1
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Bohlen S, Brümmer T, Grüner F, Lindstrøm CA, Meisel M, Staufer T, Streeter MJV, Veale MC, Wood JC, D'Arcy R, Põder K, Osterhoff J. In Situ Measurement of Electron Energy Evolution in a Laser-Plasma Accelerator. Phys Rev Lett 2022; 129:244801. [PMID: 36563240 DOI: 10.1103/physrevlett.129.244801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 07/22/2022] [Accepted: 10/12/2022] [Indexed: 06/17/2023]
Abstract
We report on a novel, noninvasive method applying Thomson scattering to measure the evolution of the electron beam energy inside a laser-plasma accelerator with high spatial resolution. The determination of the local electron energy enabled the in-situ detection of the acting acceleration fields without altering the final beam state. In this Letter we demonstrate that the accelerating fields evolve from (265±119) GV/m to (9±4) GV/m in a plasma density ramp. The presented data show excellent agreement with particle-in-cell simulations. This method provides new possibilities for detecting the dynamics of plasma-based accelerators and their optimization.
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Affiliation(s)
- S Bohlen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - T Brümmer
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - F Grüner
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - C A Lindstrøm
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M Meisel
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - T Staufer
- Universität Hamburg and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M J V Streeter
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, Belfast, United Kingdom
| | - M C Veale
- UKRI STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, United Kingdom
| | - J C Wood
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - K Põder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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2
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Boyle GJ, Thévenet M, Chappell J, Garland JM, Loisch G, Osterhoff J, D'Arcy R. Reduced model of plasma evolution in hydrogen discharge capillary plasmas. Phys Rev E 2021; 104:015211. [PMID: 34412295 DOI: 10.1103/physreve.104.015211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 06/23/2021] [Indexed: 11/07/2022]
Abstract
A model describing the evolution of the average plasma temperature inside a discharge capillary device including Ohmic heating, heat loss to the capillary wall, and ionization and recombination effects is developed. Key to this approach is an analytic quasistatic description of the radial temperature variation which, under local thermal equilibrium conditions, allows the radial behavior of both the plasma temperature and the electron density to be specified directly from the average temperature evolution. In this way, the standard set of coupled partial differential equations for magnetohydrodynamic (MHD) simulations is replaced by a single ordinary differential equation, with a corresponding gain in simplicity and computational efficiency. The on-axis plasma temperature and electron density calculations are benchmarked against existing one-dimensional MHD simulations for hydrogen plasmas under a range of discharge conditions and initial gas pressures, and good agreement is demonstrated. The success of this simple model indicates that it can serve as a quick and easy tool for evaluating the plasma conditions in discharge capillary devices, particularly for computationally expensive applications such as simulating long-term plasma evolution, performing detailed input parameter scans, or for optimization using machine-learning techniques.
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Affiliation(s)
- G J Boyle
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M Thévenet
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Chappell
- University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - J M Garland
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - G Loisch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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3
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Schröder S, Lindstrøm CA, Bohlen S, Boyle G, D'Arcy R, Diederichs S, Garland MJ, Gonzalez P, Knetsch A, Libov V, Niknejadi P, Põder K, Schaper L, Schmidt B, Sheeran B, Tauscher G, Wesch S, Zemella J, Zeng M, Osterhoff J. Author Correction: High-resolution sampling of beam-driven plasma wakefields. Nat Commun 2021; 12:371. [PMID: 33420017 PMCID: PMC7794482 DOI: 10.1038/s41467-020-20676-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- S Schröder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany. .,Universität Hamburg, Mittelweg 177, 20148, Hamburg, Germany.
