Numerical study of the 3-D effect on FEL performance and its application to the APS LEUTL FEL

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A Low-Energy Undulator Test Line (LEUTL) is under construction at the Advanced Photon Source (APS). In LEUTL periodic focusing is provided by external quadrupoles. This results in an elliptical beam with its betatron oscillation envelope varying along the undulators. The free-electron laser (FEL) interaction with such a beam will exhibit truly 3-D effects. Thus the investigation of 3-D effects is important in optimizing the FEL performance. The programs GINGER and TDA3D, coupled with theoretically known facts, have been used for this purpose. Both programs are fully 3-D in moving the particle, but model the interaction between particles and axially symmetric ... continued below

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2 p.

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Chae, Y.C. September 1, 1998.

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Description

A Low-Energy Undulator Test Line (LEUTL) is under construction at the Advanced Photon Source (APS). In LEUTL periodic focusing is provided by external quadrupoles. This results in an elliptical beam with its betatron oscillation envelope varying along the undulators. The free-electron laser (FEL) interaction with such a beam will exhibit truly 3-D effects. Thus the investigation of 3-D effects is important in optimizing the FEL performance. The programs GINGER and TDA3D, coupled with theoretically known facts, have been used for this purpose. Both programs are fully 3-D in moving the particle, but model the interaction between particles and axially symmetric electromagnetic waves. Even though TDA3D can include a few azimuthal modes in the interaction, it is still not a fully 3-D FEL code. However, they show that these 2-D programs can still be used for an elliptical beam whose aspect ratio is within certain limits. The author presents numerical results of FEL performance for the circular beam, the elliptical beam, and finally for the beam in the realistic LEUTL lattice.

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2 p.

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INIS; OSTI as DE98058862

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  • FEL `98: 20. international conference, Williamsburg, VA (United States), 16-21 Aug 1998

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  • Other: DE98058862
  • Report No.: ANL/ASD/CP--96443
  • Report No.: CONF-980842--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 291045
  • Archival Resource Key: ark:/67531/metadc683044

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 14, 2015, 6:41 p.m.

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Chae, Y.C. Numerical study of the 3-D effect on FEL performance and its application to the APS LEUTL FEL, article, September 1, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc683044/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.