Theoretical study of the design and performance of a high-gain, high-extraction-efficiency FEL oscillator

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We present the results of theoretical and simulation studies of the design and performance of a new F type of FEL oscillator. This device, known by the acronym RAFEL for Regenerative Amplifier Free-Electron Laser, will be constructed in the space presently occupied by the AFEL (Advanced FEL) at Los Alamos, and will be driven by an upgraded (to higher average power) version of the present AFEL linac. In order to achieve a long-time-averaged optical output power of {approximately} 1 kW using an electron beam with an average power of {approximately} 20 kW, a rather high extraction efficiency {eta} {approximately} 5% ... continued below

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33 p.

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Goldstein, J.; Nguyen, D.C. & Sheffield, R.L. October 1, 1996.

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Description

We present the results of theoretical and simulation studies of the design and performance of a new F type of FEL oscillator. This device, known by the acronym RAFEL for Regenerative Amplifier Free-Electron Laser, will be constructed in the space presently occupied by the AFEL (Advanced FEL) at Los Alamos, and will be driven by an upgraded (to higher average power) version of the present AFEL linac. In order to achieve a long-time-averaged optical output power of {approximately} 1 kW using an electron beam with an average power of {approximately} 20 kW, a rather high extraction efficiency {eta} {approximately} 5% is required. We have designed a 2-m-long undulator to attain this goal: the first meter is untapered and provides high gain while the second meter is linearly-tapered in magnetic field amplitude to provide high extraction efficiency in the standard K-M-R manner. Two-plane focusing and linear polarization of the undulator are assumed. Electron-beam properties from PARMEIA simulations of the AFEL accelerator were used in the design. A large saturated gain, {approximately} 500, requires a very small optical feedback to keep the device operating at steady-state. However, the large gain leads to distorted optical modes which require two- and three-dimensional simulations to adequately treat diffraction effects. This FEL will be driven by 17 MeV electrons and will operate in the 16 {mu}m spectral region.

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33 p.

Notes

OSTI as DE96014827

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  • 18. international free electron laser conference and 3. FEL Users` workshop, Rome (Italy), 25-30 Aug 1996

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  • Other: DE96014827
  • Report No.: LA-UR--96-2902
  • Report No.: CONF-9608133--2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 376375
  • Archival Resource Key: ark:/67531/metadc675665

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Office of Scientific & Technical Information Technical Reports

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  • October 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • June 24, 2016, 1:55 p.m.

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Goldstein, J.; Nguyen, D.C. & Sheffield, R.L. Theoretical study of the design and performance of a high-gain, high-extraction-efficiency FEL oscillator, article, October 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc675665/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.