Single-particle dynamics of microbunching

Deng, Xiujie; Chao, Alexander W.; Feikes, J.; Huang, Wenhui; Ries, Markus; Tang, Chuanxiang

doi:10.1103/physrevaccelbeams.23.044002

Cited by 23 publications

(9 citation statements)

References 40 publications

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“…We recognize that realizing a steady-state bunch length as short as the nanometre level in an electron storage ring is non-trivial. Both global and local momentum compaction should be minimized to confine the longitudinal beta function, and therefore the longitudinal emittance, in an electron storage ring (Deng et al, 2020a(Deng et al, , 2021cZhang et al, 2021). By invoking this principle in the lattice design, a bunch length as short as tens of nanometres can be realized in a storage ring (Pan, 2020), with a momentum compaction factor of 1 Â 10 À6 and modulation laser power of 1 MW.…”

Section: Discussionmentioning

confidence: 99%

Average and statistical properties of coherent radiation from steady-state microbunching

Deng¹,

Zhang²,

Pan³

et al. 2023

J Synchrotron Radiat

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A promising accelerator light source mechanism called steady-state microbunching (SSMB) is being actively studied. With the combination of strong coherent radiation from microbunching and high repetition rate of a storage ring, high-average-power narrow-band radiation can be anticipated from an SSMB storage ring, with wavelengths ranging from THz to soft X-ray. Such a novel light source could provide new opportunities for accelerator photon science like high-resolution angle-resolved photoemission spectroscopy and industrial applications like extreme ultraviolet (EUV) lithography. In this paper, a theoretical and numerical study of the average and statistical properties of coherent radiation from SSMB are presented. The results show that 1 kW average-power quasi-continuous-wave EUV radiation can be obtained from an SSMB ring provided that an average current of 1 A and a microbunch train with bunch length of 3 nm can be formed at the radiator which is assumed to be an undulator. Together with the narrow-band feature, the EUV photon flux can reach 6 × 1015 photons s−1 within a 0.1 meV energy bandwidth, which is three orders of magnitude higher than that in a conventional synchrotron source and is appealing for fundamental condensed matter physics and other research. In this theoretical investigation, we have generalized the definition and derivation of the transverse form factor of an electron beam which can quantify the impact of its transverse size on coherent radiation. In particular, it has been shown that the narrow-band feature of SSMB radiation is strongly correlated with the finite transverse electron beam size. Considering the pointlike nature of electrons and quantum nature of radiation, the coherent radiation fluctuates from microbunch to microbunch, or for a single microbunch from turn to turn. Some important results concerning the statistical properties of SSMB radiation are presented, with a brief discussion on its potential applications, for example the beam diagnostics. The presented work is of value for the development of SSMB to better serve potential synchrotron radiation users. In addition, this also sheds light on understanding the radiation characteristics of free-electron lasers, coherent harmonic generation, etc.

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Section: Discussionmentioning

confidence: 99%

Average and statistical properties of coherent radiation from steady-state microbunching

Deng¹,

Zhang²,

Pan³

et al. 2023

J Synchrotron Radiat

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“…In addition, the steady-state micro-bunching (SSMB) mechanism has been proposed to utilize micro-bunching in electron SRs. 158 , 159 , 160 The idea of SSMB is to manipulate the particle dynamics in a dedicated lattice, usually using laser modulators as the bunching systems. This induces micro-bunching, which is sustained in a turn-by-turn steady state each time the beam passes through the radiator.…”

Section: Current Developments and Future Prospects For Xfelsmentioning

confidence: 99%

“…Active research concerning SSMB-related physics and technology is ongoing. 159 , 160 Recently, the SSMB mechanism was demonstrated experimentally for the first time by the Tsinghua University collaboration at the Metrology Light Source. 160 …”

Section: Current Developments and Future Prospects For Xfelsmentioning

confidence: 99%

Features and futures of X-ray free-electron lasers

et al. 2021

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X-ray free-electron lasers (XFELs) generate X-ray by electrons flying through a periodic magnetic field.-XFELs are the leading X-ray sources with ultra-high brightness and ultra-short duration.-XFELs can be launched from either the shot noise of the electron beam or the seed.-XFEL-laser collision is proposed to learn the nature of vacuum at SHINE.-XFELs are being combined with intense lasers and synchrotron radiation light sources.

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“…The peak power from storage ring light sources is much lower than that from the linac-based FEL. Recently a mechanism of the steady-state microbunching (SSMB) in a storage ring has been proposed and investigated [2][3][4][5][6][7][8]. The SSMB aims to maintain the same excellent high repetition rate, close to continuous-wave operation, as the storage ring.…”

Section: Introductionmentioning

confidence: 99%

“…The theoretical formulation of microbunching instability has been developed, for example, in single-pass linac-based FEL facilities [11][12][13][14][15][16][17][18], the RF-based storage ring light sources [19][20][21][22][23] and the ERL-based light sources or recirculating electron cooling facilities [24][25][26][27][28]. As for the SSMB-based storage ring light sources, the single-particle dynamics has been recently investigated in detail [6,29] and the proof-of-principle experiment has been conducted to demonstrate that the microbunching is achievable after one complete revolution of an electron bunch modulated by an external laser in a dedicated storage ring [7]. However the collective effects in the SSMB storage ring were not examined in detail.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal single-bunch instabilities driven by coherent undulator radiation in the cavity modulator of a steady-state microbunching storage ring

Tsai

2022

Preprint

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Recently a mechanism of storage ring operation based on the steady-state microbunching has been proposed and investigated, which contains a laser cavity modulator providing the longitudinal focusing for the circulating microbunches. In this paper we analyze the impact of the coherent undulator radiation on the longitudinal single-bunch multi-turn collective dynamics, exploring a new possible instability mechanism. We formulate the multi-turn equations of motion for the single microbunch as two sets of difference equations in the modulator and in the remaining storage ring. The dispersion equation can then be obtained by introduction of the undulator-averaged phase space coordinates. The predicted instability growth rate shows reasonable agreement with the numerical turn-by-turn tracking simulations provided validity of the underlying assumptions. The analysis shall provide some insights for the coherent undulator radiation driven multi-turn instability in the cavity modulator. Differences between such a new instability mechanism and the Robinson instability in a conventional radio-frequency-based storage ring are also discussed.

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Single-particle dynamics of microbunching

Cited by 23 publications

References 40 publications

Average and statistical properties of coherent radiation from steady-state microbunching

Average and statistical properties of coherent radiation from steady-state microbunching

Features and futures of X-ray free-electron lasers

Longitudinal single-bunch instabilities driven by coherent undulator radiation in the cavity modulator of a steady-state microbunching storage ring

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