| Autor: |
P.P. Crooker, A. Christodoulou, William B. Colson, D. Lampiris, K. Polykandriotis, Joseph Gubeli, S.V. Benson, George R. Neil |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
Physical review. E, Statistical, nonlinear, and soft matter physics. 66(5 Pt 2) |
| ISSN: |
1539-3755 |
| Popis: |
We present experiments and simulations showing the behavior of a free-electron laser (FEL) with both positive and negative linear tapers along the wiggler. We show the power desynchronism curve widths, efficiency, exhaust electron energy spread, and wavelength dependence as a function of taper for 3- and 6-microm optical wavelengths and for resonators with 10% and 2% loss/pass. Simulations of the experiments, using a multimode analysis, are seen to be in general agreement with the experimental results, carried out at the IR Demo FEL at Thomas Jefferson National Accelerator Facility. We find that short-pulse effects are more effective than tapers in producing high efficiency with low exhaust energy spread, and the expected performance enhancement of FEL tapering is not achieved. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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