Laser heater commissioning at an externally seeded free-electron laser

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Laser heater commissioning at an externally seeded free-electron laser

S. Spampinati, E. Allaria, L. Badano, S. Bassanese, S. Biedron, D. Castronovo, P. Craievich, M. B. Danailov, A. Demidovich, G. De Ninno, S. Di Mitri, B. Diviacco, M. Dal Forno, E. Ferrari, W. M. Fawley, L. Fröhlich, G. Gaio, L. Giannessi, G. Penco, C. Serpico, C. Spezzani, M. Trovò, M. Veronese, S. V. Milton, and M. Svandrlik

Phys. Rev. ST Accel. Beams 17, 120705 – Published 18 December 2014

Abstract

FERMI is the first user facility based upon an externally seeded free-electron laser (FEL) and was designed to deliver high quality, transversely and longitudinally coherent radiation pulses in the extreme ultraviolet and soft x-ray spectral regimes. The FERMI linear accelerator includes a laser heater to control the longitudinal microbunching instability, which otherwise is expected to degrade the quality of the high brightness electron beam sufficiently to reduce the FEL output intensity and spectral brightness. In this paper, we present the results of the FERMI laser heater commissioning. For the first time, we show that optimizing the electron beam heating at an upstream location (beam energy, 100 MeV) leads to a reduction of the incoherent energy spread at the linac exit (beam energy, 1.2 GeV). We also discuss some of the positive effects of such heating upon the emission of coherent optical transition radiation and the FEL output intensity.

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Received 27 September 2014

DOI:https://doi.org/10.1103/PhysRevSTAB.17.120705

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Published by the American Physical Society

Authors & Affiliations

S. Spampinati^1,2,*, E. Allaria¹, L. Badano¹, S. Bassanese¹, S. Biedron^1,∥, D. Castronovo¹, P. Craievich^1,†, M. B. Danailov¹, A. Demidovich¹, G. De Ninno^1,2, S. Di Mitri¹, B. Diviacco¹, M. Dal Forno^1,3,‡, E. Ferrari^1,3, W. M. Fawley¹, L. Fröhlich^1,§, G. Gaio¹, L. Giannessi^1,4, G. Penco¹, C. Serpico¹, C. Spezzani^1,¶, M. Trovò¹, M. Veronese¹, S. V. Milton^1,∥, and M. Svandrlik¹

¹Elettra Sincrotrone Trieste, 34149 Basovizza (TS), Italy
²Laboratory of Quantum Optics, Nova Gorica University, Vipavska 13, Rožna Dolina, SI-5000 Nova Gorica, Slovenia
³University of Trieste, 34128 Trieste, Italy
⁴Theory Group–ENEA C.R. Frascati, 00044 Frascati (Rome), Italy

^*Corresponding author. simone.spampinati@cockcroft.ac.uk Present address: University of Liverpool, Department of Physics, Liverpool, UK, and Cockroft Institute, Sci-Tech Daresbury, Warrington, UK.
^†Present address: Paul Scherrer Institute, 5232 Villigen-PSI AG, Switzerland.
^‡Present address: SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
^§Present address: Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg, Germany.
^¶Present address: Laboratoiré de Physique des Solides, UMR8502, Univerité Paris sud 11, Orsay, France.
^∥Present address: Colorado State University, Fort Collins, Colorado, USA.

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Vol. 17, Iss. 12 — December 2014

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