| | - C A Lindstrøm
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - S Bohlen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Universität Hamburg, Mittelweg 177, 20148, Hamburg, Germany
| | - G Boyle
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - S Diederichs
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Universität Hamburg, Mittelweg 177, 20148, Hamburg, Germany
| | - M J Garland
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - P Gonzalez
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Universität Hamburg, Mittelweg 177, 20148, Hamburg, Germany
| | - A Knetsch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - V Libov
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - P Niknejadi
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Kris Põder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - L Schaper
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - B Schmidt
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - B Sheeran
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Universität Hamburg, Mittelweg 177, 20148, Hamburg, Germany
| | - G Tauscher
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.,Universität Hamburg, Mittelweg 177, 20148, Hamburg, Germany
| | - S Wesch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - J Zemella
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - M Zeng
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
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4
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Lindstrøm CA, Garland JM, Schröder S, Boulton L, Boyle G, Chappell J, D'Arcy R, Gonzalez P, Knetsch A, Libov V, Loisch G, Martinez de la Ossa A, Niknejadi P, Põder K, Schaper L, Schmidt B, Sheeran B, Wesch S, Wood J, Osterhoff J. Energy-Spread Preservation and High Efficiency in a Plasma-Wakefield Accelerator. Phys Rev Lett 2021; 126:014801. [PMID: 33480753 DOI: 10.1103/physrevlett.126.014801] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 11/05/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
Energy-efficient plasma-wakefield acceleration of particle bunches with low energy spread is a promising path to realizing compact free-electron lasers and particle colliders. High efficiency and low energy spread can be achieved simultaneously by strong beam loading of plasma wakefields when accelerating bunches with carefully tailored current profiles [M. Tzoufras et al., Phys. Rev. Lett. 101, 145002 (2008)PRLTAO0031-900710.1103/PhysRevLett.101.145002]. We experimentally demonstrate such optimal beam loading in a nonlinear electron-driven plasma accelerator. Bunches with an initial energy of 1 GeV were accelerated by 45 MeV with an energy-transfer efficiency of (42±4)% at a gradient of 1.3 GV/m while preserving per-mille energy spreads with full charge coupling, demonstrating wakefield flattening at the few-percent level.
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Affiliation(s)
- C A Lindstrøm
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J M Garland
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - S Schröder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - L Boulton
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- SUPA, Department of Physics, University of Strathclyde, Glasgow, United Kingdom
- The Cockcroft Institute, Daresbury, United Kingdom
| | - G Boyle
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Chappell
- University College London, London, United Kingdom
| | - R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - P Gonzalez
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - A Knetsch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - V Libov
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - G Loisch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | | | - P Niknejadi
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - K Põder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - L Schaper
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - B Schmidt
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - B Sheeran
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S Wesch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Wood
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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5
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Garland JM, Tauscher G, Bohlen S, Boyle GJ, D'Arcy R, Goldberg L, Põder K, Schaper L, Schmidt B, Osterhoff J. Combining laser interferometry and plasma spectroscopy for spatially resolved high-sensitivity plasma density measurements in discharge capillaries. Rev Sci Instrum 2021; 92:013505. [PMID: 33514233 DOI: 10.1063/5.0021117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 12/20/2020] [Indexed: 06/12/2023]
Abstract
Precise characterization and tailoring of the spatial and temporal evolution of plasma density within plasma sources are critical for realizing high-quality accelerated beams in plasma wakefield accelerators. The simultaneous use of two independent diagnostics allowed the temporally and spatially resolved detection of plasma density with unprecedented sensitivity and enabled the characterization of the plasma temperature in discharge capillaries for times later than 0.5 µs after the initiation of the discharge, at which point the plasma is at local thermodynamic equilibrium. A common-path two-color laser interferometer for obtaining the average plasma density with a sensitivity of 2 × 1015 cm-2 was developed together with a plasma emission spectrometer for analyzing spectral line broadening profiles with a resolution of 5 × 1015 cm-3. Both diagnostics show good agreement when applying the spectral line broadening analysis methodology of Gigosos and Cardeñoso in the temperature range of 0.5 eV-5.0 eV. For plasma with densities of 0.5-2.5 × 1017 cm-3, temperatures of 1 eV-7 eV were indirectly measured by combining the diagnostic information. Measured longitudinally resolved plasma density profiles exhibit a clear temporal evolution from an initial flat-top to a Gaussian-like shape in the first microseconds as material is ejected out from the capillary. These measurements pave the way for highly detailed parameter tuning in plasma sources for particle accelerators and beam optics.
