نتایج جستجو برای: fel
تعداد نتایج: 2243 فیلتر نتایج به سال:
We developed higher-harmonic free-electron laser (FEL) oscillations with the storage ring NIJI-IV from the visible to near-infrared region. Using another “higher order”, that is, higher-diffraction order of the target wavelength of dielectric multilayer mirrors, we realized a lasing on the highest order in the harmonic FELs. Moreover, the FEL wavelength was shortened to the visible region in th...
FEL experiments in the NIR region were carried out with a compact storage ring NIJI-IV at the National Institute of Advanced Industrial Science and Technology. Spontaneous emission spectra from the optical klystron ETLOK-III were measured at wavelengths around 850 nm. High-reflectance cavity mirrors were set in mirror chambers this August. The cavity loss was measured to be about 0.2%, and the ...
Due to the lack of coherent seed at the x-ray wavelengths, a SASE FEL is the most straightforward method to build an x-ray FEL. However, the temporal coherence of a SASE FEL is limited because the process starts from electron shot noise. To overcome this limitation, an ultraviolet seed laser may be used to interact with the electron beam in order to create density modulations at higher harmonic...
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FERMI@Elettra is a free electron-laser (FEL)-based user facility that, after two years of commissioning, started preliminary users’ dedicated runs in 2011. At variance with other FEL user facilities, FERMI@Elettra has been designed to deliver improved spectral stability and longitudinal coherence. The adopted scheme, which uses an external laser to initiate the FEL process, has been demonstrate...
An important element in the concept of coherent electron cooling [1] is amplification of the electric field induced by a point charge in an electron beam passing through an FEL amplifier. We calculate this factor in 1D FEL theory and show that it is equal to the conventional FEL gain (for the field) multiplied by the relative bandwidth of the FEL amplifier, which is typically a small parameter ...
The feedback system has been developed in KU-FEL linac to stabilize the FEL power fluctuation. The system consists of six 4-button type BPMs and the signal processing system. As the first step, the beam displacement information at the RF-gun section was used for the feedback control to stabilize the electron energy and the vertical beam position at the RF-gun section. As the result the FEL powe...
Studies of a broad bandwidth, two-colour free electron laser (FEL) amplifier using one monoenergetic electron beam are presented. The two-colour FEL interaction is achieved using a series of undulator modules alternately tuned to two well-separated resonant frequencies. Using the broad bandwidth FEL simulation code Puffin, the electron beam is shown to bunch strongly and simultaneously at the t...
The JAERI superconducting rf linac has been developed to produce a high-power infrared free-electron laser (FEL). So far, a stable kW-level laser output has been achieved with improvements of the electron gun, the optical resonator as well as the beam transport optics. For increasing FEL power, energy-recovery experiments are planned in the next phase of the FEL development. The lattice design ...
VISA (Visible to Infrared SASE Amplifier) is an FEL designed to obtain high gain at a radiation wavelength of 800 nm. Large gain is achieved by driving the FEL with the 71 MeV, high brightness beam of the Accelerator Test Facility (ATF) and using a novel, strong focusing, 4 m long undulator with a gap of 6 mm and a period of 1.8 cm. We report measurements of exponential gain, saturation, and sp...
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