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Di Mitri S, Barletta W, Bianco A, Cudin I, Diviacco B, Raimondi L, Spampinati S, Spezzani C, Masciovecchio C. Laser-slicing at a low-emittance storage ring. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1523-1538. [PMID: 31490140 DOI: 10.1107/s1600577519009901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 07/10/2019] [Indexed: 06/10/2023]
Abstract
Laser-slicing at a diffraction-limited storage ring light source in the soft X-ray region is investigated with theoretical and numerical modelling. It turns out that the slicing efficiency is favoured by the ultra-low beam emittance, and that slicing can be implemented without interference to the standard multi-bunch operation. Spatial and spectral separation of the sub-picosecond radiation pulse from a hundreds of picosecond-long background is achieved by virtue of 1:1 imaging of the radiation source. The spectral separation is enhanced when the radiator is a transverse gradient undulator. The proposed configuration applied to the Elettra 2.0 six-bend achromatic lattice envisages total slicing efficiency as high as 10-7, one order of magnitude larger than the demonstrated state-of-the-art, at the expense of pulse durations as long as 0.4 ps FWHM and average laser power as high as ∼40 W.
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Affiliation(s)
- Simone Di Mitri
- Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
| | - William Barletta
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Anna Bianco
- Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
| | - Ivan Cudin
- Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
| | - Bruno Diviacco
- Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
| | - Lorenzo Raimondi
- Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
| | | | - Carlo Spezzani
- Elettra - Sincrotrone Trieste SCpA, Basovizza, 34149 Trieste, Italy
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Coherent THz Emission Enhanced by Coherent Synchrotron Radiation Wakefield. Sci Rep 2018; 8:11661. [PMID: 30076346 PMCID: PMC6076281 DOI: 10.1038/s41598-018-30125-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 07/25/2018] [Indexed: 11/08/2022] Open
Abstract
We demonstrate that emission of coherent transition radiation by a ∼1 GeV energy-electron beam passing through an Al foil is enhanced in intensity and extended in frequency spectral range, by the energy correlation established along the beam by coherent synchrotron radiation wakefield, in the presence of a proper electron optics in the beam delivery system. Analytical and numerical models, based on experimental electron beam parameters collected at the FERMI free electron laser (FEL), predict transition radiation with two intensity peaks at ∼0.3 THz and ∼1.5 THz, and extending up to 8.5 THz with intensity above 20 dB w.r.t. the main peak. Up to 80-µJ pulse energy integrated over the full bandwidth is expected at the source, and in agreement with experimental pulse energy measurements. By virtue of its implementation in an FEL beam dump line, this work promises dissemination of user-oriented multi-THz beamlines parasitic and self-synchronized to EUV and x-ray FELs.
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Labat M, Brubach JB, Ciavardini A, Couprie ME, Elkaim E, Fertey P, Ferte T, Hollander P, Hubert N, Jal E, Laulhé C, Luning J, Marcouillé O, Moreno T, Morin P, Polack F, Prigent P, Ravy S, Ricaud JP, Roy P, Silly M, Sirotti F, Taleb A, Tordeux MA, Nadji A. Commissioning of a multi-beamline femtoslicing facility at SOLEIL. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:385-398. [PMID: 29488917 DOI: 10.1107/s1600577518000863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 11/21/2017] [Indexed: 06/08/2023]
Abstract
The investigation of ultrafast dynamics, taking place on the few to sub-picosecond time scale, is today a very active research area pursued in a variety of scientific domains. With the recent advent of X-ray free-electron lasers (XFELs), providing very intense X-ray pulses of duration as short as a few femtoseconds, this research field has gained further momentum. As a consequence, the demand for access strongly exceeds the capacity of the very few XFEL facilities existing worldwide. This situation motivates the development of alternative sub-picosecond pulsed X-ray sources among which femtoslicing facilities at synchrotron radiation storage rings are standing out due to their tunability over an extended photon energy range and their high stability. Following the success of the femtoslicing installations at ALS, BESSY-II, SLS and UVSOR, SOLEIL decided to implement a femtoslicing facility. Several challenges were faced, including operation at the highest electron beam energy ever, and achievement of slice separation exclusively with the natural dispersion function of the storage ring. SOLEIL's setup also enables, for the first time, delivering sub-picosecond pulses simultaneously to several beamlines. This last feature enlarges the experimental capabilities of the facility, which covers the soft and hard X-ray photon energy range. In this paper, the commissioning of this original femtoslicing facility is reported. Furthermore, it is shown that the slicing-induced THz signal can be used to derive a quantitative estimate for the degree of energy exchange between the femtosecond infrared laser pulse and the circulating electron bunch.