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Affiliation(s)
- J M Garland
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - G Tauscher
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - S Bohlen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - G J Boyle
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - L Goldberg
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - K Põder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - L Schaper
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - B Schmidt
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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6
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Hajra SG, Liu C, Sepehri K, Proulx R, Song X, Badragan I, D'Arcy R, Murray D, Krauze A. Towards Improved Medical Imaging Analysis for Oncology Care: Clinical Experience with Simulation Platform for Brain Tumors. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.2477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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D'Arcy R, Aschikhin A, Bohlen S, Boyle G, Brümmer T, Chappell J, Diederichs S, Foster B, Garland MJ, Goldberg L, Gonzalez P, Karstensen S, Knetsch A, Kuang P, Libov V, Ludwig K, Martinez de la Ossa A, Marutzky F, Meisel M, Mehrling TJ, Niknejadi P, Põder K, Pourmoussavi P, Quast M, Röckemann JH, Schaper L, Schmidt B, Schröder S, Schwinkendorf JP, Sheeran B, Tauscher G, Wesch S, Wing M, Winkler P, Zeng M, Osterhoff J. FLASHForward: plasma wakefield accelerator science for high-average-power applications. Philos Trans A Math Phys Eng Sci 2019; 377:20180392. [PMID: 31230573 PMCID: PMC6602913 DOI: 10.1098/rsta.2018.0392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/30/2019] [Indexed: 06/09/2023]
Abstract
The FLASHForward experimental facility is a high-performance test-bed for precision plasma wakefield research, aiming to accelerate high-quality electron beams to GeV-levels in a few centimetres of ionized gas. The plasma is created by ionizing gas in a gas cell either by a high-voltage discharge or a high-intensity laser pulse. The electrons to be accelerated will either be injected internally from the plasma background or externally from the FLASH superconducting RF front end. In both cases, the wakefield will be driven by electron beams provided by the FLASH gun and linac modules operating with a 10 Hz macro-pulse structure, generating 1.25 GeV, 1 nC electron bunches at up to 3 MHz micro-pulse repetition rates. At full capacity, this FLASH bunch-train structure corresponds to 30 kW of average power, orders of magnitude higher than drivers available to other state-of-the-art LWFA and PWFA experiments. This high-power functionality means FLASHForward is the only plasma wakefield facility in the world with the immediate capability to develop, explore and benchmark high-average-power plasma wakefield research essential for next-generation facilities. The operational parameters and technical highlights of the experiment are discussed, as well as the scientific goals and high-average-power outlook. This article is part of the Theo Murphy meeting issue 'Directions in particle beam-driven plasma wakefield acceleration'.
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Affiliation(s)
- R. D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - A. Aschikhin
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S. Bohlen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - G. Boyle
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - T. Brümmer
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J. Chappell
- University College London, Gower Street, London WC1E 6BT, UK
| | - S. Diederichs
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - B. Foster
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- University of Oxford, Wellington Square, Oxford OX1 2JD, UK
| | - M. J. Garland
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - L. Goldberg
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - P. Gonzalez
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S. Karstensen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - A. Knetsch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - P. Kuang
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - V. Libov
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - K. Ludwig
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - A. Martinez de la Ossa
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - F. Marutzky
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M. Meisel
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - T. J. Mehrling
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA
| | - P. Niknejadi
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - K. Põder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - P. Pourmoussavi
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M. Quast
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - J. -H. Röckemann
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - L. Schaper
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - B. Schmidt
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - S. Schröder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - J. -P. Schwinkendorf
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - B. Sheeran
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - G. Tauscher
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S. Wesch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M. Wing
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- University College London, Gower Street, London WC1E 6BT, UK
| | - P. Winkler
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M. Zeng
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J. Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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8
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D'Arcy R, Wesch S, Aschikhin A, Bohlen S, Behrens C, Garland MJ, Goldberg L, Gonzalez P, Knetsch A, Libov V, de la Ossa AM, Meisel M, Mehrling TJ, Niknejadi P, Poder K, Röckemann JH, Schaper L, Schmidt B, Schröder S, Palmer C, Schwinkendorf JP, Sheeran B, Streeter MJV, Tauscher G, Wacker V, Osterhoff J. Tunable Plasma-Based Energy Dechirper. Phys Rev Lett 2019; 122:034801. [PMID: 30735413 DOI: 10.1103/physrevlett.122.034801] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Indexed: 06/09/2023]
Abstract
A tunable plasma-based energy dechirper has been developed at FLASHForward to remove the correlated energy spread of a 681 MeV electron bunch. Through the interaction of the bunch with wakefields excited in plasma the projected energy spread was reduced from a FWHM of 1.31% to 0.33% without reducing the stability of the incoming beam. The experimental results for variable plasma density are in good agreement with analytic predictions and three-dimensional simulations. The proof-of-principle dechirping strength of 1.8 GeV/mm/m significantly exceeds those demonstrated for competing state-of-the-art techniques and may be key to future plasma wakefield-based free-electron lasers and high energy physics facilities, where large intrinsic chirps need to be removed.
