Van der Wiel, M.J.
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| TUPP052 | Compact, Ultra-Bright Coherent Transition Radiation Terahertz Source | |
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Funding: Foundation for Fundamental Research on Matter (FOM), The Netherlands We are developing a compact terahertz source based on the coherent emission of transition radiation by ultra-short electron bunches (typically 100 pC in 100 fs) of moderate energy (typically 5 MeV) passing through a foil. Such electron bunches can be realized by velocity bunching of uniform ellipsoidal "waterbag" electron bunches, which can be created by photoemission with properly shaped femtosecond laser pulses [1]. Calculations indicate that a significant part of the kinetic energy of the bunch is converted into a huge coherent burst of terahertz radiation. [1] O.J. Luiten, S.B. van der Geer, M.J. de Loos, F.B. Kiewiet, and M.J. van der Wiel, Phys. Rev. Lett. 93, 094802 (2004). |
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| WEOB003 | Pancakes, Waterbags, and Cold Atoms: New Recipes for High-Brightness Electron Beams | |
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Funding: Foundation for Fundamental Research on Matter (FOM), The Netherlands Ideal "waterbag" electron bunches - uniformly filled, hard-edged ellipsoids of charge - can be realized in practice by photoemission with properly shaped fs laser pulses [1]. The linear self-fields of such objects enable thermal-emittance-limited beams and bunch compression to the kA level. The thermal emittance may be lowered to below 0.1 micron by extracting the electrons from an ultra-cold plasma, created by photo-ionization of a cloud of laser-cooled atoms. We will present GPT simulations of the application of waterbags and cold atoms in realistic settings, based on established technology. The status of experiments will be reported. [1] O.J. Luiten, S.B. van der Geer, M.J. de Loos, F.B. Kiewiet, and M.J. van der Wiel, Phys. Rev. Lett. 93, 094802 (2004). |
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