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Title |
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| MOPLT075 |
Ideal Waterbag Electron Bunches from an RF Photogun
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725 |
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- O.J. Luiten, M.J. Van der Wiel, S.B. van der Geer
TUE, Eindhoven
- F. Kiewiet
FOM Rijnhuizen, Nieuwegein
- M.J. de Loos
PP, Soest
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With the implementation of fs mode-locked Ti:Sapphire lasers in high-gradient RF photoguns, a new charged particle acceleration regime has emerged, the so-called pancake regime. Pancake bunches have by definition a restframe length which is much smaller than the bunch radius. This geometry allows a relatively simple, but effective analytical description of the space-charge dominated, critical initial part of the acceleration trajectory. In high-gradient RF photoguns the pancake regime can be relevant up to several MeV. The general opinion is that extremely short bunches should be avoided during the initial stages of the acceleration process, because high space charge densities are always detrimental to the final beam quality. We show that this is not necessarily true: shorter bunches may even lead to better beams.
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