Spampinati, S, Allaria, E, Badano, L, Bassanese, S, Biedron, S, Castronovo, D, Craievich, P, Danailov, MB, Demidovich, A, De Ninno, G et al (show 15 more authors)
(2014)
Laser heater commissioning at an externally seeded free-electron laser.
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS, 17 (12).
120705-.
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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.
| Item Type: | Article |
|---|---|
| Depositing User: | Symplectic Admin |
| Date Deposited: | 18 Feb 2015 15:33 |
| Last Modified: | 16 Mar 2024 06:03 |
| DOI: | 10.1103/PhysRevSTAB.17.120705 |
| Publisher's Statement : | This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
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| URI: | https://livrepository.liverpool.ac.uk/id/eprint/2007003 |
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