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Title |
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TUPO098 |
Proof-of-Principle Tests for Slit-scan-based Slice Emittance Measurements at PITZ |
553 |
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- R. Niemczyk, P. Boonpornprasert, Y. Chen, J.D. Good, M. Groß, H. Huck, I.I. Isaev, D.K. Kalantaryan, C. Koschitzki, M. Krasilnikov, X. Li, O. Lishilin, G. Loisch, D. Melkumyan, A. Oppelt, H.J. Qian, Y. Renier, C. Saisa-ard, F. Stephan, Q.T. Zhao
DESY Zeuthen, Zeuthen, Germany
- W. Hillert
University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
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Transverse slice emittance is one of the most important properties of high-brightness electron beams for freeelectron lasers (FELs). The photo injector test facility at DESY in Zeuthen (PITZ) develops high-brightness electron sources for modern FELs. With a 23 MeV, 1 nC beam at PITZ the experimental slice emittance characterization with the quadrupole scan technique is complicated by strong space charge effects. Combining the slit scan technique with a transverse deflecting cavity (TDS) allows for timeresolved emittance measurements of such a space-chargedominated beam. The first proof-of-principle results of slice emittance measurements at PITZ based on the ’TDS + slit scan’-technique are presented in this paper.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO098
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About • |
paper received ※ 04 September 2018 paper accepted ※ 19 September 2018 issue date ※ 18 January 2019 |
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THPO116 |
Space-Charge Dominated Photoemission in High Gradient Photocathode RF Guns |
941 |
THOP11 |
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- 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
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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.
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Slides THPO116 [6.249 MB]
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Poster THPO116 [3.157 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-LINAC2018-THPO116
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|
About • |
paper received ※ 11 September 2018 paper accepted ※ 21 September 2018 issue date ※ 18 January 2019 |
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Export • |
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