A pure permanent magnet-two plane focusing-tapered wiggler for a high average power FEL

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A high-average power FEL is under construction at Los Alamos. The FEL will have aspects of both an oscillator and a SASE (self-amplified spontaneous emission) device. That is, a high-gain and high- extraction efficiency wiggler will be used with a very low-Q optical resonator. FEL simulations reveal that a tapered wiggler with two- plane focusing is required to obtain desired performance. The wiggler is comprised of a I meter long untapered section followed by a 1 meter tapered section. The taper is achieved with the magnetic gap and not the wiggler period which is constant at 2 cm. The gap ... continued below

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11 p.

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Fortgang, C.M. November 1, 1996.

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Description

A high-average power FEL is under construction at Los Alamos. The FEL will have aspects of both an oscillator and a SASE (self-amplified spontaneous emission) device. That is, a high-gain and high- extraction efficiency wiggler will be used with a very low-Q optical resonator. FEL simulations reveal that a tapered wiggler with two- plane focusing is required to obtain desired performance. The wiggler is comprised of a I meter long untapered section followed by a 1 meter tapered section. The taper is achieved with the magnetic gap and not the wiggler period which is constant at 2 cm. The gap is tapered from 5.9 mm to 8.8 mm. The, gap, rather than the period, is tapered to avoid vignetting of the 16 {mu}m optical beam. Two-plane focusing is necessary to maintain high current density and thus high gain through out the 2 meter long wiggler. Several magnetic designs have been considered for the wiggler. The leading candidate approach is a pure permanent wiggler with pole faces that are cut to roughly approximate the classical parabolic pole face design. Focusing is provided by the sextupole component of the wiggler magnetic field and is often called ``natural`` or ``betatron`` focusing. Details of the design will be presented.

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11 p.

Notes

OSTI as DE97000382

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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: DE97000382
  • Report No.: LA-UR--96-3343
  • Report No.: CONF-9608133--6
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 399362
  • Archival Resource Key: ark:/67531/metadc678687

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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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  • November 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • March 1, 2016, 1:24 p.m.

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Fortgang, C.M. A pure permanent magnet-two plane focusing-tapered wiggler for a high average power FEL, article, November 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc678687/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.