerator of an x-ray freeelectron laser.

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Demonstration of Nonlinear-Energy-Spread Compensation in Relativistic Electron Bunches with Corrugated Structures

Cited by 53 publications

References 27 publications

Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun

Observation of a variable sub-THz radiation driven by a low energy electron beam from a thermionic rf electron gun

Towards an ultra-compact x-ray free-electron laser (Conference Presentation)

Suppression of microbunching instability via a transverse gradient undulator

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