Ultralow longitudinal emittance storage rings

Zhang, Y.; Deng, Xiujie; Pan, Z. L.; Li, Zhizhong; Zhou, Kai; Huang, Wenhui; Li, R. K.; Tang, Chuanxiang; Chao, Alexander W.

doi:10.1103/physrevaccelbeams.24.090701

Cited by 12 publications

(6 citation statements)

References 24 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%

“…To promote SSMB research and in particular develop an EUV SSMB storage ring, a task force has been established at Tsinghua University (Tang et al, 2018;Pan et al, 2019;Deng et al, 2020aDeng et al, ,b, 2021aZhang et al, 2021;Tang & Deng, 2022;Deng, 2022), in collaboration with researchers from other institutes. A key progress of the collaboration is the recent success of the SSMB proof-of-principle experiment conducted at the Metrology Light Source (MLS) in Berlin, Germany (Deng et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

“…A key progress of the collaboration is the recent success of the SSMB proof-of-principle experiment conducted at the Metrology Light Source (MLS) in Berlin, Germany (Deng et al, 2021a). The SSMB beam physics study (Deng et al, 2020a(Deng et al, ,b, 2021bZhang et al, 2021;Deng, 2022) and magnet lattice design (Pan et al, 2019) for the EUV SSMB storage ring are also ongoing, with encouraging progress being achieved. Other active SSMB-related research activities are also ongoing (Jiao et al, 2011;Chao et al, 2016;Khan, 2017;Li et al, 2019;Tsai et al, 2021;Tsai, 2022a,b;Zhao et al, 2021;Lu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Deng¹,

Zhang²,

Pan³

et al. 2023

J Synchrotron Radiat

Self Cite

View full text Add to dashboard Cite

show abstract

“…The evolution of an electron traversing the undulator and circulating in the remaining storage ring can be formulated using the respective transport matrices M Lw and M Cring . The one-turn matrix can be written as [38,39]…”

Section: Pure Optics Single Particle Motionmentioning

confidence: 99%

“…6 shows their dependence on the scaled radiation wake strength Ŵ [Eq. (39)] and the synchrotron oscillation frequency ω s0,tot [Eq. (40)].…”

Section: Dispersion Equation and Instability Growth Ratementioning

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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SSMB Longitudinal Dynamics

Deng

2023

Springer Theses

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In this chapter, we study the single-particle longitudinal dynamics of SSMB. The motivation is to answer the question: how to realize the short bunch length and small longitudinal emittance in an electron storage ring, as required by SSMB? Note that the curvilinear (Frenet-Serret) coordinate system and the state vector $${\textbf {X}}=(x,x',y,'y',z,\delta )^{T}$$ X = ( x , x ′ , y , ′ y ′ , z , δ ) T , with $$^{T}$$ T representing the transpose, are used throughout this dissertation. For the longitudinal dynamics without coupling from the transverse dimension, what we can play are the momentum compaction and RF systems, for SSMB the laser modulators.

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Ultralow longitudinal emittance storage rings

Cited by 12 publications

References 24 publications

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

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

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

SSMB Longitudinal Dynamics

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