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Affiliation(s)
- R D'Arcy
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - S Wesch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - A Aschikhin
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - S Bohlen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - C Behrens
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - M J Garland
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - L Goldberg
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - P Gonzalez
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - A Knetsch
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - V Libov
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - A Martinez de la Ossa
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M Meisel
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - T J Mehrling
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
| | - P Niknejadi
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - K Poder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J-H Röckemann
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - L Schaper
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - B Schmidt
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - S Schröder
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - C Palmer
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- University of Oxford, Wellington Square, Oxford OX1 2JD, United Kingdom
| | - J-P Schwinkendorf
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - B Sheeran
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - M J V Streeter
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Imperial College London, Kensington, London SW7 2AZ, United Kingdom
| | - G Tauscher
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - V Wacker
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - J Osterhoff
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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9
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McCall SJ, Bunch KJ, Brocklehurst P, D'Arcy R, Hinshaw K, Kurinczuk JJ, Lucas DN, Stenson B, Tuffnell DJ, Knight M. The incidence, characteristics, management and outcomes of anaphylaxis in pregnancy: a population-based descriptive study. BJOG 2018; 125:965-971. [PMID: 29193647 PMCID: PMC6033185 DOI: 10.1111/1471-0528.15041] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/21/2017] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The aim of this study was to estimate the incidence of anaphylaxis in pregnancy and describe the management and outcomes in the UK. DESIGN A population-based descriptive study using the UK Obstetric Surveillance System (UKOSS). SETTING All consultant-led maternity units in the UK. POPULATION All pregnant women who had anaphylaxis between 1 October 2012 and 30 September 2015. Anaphylaxis was defined as a severe, life-threatening generalised or systemic hypersensitivity reaction. METHODS Prospective case notification using UKOSS. MAIN OUTCOME MEASURES Maternal mortality, severe maternal morbidity, neonatal mortality and severe neonatal morbidity. RESULTS There were 37 confirmed cases of anaphylaxis in pregnancy, giving an estimated incidence of 1.6 (95% CI: 1.1-2.2) per 100 000 maternities. Four cases of anaphylaxis were in women with known penicillin allergies: two received co-amoxiclav and two cephalosporins. Twelve women had anaphylaxis following prophylactic use of antibiotics at the time of a caesarean delivery. Prophylactic use of antibiotics for Group B streptococcal infection accounted for anaphylaxis in one woman. Two women died (5%), 14 (38%) women were admitted to intensive care and seven women (19%) had one or more additional severe maternal morbidities, which included three haemorrhagic events, two cardiac arrests, one thrombotic event and one pneumonia. No infants died; however, in those infants whose mother had anaphylaxis before delivery (n = 18) there were seven (41%) neonatal intensive care unit admissions, three preterm births and one baby was cooled for neonatal encephalopathy. CONCLUSIONS Anaphylaxis is a rare severe complication of pregnancy and frequently the result of a reaction to antibiotic administration. This study highlights the seriousness of the outcomes of this condition for the mother. The low incidence is reassuring given the large proportion of the pregnant population that receive prophylactic antibiotics during delivery. TWEETABLE ABSTRACT Anaphylaxis is a rare severe complication of pregnancy and frequently the result of a reaction to antibiotic administration.
