Observing microscopic structures of a relativistic object using a time-stretch strategy

Roussel, Eléonore; Évain, C.; Parquier, Marc Le; Szwaj, C.; Bielawski, S.; Manceron, L.; Brubach, Jean‐Blaise; Tordeux, Marie-Agnès; Ricaud, J.P.; Cassinari, L.; Labat, M.; Couprie, Marie-Emmanuelle; Roy, Pascale Le

doi:10.1038/srep10330

Cited by 47 publications

(40 citation statements)

References 29 publications

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“…15 The EOSD has already been used on storage rings, 6, 7 as well as on Free Electron Lasers (FELs). 5,19 However, to date used methods do not fulfill the requirements for single-shot detection at high-repetition rate, i.e.…”

Section: Application To the Spectrally Encoded Electro-optic Detectionmentioning

confidence: 99%

“…di interesse nazionale, Strada Statale 14 -km 163,5 in AREA Science Park, 34149 Basovizza, Trieste, Italy † serge.bielawski@univ-lille1.fr time successive pulses of coherent THz radiation emitted by the CSR process, including carrier and envelope. 15 Here we present in detail the characteristics of the detection system, including its possibilities (in terms of repetition rate and sensitivity), as well as its limitations (in particular in term of resolution).…”

Section: Introductionmentioning

confidence: 99%

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A single-shot, high-repetition rate scheme for electro-optic detection of short pulses

Roussel

Évain

Parquier³

et al. 2015

SPIE Proceedings

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We consider the problem of shot-by-shot acquisition of pulse shapes at high repetition rate in accelerator-based systems. More specifically, we examine the two-step strategy consisting in (i) encoding the pulse information onto a laser pulse, and (ii) use the so-called time-stretch strategy to "slow-down" the information before recording. We thus show that the repetition rate of already existing electro-optic sampling setups can be straightforwardly increased up to the 100 ×10 6 pulses/s range, and make a demonstration for the detection of coherent THz pulses. The strategy is however not limited to electro-optic sampling of THz pulses or electron bunches. It can be applied to other types of wavelengths, provided the desired information (as e.g., FEL pulses or electron bunches shapes) can be imprinted onto a laser pulse.

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Section: Application To the Spectrally Encoded Electro-optic Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A single-shot, high-repetition rate scheme for electro-optic detection of short pulses

Roussel

Évain

Parquier³

et al. 2015

SPIE Proceedings

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“…As the main motivation, the patterns which spontaneously appear during an instability increase the terahertz radiation power by factors exceeding 10000 [5,6]. However the irregularity of these patterns [5][6][7][8][9][10][11] largely prevented applications of this powerful source. Here we show how to make the spatiotemporal patterns regular (and thus the emitted THz power) using a point of view borrowed from chaos control theory [12][13][14].…”

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confidence: 99%

Stable coherent terahertz synchrotron radiation from controlled relativistic electron bunches

et al. 2019

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Spontaneous formation of spatial structures (patterns) occurs in various contexts, ranging from sand dunes [1] and rogue wave formation [2,3], to traffic jams [4]. These last decades, very practical reasons also led to studies of pattern formation in relativistic electron bunches used in synchrotron radiation light sources. As the main motivation, the patterns which spontaneously appear during an instability increase the terahertz radiation power by factors exceeding 10000 [5,6]. However the irregularity of these patterns [5][6][7][8][9][10][11] largely prevented applications of this powerful source. Here we show how to make the spatiotemporal patterns regular (and thus the emitted THz power) using a point of view borrowed from chaos control theory [12][13][14]. Mathematically, regular unstable solutions are expected to coexist with the undesired irregular solutions, and may thus be controllable using feedback control. We demonstrate the stabilization of such regular solutions in the Synchrotron SOLEIL storage ring. Operation of these controlled unstable solutions enables new designs of high charge and stable synchrotron radiation sources.Synchrotron light sources are used worldwide to produce brilliant light from THz to hard X-rays, allowing to investigate a very large range of matter properties. In these sources where electron bunches travel at relativistic velocities, an ubiquitous phenomenon occurs when the bunch charge density exceeds a threshold value. Due to the interaction between the electron bunch and its own emitted electric field, micro-structures spontaneously appear in the longitudinal profile (and phase-space) of the bunch [7, 15-17] (see Fig. 1(a) and (b) for the SOLEIL storage ring which will be considered here). In storage rings, these structures are responsible for a huge emission of coherent light in the terahertz range, typically 10 3 − 10 5 times normal synchrotron radiation power density. However, as the micro-structures appear mostly in the form of bursts [ Fig. 1(d)] this type of source is barely usable in user applications. Hence, research in this domain has naturally attempted to find regions for which coherent emission (CSR) occurs while bursting dynamics * Corresponding author : clement.evain@univ-lille.fr is absent. Such "parameter search" methods succeeded in identifying parameter regions with stable coherent emission. However, this corresponds to special configurations (with short and low charge electron bunches, in the so-called low-alpha operation [5,6,10,11,[18][19][20][21][22][23]) which are not compatible with most of the user experiments. Therefore, this type of THz source is used in relatively few synchrotron radiation facilities (SOLEIL, DIAMOND, BESSY-II), and only during a small part of the year."Parameter search approaches" are however not the only possibilities for avoiding instabilities. The point of view that we will use here is directly borrowed from the so-called chaos control theory, introduced by Ott, Grebogi and Yorke (OGY) [12,13]. Mathematically, when an undesi...

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“…Pioneer experiments using a streak camera could visualize microstructures in the several GHz range at the VUV ring [40]. More recently, electron bunch shapes have been indirectly characterized in single-shot by using new detectors based on thin films of superconducting YBCO [41], and high repetition rate electro-optic sampling, using photonic time-stretch [37]. Although this progress enabled to record structures in single-shot up to the THz range, the obtained information concerned only the far-field (i.e., the synchrotron radiation) emitted by the microstructures [37,39,40].…”

mentioning

confidence: 99%

From self-organization in relativistic electron bunches to coherent synchrotron light: observation using a photonic time-stretch digitizer

Bielawski¹,

Blomley²,

Brosi³

et al. 2019

Sci Rep

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In recent and future synchrotron radiation facilities, relativistic electron bunches with increasingly high charge density are needed for producing brilliant light at various wavelengths, from X-rays to terahertz. In such conditions, interaction of electron bunches with their own emitted electromagnetic fields leads to instabilities and spontaneous formation of complex spatial structures. Understanding these instabilities is therefore key in most electron accelerators. However, investigations suffer from the lack of non-destructive recording tools for electron bunch shapes. In storage rings, most studies thus focus on the resulting emitted radiation. Here, we present measurements of the electric field in the immediate vicinity of the electron bunch in a storage ring, over many turns. For recording the ultrafast electric field, we designed a photonic time-stretch analog-to-digital converter with terasamples/second acquisition rate. We could thus observe the predicted link between spontaneous pattern formation and giant bursts of coherent synchrotron radiation in a storage ring.

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Observing microscopic structures of a relativistic object using a time-stretch strategy

Cited by 47 publications

References 29 publications

A single-shot, high-repetition rate scheme for electro-optic detection of short pulses

A single-shot, high-repetition rate scheme for electro-optic detection of short pulses

Stable coherent terahertz synchrotron radiation from controlled relativistic electron bunches

From self-organization in relativistic electron bunches to coherent synchrotron light: observation using a photonic time-stretch digitizer

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