SASE FEL Saturation Characterization at the ATF
نویسنده
چکیده
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 Spontaneous Emission (SASE) FEL is part of the Linac Coherent Light Source (LCLS) X-ray FEL R&D effort to develop technologies for the proposed X-ray FEL and study the physics of SASE FEL’s. The VISA experiment was designed and operated by a BNL/LLNL/SLAC/UCLA collaboration. The VISA experiment employed a 4-meter long undulator [3] (fig.1) with built-in strong focusing. The undulator has a period of 1.8 cm, with an undulator parameter K=1.26. The VISA undulator has a 6 mm gap, which is the same as the proposed LCLS X-ray FEL undulator. The high-brightness electron beam
منابع مشابه
Saturation 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 کاملMeasuring Fel Radiation Properties at Visa-fel
The VISA (Visible to Infrared SASE Amplifier) SASE free electron laser has been successfully operated at the Accelerator Test Facility (ATF) at BNL. High gain and saturation were observed at 840 nm. We describe here the diagnostic system, experimental procedures and data reduction algorithms, as the FEL performance was measured along the length of the undulator. We also discuss selected spectra...
متن کاملChirped pulse amplification at VISA-FEL
Chirped beam manipulations are of the great interest to the FEL (Free Electron Laser) community as potential means of obtaining ultra short X-ray pulses. The experiment is under way at the ATF (Accelerator Test Facility) at BNL (Brookhaven National Laboratory) to study the FEL process limits with the under-compressed chirped electron beam. High gain near-saturation SASE operation was achieved w...
متن کاملExperimental characterization of nonlinear harmonic radiation from a visible SASE FEL at saturation
Nonlinear harmonic radiation was observed using the VISA SASE FEL at saturation. The gain lengths, spectra and energies of the three lowest SASE FEL modes were experimentally characterized. Both the measured harmonic gain lengths and center spectral wavelengths are shown to decrease with harmonic number, n, which is consistent with nonlinear harmonic theory. The measured energies for both secon...
متن کاملMeasurements of nonlinear harmonic radiation and harmonic microbunching in a visible SASE FEL
The experimental characterization of nonlinear harmonic generation (NHG) and electron beam microbunching at saturation from a visible SASE FEL are presented in this report. The gain lengths, spectra and energies of NHG were experimentally measured up to the third harmonic, and agree with theoretical predictions. Electron beam microbunching in both the fundamental and the second harmonic as the ...
متن کامل