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Affiliation(s)
- SJ McCall
- Policy Research Unit in Maternal Health and CareNational Perinatal Epidemiology Unit (NPEU)Nuffield Department of Population HealthUniversity of OxfordOxfordUK
| | - KJ Bunch
- Policy Research Unit in Maternal Health and CareNational Perinatal Epidemiology Unit (NPEU)Nuffield Department of Population HealthUniversity of OxfordOxfordUK
| | - P Brocklehurst
- Policy Research Unit in Maternal Health and CareNational Perinatal Epidemiology Unit (NPEU)Nuffield Department of Population HealthUniversity of OxfordOxfordUK
- Birmingham Clinical Trials UnitUniversity of BirminghamBirminghamUK
| | - R D'Arcy
- Nuffield Department of Obstetrics and GynaecologyJohn Radcliffe HospitalUniversity of OxfordOxfordUK
| | - K Hinshaw
- Department of Obstetrics and GynaecologySunderland Royal HospitalSunderlandUK
| | - JJ Kurinczuk
- Policy Research Unit in Maternal Health and CareNational Perinatal Epidemiology Unit (NPEU)Nuffield Department of Population HealthUniversity of OxfordOxfordUK
| | - DN Lucas
- Department of AnaestheticsNorthwick Park HospitalLondonUK
| | - B Stenson
- Neonatal UnitRoyal Infirmary of EdinburghEdinburghUK
| | - DJ Tuffnell
- Teaching Hospitals Foundation NHS TrustBradfordUK
| | - M Knight
- Policy Research Unit in Maternal Health and CareNational Perinatal Epidemiology Unit (NPEU)Nuffield Department of Population HealthUniversity of OxfordOxfordUK
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10
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D'Arcy R, McDonnell M, Spence K, Courtney CH. Exogenous T3 toxicosis following consumption of a contaminated weight loss supplement. Endocrinol Diabetes Metab Case Rep 2017; 2017:EDM170087. [PMID: 28883920 PMCID: PMC5581371 DOI: 10.1530/edm-17-0087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Accepted: 07/07/2017] [Indexed: 11/08/2022] Open
Abstract
A 42-year-old male presented with a one-week history of palpitations and sweating episodes. The only significant history was of longstanding idiopathic dilated cardiomyopathy. Initial ECG demonstrated a sinus tachycardia. Thyroid function testing, undertaken as part of the diagnostic workup, revealed an un-measureable thyroid-stimulating hormone (TSH) and free thyroxine (T4). Upon questioning the patient reported classical thyrotoxic symptoms over the preceding weeks. Given the persistence of symptoms free tri-iodothyronine (T3) was measured and found to be markedly elevated at 48.9 pmol/L (normal range: 3.1-6.8 pmol/L). No goitre or nodular disease was palpable in the neck. Historically there had never been any amiodarone usage. Radionucleotide thyroid uptake imaging (123I) demonstrated significantly reduced tracer uptake in the thyroid. Upon further questioning the patient reported purchasing a weight loss product online from India which supposedly contained sibutramine. He provided one of the tablets and laboratory analysis confirmed the presence of T3 in the tablet. Full symptomatic resolution and normalised thyroid function ensued upon discontinuation of the supplement. LEARNING POINTS Free tri-iodothyronine (T3) measurement may be useful in the presence of symptoms suggestive of thyrotoxicosis with discordant thyroid function tests.Thyroid uptake scanning can be a useful aid to differentiating exogenous hormone exposure from endogenous hyperthyroidism.Ingestion of thyroid hormone may be inadvertent in cases of exogenous thyrotoxicosis.Medicines and supplements sourced online for weight loss may contain thyroxine (T4) or T3 and should be considered as a cause of unexplained exogenous hyperthyroidism.
