Photoelectron spectroscopy as a non-invasive method to monitor SASE-FEL spectra
نویسندگان
چکیده
منابع مشابه
Frequency Chirped SASE FEL
We present a statistical analysis of the temporal and spectral properties of SASE radiation from an energy-chirped electron beam passing through a long undulator. It is found that the coherence time is independent of the chirp, while the range of spectral coherence is linearly proportional to it. We consider the use of a monochromator to pick out a small temporal slice of the radiation output. ...
متن کاملRadiation Pulse Compression for a SASE-FEL
The total radiation pulse consists of NS spikes, and the total pulse length is LP=NSLc. In a normal configuration all the spikes have the same line-width and the same central frequency. Chirping the pulse, i.e. changing the frequency of each spike by a quantity proportional to the spike longitudinal position inside the pulse, allow us to compress the pulse using a pair of diffraction gratings. ...
متن کاملSaturation Measurements of a Visible Sase Fel*
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...
متن کاملOptimization of an X-ray SASE-FEL
The most important characteristics of an X-ray SASE-FEL are determined by the electron beam energy, transverse and longitudinal emittance, and by choice of the undulator period, field, and gap. Among them are the gain and saturation length, the amount and spectral characteristics of the spontaneous radiation, the wake fields due to the vacuum pipe. The spontaneous radiation intensity is very la...
متن کاملSASE FEL Saturation Characterization at the ATF
After successful completion of the High Gain Harmonic Generation (HGHG) free electron laser (FEL) experiment [1,2] at the Accelerator Test Facility (ATF), R&D toward future light sources at the NSLS achieved another milestone on March 17, 2001 when the visible-infrared self-amplified spontaneous emission amplifier (VISA) experiment at the ATF achieved saturation. The VISA Self Amplified Spontan...
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ژورنال
عنوان ژورنال: Journal of Instrumentation
سال: 2008
ISSN: 1748-0221
DOI: 10.1088/1748-0221/3/02/p02003