نتایج جستجو برای: undulator radiation
تعداد نتایج: 238859 فیلتر نتایج به سال:
A Fixed Angle Double Mirror Filter for Preparing a Pink Undulator Beam at the Advanced Photon Source
Recent advances in X-ray Photon Correlation Spectroscopy (XPCS) use the full bandwidth of an undulator harmonic in order to maximize the coherent flux for small angle X-ray scattering experiments. X-ray mirrors and filters are typically used to select a given harmonic of the spectrum. At the University of Michigan/Howard University/Lucent Technologies, Bell Labs, Collaborative Access Team (MHAT...
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...
We propose a simple method to significantly enhance the temporal coherence and spectral brightness of a self-amplified spontaneous emission (SASE) free-electron laser (FEL). In this purified SASE (pSASE) FEL, a few undulator sections (called slippage-boosted section) resonant at a subharmonic of the FEL radiation are used in the middle stage of the exponential growth regime to amplify the radia...
A generalized formulation of spontaneous emission and super-radiance effects in a free-electron laser is presented. We consider a stream of electrons of arbitrary temporal duration propagating through the undulator. The sum of the undulator synchrotron radiation emitted by individual wiggling electrons entering the wiggler at random, results in shot-noise in the radiation field. Using the waveg...
In SASE FELs, the radiation power has to saturate in a single pass through the undulator. In the VUV and X-ray regime, with undulators ranging in length from several tens to hunderds of meters, even a few percent increase in gain length could mean a lengthening of the undulator by several meters. Therefore, determining what increases the gain length is of great importance. The influence of the ...
A compact and comparatively inexpensive system that is practical for universities is described based on a low-energy, electron storage ring with at least one undulator based oscillator to store photons. If the oscillator cavity length is relativistically corrected to be an harmonic of the ring circumference (LC=βLRn=nB with nB the number of bunches), higher-energy, secondary photons from Compto...
Abstract Attosecond duration relativistic electron bunches travelling through an undulator can generate brilliant coherent radiation in the visible to vacuum ultraviolet spectral range. We present comprehensive numerical simulations study properties of emission for a wide range energies and bunch durations, including space-charge effects. These demonstrate that with r.m.s. 50 as, nominal charge...
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