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Affiliation(s)
- R D'Arcy
- Regional Centre for Endocrinology, Royal Victoria Hospital, BelfastUK
| | - M McDonnell
- Regional Centre for Endocrinology, Royal Victoria Hospital, BelfastUK
| | - K Spence
- Regional Centre for Endocrinology, Royal Victoria Hospital, BelfastUK
| | - C H Courtney
- Regional Centre for Endocrinology, Royal Victoria Hospital, BelfastUK
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11
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Huang V, Kamarn J, D'Arcy R, Kohli K. SU-G-IeP2-02: A Proposed Solution to Accurate Delineation of External Body Contour Within CT Extended Field of View (eFOV) and the Evaluation of Dosimetric Impact from Image Distortion in EFOV. Med Phys 2016. [DOI: 10.1118/1.4957007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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12
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Dillen K, Gawryluk J, Stevens T, Bowen C, Beyea S, Liu C, Newman A, Schmidt M, Eskes G, Stroink G, Schmidt M, Clarke D, D'Arcy R. Characterizing the effects of magnetic field strength on specificity in functional MRI: Application in pre-surgical mapping. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)71595-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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13
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Abstract
Gap junctional intercellular communication (GJIC) has been proposed as a cellular mechanism for tumour suppression and there is experimental evidence in support of this. If aberrant GJIC contributes to the formation of human breast tumours, one might expect that the connexins (gap junction proteins) expressed by epithelial cells in normal human breast would be down-regulated in tumour epithelial cells, or that tumour cells might show aberrant expression of other connexin family members. This study examines the immunocytochemical expression of connexins 26 (Cx26) and 43 (Cx43) in normal human breast, 11 benign breast lesions, two special-type carcinomas, and 27 invasive carcinomas of no special histological type (NST). Cx26 generally was not expressed at detectable level in normal human breast, but punctate Cx43 immunostaining of the myoepithelial cells was found. Cx43 staining of the myoepithelium was also a feature of the benign lesions and ductal carcinoma in situ (DCIS). In general, the epithelial cells of benign lesions failed to stain for either connexin. Similarly, a lobular carcinoma did not express Cx26 or Cx43, but there was punctate Cx43 in the epithelial cells of a mucoid carcinoma. Cx26 was up-regulated in the carcinoma cells of 15 of the 27 invasive NST carcinomas, although the staining was usually cytoplasmic and heterogeneous. Cx43 was expressed by stromal cells, possibly myofibroblasts, in all NST carcinomas. Furthermore, there was heterogeneous Cx43 expression in the carcinoma cells of 14 of the 27 NST carcinomas and the staining was often intercellular and punctate, characteristic of functional connexins. Up-regulated of Cx26 and/or Cx43 in the carcinoma cells of over two-thirds of invasive lesions of NST is not necessarily inconsistent with a tumour suppressor role for GJIC. However, the role of gap junctions in the formation and progression of solid human tumours is likely to be more complex than indicated from experimental systems.
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Affiliation(s)
- S Jamieson
- Department of Surgery, Western Infirmary, Glasgow, U.K
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14
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Abstract
Gap junctional intercellular communication (GJIC) has been proposed as a cellular mechanism for tumour suppression and there is experimental evidence in support of this. If aberrant GJIC contributes to the formation of human breast tumours, one might expect that the connexins (gap junction proteins) expressed by epithelial cells in normal human breast would be down-regulated in tumour epithelial cells, or that tumour cells might show aberrant expression of other connexin family members. This study examines the immunocytochemical expression of connexins 26 (Cx26) and 43 (Cx43) in normal human breast, 11 benign breast lesions, two special-type carcinomas, and 27 invasive carcinomas of no special histological type (NST). Cx26 generally was not expressed at detectable level in normal human breast, but punctate Cx43 immunostaining of the myoepithelial cells was found. Cx43 staining of the myoepithelium was also a feature of the benign lesions and ductal carcinoma in situ (DCIS). In general, the epithelial cells of benign lesions failed to stain for either connexin. Similarly, a lobular carcinoma did not express Cx26 or Cx43, but there was punctate Cx43 in the epithelial cells of a mucoid carcinoma. Cx26 was up-regulated in the carcinoma cells of 15 of the 27 invasive NST carcinomas, although the staining was usually cytoplasmic and heterogeneous. Cx43 was expressed by stromal cells, possibly myofibroblasts, in all NST carcinomas. Furthermore, there was heterogeneous Cx43 expression in the carcinoma cells of 14 of the 27 NST carcinomas and the staining was often intercellular and punctate, characteristic of functional connexins. Up-regulated of Cx26 and/or Cx43 in the carcinoma cells of over two-thirds of invasive lesions of NST is not necessarily inconsistent with a tumour suppressor role for GJIC. However, the role of gap junctions in the formation and progression of solid human tumours is likely to be more complex than indicated from experimental systems.
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Affiliation(s)
- S Jamieson
- Department of Surgery, Western Infirmary, Glasgow, U.K
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D'Arcy R, Grob CA, Kaffenberger T, Krasnobajew V. Die synchrone Fragmentierung von γ-Amino-cycloalkylhalogeniden. 3. Teil. 4-Chlorpiperidine Fragmentierungsrcaktionen, 13. Mitteilung. Helv Chim Acta 1966. [DOI: 10.1002/hlca.660490125] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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