Statistical Analysis of Crossed Undulator for Polarization Control in a SASE FEL

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There is a growing interest in producing intense, coherent x-ray radiation with an adjustable and arbitrary polarization state. In this paper, we study the crossed undulator scheme (K.-J. Kim, Nucl. Instrum. Methods A 445, 329 (2000)) for rapid polarization control in a self-amplified spontaneous emission (SASE) free electron laser (FEL). Because a SASE source is a temporally chaotic light, we perform a statistical analysis on the state of polarization using FEL theory and simulations. We show that by adding a small phase shifter and a short (about 1.3 times the FEL power gain length), 90{sup o} rotated planar undulator after ... continued below

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14 pages

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Ding, Yuantao & Huang, Zhirong February 1, 2008.

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There is a growing interest in producing intense, coherent x-ray radiation with an adjustable and arbitrary polarization state. In this paper, we study the crossed undulator scheme (K.-J. Kim, Nucl. Instrum. Methods A 445, 329 (2000)) for rapid polarization control in a self-amplified spontaneous emission (SASE) free electron laser (FEL). Because a SASE source is a temporally chaotic light, we perform a statistical analysis on the state of polarization using FEL theory and simulations. We show that by adding a small phase shifter and a short (about 1.3 times the FEL power gain length), 90{sup o} rotated planar undulator after the main SASE planar undulator, one can obtain circularly polarized light--with over 80% polarization--near the FEL saturation.

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14 pages

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  • Journal Name: Phys. Rev. ST Accel. Beams

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  • Report No.: SLAC-PUB-13061
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevSTAB.11.030702 | External Link
  • Office of Scientific & Technical Information Report Number: 922949
  • Archival Resource Key: ark:/67531/metadc900275

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  • February 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 26, 2017, 3:44 p.m.

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Ding, Yuantao & Huang, Zhirong. Statistical Analysis of Crossed Undulator for Polarization Control in a SASE FEL, article, February 1, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc900275/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.