An integral equation based computer code for high-gain free-electron lasers

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Description

A computer code for gain optimization of high-gain free-electron lasers (FELs) is described. The electron motion is along precalculated period-averaged trajectories, and the finite-emittance electron beam is represented by a set of thin partial beams. The radiation field amplitudes are calculated at these thin beams only. The system of linear integral equations for these field amplitudes and the Fourier harmonics of the current of each thin beam is solved numerically. The code is aimed for design optimization of high-gain short-wavelength FELs with nonideal magnetic systems (breaks between undulators with quadrupoles and magnetic bunchers; field and steering errors). Both self-amplified spontaneous ... continued below

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7 p.

Creation Information

Dejus, R.J.; Shevchenko, O.A. & Vinokurov, N.A. September 1, 1998.

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Description

A computer code for gain optimization of high-gain free-electron lasers (FELs) is described. The electron motion is along precalculated period-averaged trajectories, and the finite-emittance electron beam is represented by a set of thin partial beams. The radiation field amplitudes are calculated at these thin beams only. The system of linear integral equations for these field amplitudes and the Fourier harmonics of the current of each thin beam is solved numerically. The code is aimed for design optimization of high-gain short-wavelength FELs with nonideal magnetic systems (breaks between undulators with quadrupoles and magnetic bunchers; field and steering errors). Both self-amplified spontaneous emission (SASE) and external input signal options can be treated. A typical run for a UV FEL, several gain lengths long, takes only one minute on a Pentium II personal computer (333 MHz) which makes it possible to run the code in optimization loops. Results for the Advanced Photon Source FEL project are presented.

Physical Description

7 p.

Notes

OSTI as DE98058308

Source

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

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  • Other: DE98058308
  • Report No.: ANL/XFD/CP--96333
  • Report No.: CONF-980842--
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 291061
  • Archival Resource Key: ark:/67531/metadc684229

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  • September 1, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Dec. 14, 2015, 6:43 p.m.

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Dejus, R.J.; Shevchenko, O.A. & Vinokurov, N.A. An integral equation based computer code for high-gain free-electron lasers, article, September 1, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc684229/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.