Author: Yan, L.X.
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Linac Based Light Source Activities at THU  
  • Y. C. Du, L.X. Yan
    TUB, Beijing, People’s Republic of China
  The high brightness electron linac based on a photocathode RF gun was established in Tsinghua University for the study of Thomson scattering x-ray and THz radiation light sources. Recent THz radiation research activities with tunable bunch trains, specially on their generation and diagnostics, will be presented. Experiments on coherent undulator radiation, coherent transition radiation, coherent Smith-Purcell radiation, dielectric wakefield radiation were performed. Another part of this talk will be focused on the recent progress in linac based ICS source at Tsinghua University, including the experiments on X/gamma-ray generation, diagnostic, and its applications in advanced X-ray imaging. And the design of a new compact ICS gamma-ray sources will also be discussed in this talk.  
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THPO116 Space-Charge Dominated Photoemission in High Gradient Photocathode RF Guns 941
THOP11   use link to see paper's listing under its alternate paper code  
  • Y. Chen, P. Boonpornprasert, J.D. Good, M. Groß, H. Huck, I.I. Isaev, D.K. Kalantaryan, C. Koschitzki, M. Krasilnikov, O. Lishilin, G. Loisch, D. Melkumyan, R. Niemczyk, A. Oppelt, H.J. Qian, Y. Renier, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • H. Chen, Y. C. Du, W.-H. Huang, C.-X. Tang, Q.L. Tian, L.X. Yan
    TUB, Beijing, People’s Republic of China
  • H. De Gersem, E. Gjonaj
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Dohlus
    DESY, Hamburg, Germany
  • S. A. Schmid
    Institut Theorie Elektromagnetischer Felder, TU Darmstadt, Darmstadt, Germany
  The cathode emission physics plays a crucial role in the overall beam dynamics in the gun. Interplays between intricate emission mechanisms in the cathode vicinity strongly influence the cathode quantum efficiency (QE) and the intrinsic emittance. The presence of strong space-charge effects in high gradient RF guns further complicates the emission process. A proper modeling of photoemission and a careful treatment of the space-charge contribution is thus of great necessity to understanding the formation of the beam slice emittance. In this article, emission measurements are carried out using the L-band cesium-telluride photocathode RF gun at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) and the S-band copper photocathode RF gun at Tsinghua University. Following the Dowell model a simple so-called space-charge iteration approach is developed and used to determine the QE through temporal and spatial-dependent electromagnetic fields. An impact of the space-charge cooling on the thermal emittance is presented. Measurement data are shown and discussed in comparisons to preliminary simulation results.  
slides icon Slides THPO116 [6.249 MB]  
poster icon Poster THPO116 [3.157 MB]  
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About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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