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Affiliation(s)
- Marie Labat
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | | | | | | | - Erik Elkaim
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Pierre Fertey
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Tom Ferte
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France
| | | | - Nicolas Hubert
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Emmanuelle Jal
- Sorbonne Universités, UPMC Université Paris 06, CNRS, Laboratoire de Chimie Physique - Matière et Rayonnement, 75005 Paris, France
| | - Claire Laulhé
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Jan Luning
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | | | - Thierry Moreno
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Paul Morin
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Francois Polack
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Pascale Prigent
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Sylvain Ravy
- Laboratoire de Physique des Solides, Université Paris-Sud, F-91405 Orsay Cedex, France
| | | | - Pascale Roy
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Mathieu Silly
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Fausto Sirotti
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | - Amina Taleb
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
| | | | - Amor Nadji
- Synchrotron SOLEIL, Saint-Aubin, 91191 Gif-sur-Yvette, France
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Stepanov AG, Hauri CP. Short X-ray pulses from third-generation light sources. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:141-151. [PMID: 26698056 DOI: 10.1107/s1600577515019281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 10/12/2015] [Indexed: 06/05/2023]
Abstract
High-brightness X-ray radiation produced by third-generation synchrotron light sources (TGLS) has been used for numerous time-resolved investigations in many different scientific fields. The typical time duration of X-ray pulses delivered by these large-scale machines is about 50-100 ps. A growing number of time-resolved studies would benefit from X-ray pulses with two or three orders of magnitude shorter duration. Here, techniques explored in the past for shorter X-ray pulse emission at TGLS are reviewed and the perspective towards the realisation of picosecond and sub-picosecond X-ray pulses are discussed.
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Affiliation(s)
- A G Stepanov
- Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - C P Hauri
- Paul Scherrer Institute, 5232 Villigen, Switzerland
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Goodfellow J, Fuchs M, Daranciang D, Ghimire S, Chen F, Loos H, Reis DA, Fisher AS, Lindenberg AM. Below gap optical absorption in GaAs driven by intense, single-cycle coherent transition radiation. OPTICS EXPRESS 2014; 22:17423-17429. [PMID: 25090555 DOI: 10.1364/oe.22.017423] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Single-cycle terahertz fields generated by coherent transition radiation from a relativistic electron beam are used to study the high field optical response of single crystal GaAs. Large amplitude changes in the sub-band-gap optical absorption are induced and probed dynamically by measuring the absorption of a broad-band optical beam generated by transition radiation from the same electron bunch, providing an absolutely synchronized pump and probe geometry. This modification of the optical properties is consistent with strong-field-induced electroabsorption. These processes are pertinent to a wide range of nonlinear terahertz-driven light-matter interactions anticipated at accelerator-based sources.
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Abstract
Infrared radiation from the near- to the far-infrared (terahertz) region of the electromagnetic spectrum is extensively used for many different purposes. Accelerator-based sources of infrared and terahertz radiation have become well-accepted research tools. This article introduces the physics processes underlying the generation of infrared radiation by different methods. Special emphasis is put on the interesting properties of coherent radiation, and the corresponding accelerator requirements are discussed. Finally, the various available accelerator-based sources are compared in view of different figures of merit.
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Affiliation(s)
- Anke-Susanne Müller
- Institute for Synchrotron Radiation and Laboratory for the Application of Synchrotron Radiation, Karlsruhe Institute of Technology, Kaiserstrasse 12, 76131 Karlsruhe, Germany
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Shen Y, Yang X, Carr GL, Hidaka Y, Murphy JB, Wang X. Tunable few-cycle and multicycle coherent terahertz radiation from relativistic electrons. PHYSICAL REVIEW LETTERS 2011; 107:204801. [PMID: 22181737 DOI: 10.1103/physrevlett.107.204801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Indexed: 05/31/2023]
Abstract
We report the generation of tunable, narrow-band, few-cycle and multicycle coherent terahertz (THz) pulses from a temporally modulated relativistic electron beam. We demonstrate that the frequency of the THz radiation and the number of the oscillation cycles of the THz electric field can be tuned by changing the modulation period of the electron beam through a temporally shaped photocathode drive laser. The central frequency of the THz spectrum is tunable from ∼0.26 to 2.6 THz with a bandwidth of ∼0.16 THz.
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Affiliation(s)
- Yuzhen Shen
- National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA
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Byrd JM, Hao Z, Martin MC, Robin DS, Sannibale F, Schoenlein RW, Zholents AA, Zolotorev MS. Laser seeding of the storage-ring microbunching instability for high-power coherent terahertz radiation. PHYSICAL REVIEW LETTERS 2006; 97:074802. [PMID: 17026236 DOI: 10.1103/physrevlett.97.074802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2006] [Indexed: 05/12/2023]
Abstract
We report the first observation of laser seeding of the storage-ring microbunching instability. Above a threshold bunch current, the interaction of the beam and its radiation results in a coherent instability, observed as a series of stochastic bursts of coherent synchrotron radiation (CSR) at terahertz frequencies initiated by fluctuations in the beam density. We have observed that this effect can be seeded by imprinting an initial density modulation on the beam by means of laser "slicing." In such a situation, most of the bursts of CSR become synchronous with the pulses of the modulating laser and their average intensity scales exponentially with the current per bunch. We present detailed experimental observations of the seeding effect and a model of the phenomenon. This seeding mechanism also creates potential applications as a high-power source of CSR at terahertz frequencies.
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Affiliation(s)
- J M Byrd
- Ernest Orlando Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA
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