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Walsh DA, Lake DS, Snedden EW, Cliffe MJ, Graham DM, Jamison SP. Demonstration of sub-luminal propagation of single-cycle terahertz pulses for particle acceleration. Nat Commun 2017; 8:421. [PMID: 28871091 PMCID: PMC5583180 DOI: 10.1038/s41467-017-00490-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 06/29/2017] [Indexed: 11/09/2022] Open
Abstract
The sub-luminal phase velocity of electromagnetic waves in free space is generally unobtainable, being closely linked to forbidden faster than light group velocities. The requirement of sub-luminal phase-velocity in laser-driven particle acceleration schemes imposes a limit on the total acceleration achievable in free space, and necessitates the use of dispersive structures or waveguides for extending the field-particle interaction. We demonstrate a travelling source approach that overcomes the sub-luminal propagation limits. The approach exploits ultrafast optical sources with slow group velocity propagation, and a group-to-phase front conversion through nonlinear optical interaction. The concept is demonstrated with two terahertz generation processes, nonlinear optical rectification and current-surge rectification. We report measurements of longitudinally polarised single-cycle electric fields with phase and group velocity between 0.77c and 1.75c. The ability to scale to multi-megavolt-per-metre field strengths is demonstrated. Our approach paves the way towards the realisation of cheap and compact particle accelerators with femtosecond scale control of particles.Controlled generation of terahertz radiation with subluminal phase velocities is a key issue in laser-driven particle acceleration. Here, the authors demonstrate a travelling-source approach utilizing the group-to-phase front conversion to overcome the sub-luminal propagation limit.
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Affiliation(s)
- D A Walsh
- Accelerator Science and Technology Centre, Science and Technology Facilities Council, Daresbury Laboratory, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.,The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK
| | - D S Lake
- The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.,School of Physics and Astronomy & Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK
| | - E W Snedden
- Accelerator Science and Technology Centre, Science and Technology Facilities Council, Daresbury Laboratory, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.,The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK
| | - M J Cliffe
- The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.,School of Physics and Astronomy & Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK
| | - D M Graham
- The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.,School of Physics and Astronomy & Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK
| | - S P Jamison
- Accelerator Science and Technology Centre, Science and Technology Facilities Council, Daresbury Laboratory, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK. .,The Cockcroft Institute, Sci-Tech Daresbury, Keckwick Lane, Daresbury, Warrington, WA4 4AD, UK.
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Wang D, Antipov S, Jing C, Power JG, Conde M, Wisniewski E, Liu W, Qiu J, Ha G, Dolgashev V, Tang C, Gai W. Interaction of an Ultrarelativistic Electron Bunch Train with a W-Band Accelerating Structure: High Power and High Gradient. PHYSICAL REVIEW LETTERS 2016; 116:054801. [PMID: 26894715 DOI: 10.1103/physrevlett.116.054801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Indexed: 06/05/2023]
Abstract
Electron beam interaction with high frequency structures (beyond microwave regime) has a great impact on future high energy frontier machines. We report on the generation of multimegawatt pulsed rf power at 91 GHz in a planar metallic accelerating structure driven by an ultrarelativistic electron bunch train. This slow-wave wakefield device can also be used for high gradient acceleration of electrons with a stable rf phase and amplitude which are controlled by manipulation of the bunch train. To achieve precise control of the rf pulse properties, a two-beam wakefield interferometry method was developed in which the rf pulse, due to the interference of the wakefields from the two bunches, was measured as a function of bunch separation. Measurements of the energy change of a trailing electron bunch as a function of the bunch separation confirmed the interferometry method.
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Affiliation(s)
- D Wang
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Tsinghua University, Beijing, 100084, China
| | - S Antipov
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Euclid Techlabs LLC, Solon, Ohio 44139, USA
| | - C Jing
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Euclid Techlabs LLC, Solon, Ohio 44139, USA
| | - J G Power
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - M Conde
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - E Wisniewski
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - W Liu
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - J Qiu
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Euclid Techlabs LLC, Solon, Ohio 44139, USA
| | - G Ha
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - V Dolgashev
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - C Tang
- Tsinghua University, Beijing, 100084, China
| | - W Gai
- High Energy Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
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Banna S, Berezovsky V, Schächter L. Experimental observation of direct particle acceleration by stimulated emission of radiation. PHYSICAL REVIEW LETTERS 2006; 97:134801. [PMID: 17026038 DOI: 10.1103/physrevlett.97.134801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2006] [Indexed: 05/12/2023]
Abstract
We report the first experimental evidence for direct particle acceleration by stimulated emission of radiation. In the framework of this proof-of-principle experiment, a 45 MeV electron macrobunch was modulated by a high-power CO2 laser and then injected into an excited CO2 gas mixture. The emerging microbunches experienced a 0.15% relative change in the kinetic energy, in a less than 40 cm long interaction region. According to our experimental results, a fraction of these electrons have gained more than 200 keV each, implying that such an electron has undergone an order of magnitude of 2 x 10(6) collisions of the second kind.
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Affiliation(s)
- Samer Banna
- Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
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Smirnova EI, Kesar AS, Mastovsky I, Shapiro MA, Temkin RJ. Demonstration of a 17-GHz, high-gradient accelerator with a photonic-band-gap structure. PHYSICAL REVIEW LETTERS 2005; 95:074801. [PMID: 16196787 DOI: 10.1103/physrevlett.95.074801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Indexed: 05/04/2023]
Abstract
We report the testing of a high gradient electron accelerator with a photonic-band-gap (PBG) structure. The photonic-band-gap structure confines a fundamental TM(01)-like accelerating mode, but does not support higher-order modes (HOM). The absence of HOM is a major advantage of the PBG accelerator, since it suppresses dangerous beam instabilities caused by wakefields. The PBG structure was designed as a triangular lattice of metal rods with a missing central rod forming a defect confining the TM(01)-like mode and allowing the electron beam to propagate along the axis. The design frequency of the six-cell structure was 17.14 GHz. The PBG structure was excited by 2 MW, 100 ns pulses. A 16.5 MeV electron beam was transmitted through the PBG accelerator. The observed electron beam energy gain of 1.4 MeV corresponds to an accelerating gradient of 35 MV/m, in excellent agreement with theory.
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Affiliation(s)
- Evgenya I Smirnova
- Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, 02139, USA.
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