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Title: Control of the polarization of a vacuum-ultraviolet, high-gain, free-electron laser

The two single-pass, externally seeded free-electron lasers (FELs) of the FERMI user facility are designed around Apple-II-type undulators that can operate at arbitrary polarization in the vacuum ultraviolet-to-soft x-ray spectral range. Furthermore, within each FEL tuning range, any output wavelength and polarization can be set in less than a minute of routine operations. We report the first demonstration of the full output polarization capabilities of FERMI FEL-1 in a campaign of experiments where the wavelength and nominal polarization are set to a series of representative values, and the polarization of the emitted intense pulses is thoroughly characterized by three independent instruments and methods, expressly developed for the task. The measured radiation polarization is consistently >90% and is not significantly spoiled by the transport optics; differing, relative transport losses for horizontal and vertical polarization become more prominent at longer wavelengths and lead to a non-negligible ellipticity for an originally circularly polarized state. The results from the different polarimeter setups validate each other, allow a cross-calibration of the instruments, and constitute a benchmark for user experiments.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [7] ;  [8] ;  [9] ;  [1] ;  [10] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] more »;  [11] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] ;  [7] ;  [3] ;  [3] ;  [3] ;  [7] ;  [7] ;  [7] ;  [7] ;  [16] ;  [17] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [18] ;  [2] ;  [19] « less
  1. Elettra-Sincrotrone Trieste (Italy)
  2. ENSTA ParisTech-CNRS (France)
  3. DESY, Hamburg (Germany)
  4. Elettra-Sincrotrone Trieste (Italy); CNR Istituto Officina dei Materiali, Trieste (Italy)
  5. Elettra-Sincrotrone Trieste (Italy); Univ. of Nova Gorcia (Slovenia)
  6. Elettra-Sincrotrone Trieste (Italy); Universita degli Studi di Trieste (Italy)
  7. European XFEL, Hamburg (Germany)
  8. European XFEL, Hamburg (Germany); STanford, PULSE Inst., Menlo Park, CA (United States)
  9. Sorbonne Universities and CNRS, Paris (France)
  10. Elettra-Sincrotrone Trieste (Italy); Univ. of Trieste (Italy)
  11. Elettra-Sincrotrone Trieste (Italy); Univ. of Nova Gorica (Slovenia)
  12. Elettra-Sincrotrone Trieste (Italy); Univ. of Nova Gorica (Slovenia); CNR Instituto Officina dei Materiali, Trieste (Italy)
  13. Elettra-Sincrotrone Trieste (Italy); CNR-ISM (Italy)
  14. Univ. of Nova Gorica (Slovenia)
  15. CNR Instituto Officina dei Materiali, Trieste (Italy)
  16. Universitat Kassel (Germany)
  17. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  18. Sorbonne Universites and CNRS, Paris (France)
  19. Elettra-Sincrotrone Trieste (Italy); ENEA (Italy)
Publication Date:
OSTI Identifier:
1215438
Grant/Contract Number:
Q1-0015; 2013/2010090600115298; FIRB-RBAP045JF2; FIRB-RBAP06AWK3
Type:
Accepted Manuscript
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING interdisciplinary physics; particles and fields; photonics