Abstract
We describe a technique by which an energy modulation of electrons via interaction with a laser pulse in a wiggler magnet is used for a significant increase of the electron peak current prior to entering a long self-amplified spontaneous emission (SASE) free electron laser undulator. This results in a reduction of the gain length for the SASE process and a modification of the structure of the output x-ray radiation. It also temporally links the output x-ray pulse to the initial laser pulse, thus providing an opportunity for accurate synchronization between the laser pump pulse and x-ray probe pulse for pump-probe experiments.
Highlights
The technique of self-amplified spontaneous emission (SASE) is a widely acknowledged tool for production of an intense flux of photons with several keV photon energies
In this paper we propose a significant enhancement of the electron peak current entering the SASE free electron laser (FEL) by using a conventional optical laser and demonstrate that this enhancement leads to a considerable reduction of the FEL gain length
The timing and duration of the x-ray pulse is controlled by the timing and duration of the optical laser pulse, which makes pumpprobe experiments available to the SASE FEL with potential for absolute temporal synchronization
Summary
The technique of self-amplified spontaneous emission (SASE) (see [1] and references therein) is a widely acknowledged tool for production of an intense flux of photons with several keV photon energies. Electrons enter a long undulator with period u and undulator parameter Kx eBxu= 2mc, where Bx is the peak magnetic field, matched to produce radiation at the x-ray wavelength x u 1 Kx2=2=2 2x via the standard SASE process.
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