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  • 1
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    Parameter study for enhanced high gain harmonic generation scheme (2011)
    Institute of Physics (IOP)
    Details
    Publication Date: 2011-09-17
    Description: An easy-to-implement scheme called Enhanced High Gain Harmonic Generation is expected to be able to significantly enhance the performance of HG-FEL. In this paper we investigate the effects of the system parameters in the new scheme, including the electron energy detuning, initial electron-beam energy spread, seeding laser power, dispersive field strength and amount of the phase shift, etc. The numerical results from GENESIS (3D-code) are presented and show that the new scheme has acceptable parameters tolerance requirements and is no more or even less sensitive to the system parameters than that of the existing scheme; With the electron energy above the resonance, the efficiency is enhanced for both the new scheme and the existing scheme compared with the resonant energy case.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 2
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    Constraining the infrared behavior of the soft-wall AdS/QCD model (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-05-22
    Description: Author(s): Ya-Li He and Peng Zhang By requiring the correct Regge behavior in both meson and nucleon sectors, we determine the infrared asymptotic behavior of various background fields in the soft-wall anti-de Sitter/QCD model, including the dilaton, the warp factor, and the scalar vacuum expectation value. We then use a simple param... [Phys. Rev. D 85, 094021] Published Mon May 21, 2012
    Keywords: Strong interactions & Lattice methods
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Harmonics suppression effect of the quasi-periodic undulator in SASE free-electron-laser (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-06-22
    Description: In this paper, the harmonics suppression effect of quasi-periodic undulators (QPUs) in self-amplified spontaneous emission free-electron laser (SASE FEL) is investigated. The numerical results show that the harmonics power is reduced by using QPUs, but the fundamental radiation power also has a pronounced decrease as the saturation length gets very long. The cases of employing QPUs as parts of undulators are studied. The calculations show that if the fraction of QPUs and their offgap are appropriate in an undulator system, the harmonics radiation could be suppressed remarkably, meanwhile the fundamental saturation length does not increase too much.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 4
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    Optimization of single-step tapering amplitude and energy detuning for high-gain FELs (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-01-15
    Description: We put forward a method to optimize the single-step tapering amplitude of undulator strength and initial energy tuning of electron beam to maximize the saturation power of high gain free-electron lasers (FELs), based on the physics of longitudinal electron beam phase space. Using the FEL simulation code GENESIS, we numerically demonstrate the accuracy of the estimations for parameters corresponding to the linac coherent light source and the Tesla test facility.
    Print ISSN: 1674-1137
    Topics: Physics
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  • 5
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    Enhanced high gain harmonic generation scheme with negative dispersion (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-02-22
    Description: The enhanced high gain harmonic generation (EHGHG) scheme has been proposed and shown to be able to significantly enhance the performance of HGHG FEL. In this paper we investigate the EHGHG scheme with negative dispersion. The bunching factor at the entrance of the radiator is analyzed, which indicates that the scheme with negative dispersion can further weaken the negative effect of the dispersive strength on the energy spread correction factor. The numerical results from GENESIS (3D-code) are presented, and are in good agreement with our analysis. Then we comparatively study the effects of the initial beam energy spread and the relative phase shift on the radiation power. The results show that the EHGHG scheme with negative dispersion has a larger tolerance on the initial beam energy spread and a nearly equal wide good region of the relative phase shift compared with the case of positive dispersion.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 6
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    Physical design of a wavelength tunable fully coherent VUV source using a self-seeding free electron laser (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-05-14
    Description: In order to meet the requirements of the synchrotron radiation users, a fully coherent VUV free electron laser (FEL) has been preliminarily designed. One important goal of this design is that the radiation wavelength can be easily tuned in a broad range (70–170 nm). In the light of the users' demand and our actual conditions, the self-seeding scheme is adopted for this proposal. Firstly, we attempted to fix the electron energy and only changed the undulator gap to vary the radiation wavelength; however, our analysis implies that this is difficult because of the great difference of the power gain length and FEL efficiency at different wavelengths. Therefore, we have considered dividing the wavelength range into three subareas. In each subarea, a constant electron energy is used and the wavelength tuning is realized only by adjusting the undulator gap. The simulation results show that this scheme has an acceptable performance.
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 7
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    Performance study of the neutron-TPC (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-21
    Description: Fast neutron spectrometers will play an important role in the future of the nuclear industry and nuclear physics experiments, in tasks such as fast neutron reactor monitoring, thermo-nuclear fusion plasma diagnostics, nuclear reaction cross-section measurement, and special nuclear material detection. Recently, a new fast neutron spectrometer based on a GEM (Gas Electron Multiplier amplification)-TPC (Time Projection Chamber), named the neutron-TPC, has been under development at Tsinghua University. It is designed to have a high energy resolution, high detection efficiency, easy access to the medium material, an outstanding n/ γ suppression ratio, and a wide range of applications. This paper presents the design, test, and experimental study of the neutron-TPC. Based on the experimental results, the energy resolution (FWHM) of the neutron-TPC can reach 15.7%, 10.3% and 7.0% with detection efficiency higher than 10 −5 for 1.2 MeV, 1.81 MeV and 2.5 MeV neutrons respe...
    Print ISSN: 1674-1137
    Topics: Physics
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  • 8
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    Inwardly rotating spirals in nonuniform excitable media (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-01-25
    Description: Author(s): Xiang Gao, Xia Feng, Mei-chun Cai, Bing-wei Li, He-ping Ying, and Hong Zhang Inwardly rotating spirals (IRSs) have attracted great attention since their observation in an oscillatory reaction-diffusion system. However, IRSs have not yet been reported in planar excitable media. In the present work we investigate rotating waves in a nonuniform excitable medium, consisting of a... [Phys. Rev. E 85, 016213] Published Tue Jan 24, 2012
    Keywords: Chaos and pattern formation
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Thermodynamic properties of noninteracting quantum gases with spin-orbit coupling (2011)
    American Physical Society (APS)
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    Publication Date: 2011-08-25
    Description: Author(s): Li He and Zeng-Qiang Yu In this brief report we study thermodynamic properties of noninteracting quantum gases with isotropic spin-orbit coupling. At high temperature, coefficients of virial expansion depend on both temperature T and spin-orbit coupling strength κ . For strong coupling, virial expansion is applicable to the... [Phys. Rev. A 84, 025601] Published Wed Aug 24, 2011
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Noncontact Cohesive Swimming of Bacteria in Two-Dimensional Liquid Films (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-07-07
    Description: Author(s): Ye Li, He Zhai, Sandra Sanchez, Daniel B. Kearns, and Yilin Wu Bacterial swimming in confined two-dimensional environments is ubiquitous in nature and in clinical settings. Characterizing individual interactions between swimming bacteria in 2D confinement will help to understand diverse microbial processes, such as bacterial swarming and biofilm formation. Here… [Phys. Rev. Lett. 119, 018101] Published Wed Jul 05, 2017
    Keywords: Polymer, Soft Matter, Biological, Climate, and Interdisciplinary Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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