Experimental Study of the Effect of Electron Beam Quality on Free-Electron Laser Gain
Abstract
The objective was the measurement of the single pass FEL known as the High-Gain, Harmonic Generation FEL. The HGHG approach utilizes a laser-seeded FEL to produce amplified, longitudinally coherent, Fourier-transform- limited output at a harmonic of the seed laser. In the experiment performed at the Accelerator Test Facility at Brookhaven National Laboratory, a seed CO2 laser at a wavelength of 1O.6mm produced saturated, amplified FEL output at the second-harmonic wavelength, 5.3mm. The HGHG FEL was demonstrated successfully. The duration of the output pulse was measured using a second-harmonic intensity autocorrelator, and the coherence length was measured using an interferometer. We also measured the energy distribution of the electron beam after ft exited the second undulatory, observing behavior consistent with that is expected at saturation. The intensity of the harmonic components of the output at 2.65 mm and 1.77 mm were determined relative to that of the 5.3-mm fundamental. Finally, using a corrector magnet upstream of the radiator, steering effects on the trajectories of the electron and light beams were studied.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 03, 2001
- Accession Number
- ADA390334
Entities
People
- Ilan Ben-zvi
Organizations
- Stony Brook University