Abstract
SPARC (acronym of ‘‘Sorgente Pulsata ed Amplificata di Radiazione Coerente’’, i.e. Pulsed and Amplified Source of Coherent Radiation) is a single pass free-electron laser designed to obtain high gain amplification at a radiation wavelength of 500 nm. Self-amplified spontaneous emission has been observed driving the amplifier with the high-brightness beam of the SPARC linac. We report measurements of energy, spectra, and exponential gain. Experimental results are compared with simulations from several numerical codes.
Highlights
Recent progress in accelerator technology has led to wide-range tunable laser radiation in the vacuumultraviolet and x-ray spectral regions by means of the development of free-electron lasers (FEL) based on the principle of self-amplified spontaneous emission (SASE) [1,2,3,4,5]
In this paper we report on SPARC lasing performance obtained so far in SASE mode
Commissioning of the SPARC FEL began in autumn 2008 with the following main goals: (1) transport the beam through the vacuum chamber up to the beam dump consistently with the matching condition in the undulator; (2) characterization of the spontaneous and stimulated radiation; and (3) demonstration of ‘‘velocity bunching’’ techniques [15,16] according to the invariant envelope condition [17]
Summary
Recent progress in accelerator technology has led to wide-range tunable laser radiation in the vacuumultraviolet and x-ray spectral regions by means of the development of free-electron lasers (FEL) based on the principle of self-amplified spontaneous emission (SASE) [1,2,3,4,5]. Commissioning of the SPARC FEL began in autumn 2008 with the following main goals: (1) transport the beam through the vacuum chamber up to the beam dump consistently with the matching condition in the undulator; (2) characterization of the spontaneous and stimulated radiation; and (3) demonstration of ‘‘velocity bunching’’ techniques [15,16] according to the invariant envelope condition [17]. These steps were completed during winter 2009, and the first SASE FEL spectra were obtained in February of the same year. A few months later, a substantial increase of the brilliance of the radiation extracted from the FEL source was obtained with a longitudinally flattop e-beam current, by increasing the bunch
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