| Paper | Title | Other Keywords | Page | ||
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| TUPSA010 | Attosecond and Femtosecond Electron Bunches Obtainable Upon Field Emission in a Combined Quasi-static and Laser Electric Field | electron, cathode, laser, radiation | 56 | ||
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Short pulses of electrons of femtosecond and attosecond duration are necessary for numerous applications: studying fast processes in physics, chemistry, biology and medicine*. It was shown that it is possible to generate electron bunches due to field emission of T/2 - T/8 duration (T is the period of laser oscillation), i.e., 400 as to 20 fs with neodymium or carbon dioxide lasers. Currents of 10 mA to 10 A can be obtained from single-spike cathode and up to 10 kA with a multi-spike cathode**. Further bunching occurs due to velocity modulation in the bunch by laser electric field resulting in 6 as for neodymium laser and 120 as for carbon dioxide laser***. Transverse focusing of such bunches is discussed. Heating of spikes for single-pulse regime is several degrees and therefore it is possible to generate a sequence of electron bunches (up to 100 – 500 pulses). They can be used in diffractometry and after acceleration to 3 – 4 MeV for generation of short pulses of VUV and soft X-ray radiation in periodic fields or as a relativistic mirror. Influence of space-charge force are studied using simple analytical solutions and methods to compensate it are proposed.
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*P. Emma. Proc. EPAC04, p. 225, Lucerne, Suisse. |
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