Transverse Beam Emittance Measurement by Undulator Radiation Power Noise

Lobach, Ihar; Nagaitsev, Sergei; Lebedev, Valeri; Romanov, A. V.; Stancari, G.; Valishev, Alexander; Halavanau, Aliaksei; Huang, Zhirong; Kim, Kwang‐Je

doi:10.1103/physrevlett.126.134802

Cited by 12 publications

(8 citation statements)

References 23 publications

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“…Rich information about the electron beam is embedded in the radiation fluctuations, or more generally the statistical properties of the radiation. For example, the turn-by-turn fluctuation of the incoherent undulator radiation can be used to measure the transverse emittance of the electron beam (Lobach et al, 2021b). The previous treatment, however, has usually been for cases where the bunch length is much longer than the radiation wavelength, i.e.…”

Section: Statistical Properties Of Radiationmentioning

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: Statistical Properties Of Radiationmentioning

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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“…If n is large, the average of the squared magnetic flux density from n random configurations λ of Ω is a good approximation to estimate the magnetic noise power. The variance of a stochastic signal is also used in other disciplines as a parameter to characterize the system [45], [46] or to track This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. For more information, see https://creativecommons.org/licenses/by-nc-nd/4.0/ This article has been accepted for publication in a future issue of this journal, but has not been fully edited.…”

Section: Noise Power Calculationmentioning

confidence: 99%

Noise Power Properties of Magnetic Nanoparticles as Measured in Thermal Noise Magnetometry

et al. 2021

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Magnetic nanoparticles have proven to be extremely useful in a broad range of biomedical applications. To ensure optimal efficiency, a precise characterization of these particles is required. Thermal Noise Magnetrometry (TNM) is a recently developed characterization technique that has already been validated against other techniques. TNM offers a unique advantage in that no external excitation of the system is required to drive the measurement. However, the extremely small stochastic signal in the fT range currently limits the accessibility of the method, and a better understanding of the influences of the sample characteristics on the TNM signal is necessary. In this study, we present a theoretical framework to model the magnetic noise power properties of particle ensembles and their signal as measured via TNM. Both intrinsic sample properties (such as the number of particles or their volume) and the geometrical properties of the sample in the setup have been investigated numerically and validated with experiments. It is shown that the noise power depends linearly on the particle concentration, quadratically on the individual particle size, and linearly on the particle size for a constant total amount of magnetic material in the sample. Furthermore, an optimized sample shape is calculated for the given experimental geometry and subsequently 3d printed, giving rise to an 3.5 fold increase in TNM signal from approximately 0.007 to 0.026 pT 2 with less than half of the magnetic material.

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“…In this paper, we focus on the photostatistics of undulator radiation and on synchrotron motion of single electrons. In our previous experiments with many electrons per bunch [13][14][15], we showed that turn-to-turn fluctuations var(N ) of the number N of detected undulator radiation photons per turn have two contributions: (1) a Poissonian contribution equal to N , due to the discrete quantum nature of light, and (2) a collective contribution ∝ N 2 , related to the interference between the fields generated by the electrons in the bunch. In the experiments described here, we eliminated the collective contribution by considering a single circulating electron, in order to thoroughly study quantum fluctuations and to directly test whether they follow the Poissonian photostatistics var(N ) = N predicted by quantum optics in this regime [16][17][18][19].…”

Section: Introductionmentioning

confidence: 98%

Single electron in a storage ring: a probe into the fundamental properties of synchrotron radiation and a powerful diagnostic tool

Lobach¹,

Nagaitsev²,

Romanov³

et al. 2022

J. Inst.

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An experimental study of undulator radiation generated by a single electron was carried out at the Integrable Optics Test Accelerator (IOTA) storage ring at Fermilab. Photons were detected with a single-photon avalanche diode (SPAD) at an average rate of 20 kHz, corresponding to one detection every few hundred revolutions. Events were continuously recorded by a picosecond event timer for as long as 5 minutes at a time. The collected data were used to directly test the predictions of classical Poisson photostatistics. The study was motivated in part by a previous observation of sub-Poissonian statistics in a similar experiment with synchrotron radiation. In addition, we show that the time series of recorded events can be used to study the synchrotron motion of a single electron, yielding dynamical parameters such as the phase jitter of the radiofrequency cavity and the dependence of the synchrotron period on amplitude. Research plans for further experiments are also discussed.

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Transverse Beam Emittance Measurement by Undulator Radiation Power Noise

Cited by 12 publications

References 23 publications

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

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

Noise Power Properties of Magnetic Nanoparticles as Measured in Thermal Noise Magnetometry

Single electron in a storage ring: a probe into the fundamental properties of synchrotron radiation and a powerful diagnostic tool

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