Surface Roughness Impedance
نویسنده
چکیده
The next generation of linac-based free electron lasers will use very short bunches with a large peak current. For such beams, the impedance caused by submicron imperfections in the vacuum beam tube may generate an additional energy spread within the bunch. A review of two mechanisms of the roughness impedance is given with the emphasis on the importance of the high-aspect ratio property of the real surface roughness. Presented at ICFA Beam Dynamics Workshop on Physics of and Science with X-Ray Free Electron Laser, 11-15 Sep. 2000, Arcidosso, Italy Work supported by Department of Energy contract DE{AC03{76SF00515. Surface Roughness Impedance
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