Three-dimensional analysis of free-electron laser performance using brightness scaled variables

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A three-dimensional analysis of radiation generation in a free-electron laser (FEL) is performed in the small signal regime. The analysis includes beam conditioning, harmonic generation, flat beams, and a new scaling of the FEL equations using the six-dimensional beam brightness. The six-dimensional beam brightness is an invariant under Liouvillian flow; therefore, any nondissipative manipulation of the phase-space, performed, for example, in order to optimize FEL performance, must conserve this brightness. This scaling is more natural than the commonly-used scaling with the one-dimensional growth rate. The brightness-scaled equations allow for the succinct characterization of the optimal FEL performance under various additional ... continued below

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Penn, Gregory; Gullans, M.; Penn, G.; Wurtele, J.S. & Zolotorev, M. June 11, 2008.

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A three-dimensional analysis of radiation generation in a free-electron laser (FEL) is performed in the small signal regime. The analysis includes beam conditioning, harmonic generation, flat beams, and a new scaling of the FEL equations using the six-dimensional beam brightness. The six-dimensional beam brightness is an invariant under Liouvillian flow; therefore, any nondissipative manipulation of the phase-space, performed, for example, in order to optimize FEL performance, must conserve this brightness. This scaling is more natural than the commonly-used scaling with the one-dimensional growth rate. The brightness-scaled equations allow for the succinct characterization of the optimal FEL performance under various additional constraints. The analysis allows for the simple evaluation of gain enhancement schemes based on beam phase space manipulations such as emittance exchange and conditioning. An example comparing the gain in the first and third harmonics of round or flat and conditioned or unconditioned beams is presented.

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11

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  • Journal Name: Physical Review of Special Topics, Accelerators and Beams, Phys. Rev. ST Accel. Beams 11, 060701; Journal Volume: 11; Journal Issue: 6; Related Information: Journal Publication Date: June, 2008

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  • Report No.: LBNL-705E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 935354
  • Archival Resource Key: ark:/67531/metadc895498

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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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  • June 11, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 31, 2016, 11:51 a.m.

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Penn, Gregory; Gullans, M.; Penn, G.; Wurtele, J.S. & Zolotorev, M. Three-dimensional analysis of free-electron laser performance using brightness scaled variables, article, June 11, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc895498/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.