Advanced beam manipulation with plasma based devices.

Pompili R., Anania M.P., Bellaveglia M., Biagioni A., Bisesto F., Chiadroni E., Ferrario M., Filippi F., Marocchino A., Shpakov V., Villa F., Zigler A.

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VI - Fisica applicata, acceleratori e beni culturali
Aula 29C-2 - Mercoledì 19 h 09:00 - 13:00
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Nowadays, there is a growing interest in the development of new compact devices able to accelerate, focus and deflect charged particle beams with large energies. Electrical breakdown limits the maximum achievable field gradients in conventional accelerators, while the focusing and bending on particle beams rely on the use of permanent magnets and super-conducting technology that due to the cost and reduced tunability do not allow to envision the realization of compact structures more affordable in terms of costs. In this context, plasma technology represents an alternative approach. Plasmas can sustain extremely large fields and currents and, for these reasons, they are replacing conventional accelerators and standard focusing devices. Recently, several proofs of principle experiments have been performed in focusing electron beams by means of the so-called active plasma lenses. Here, we present the experimental results obtained by focusing a high-brightness electron beam by means of a 3 cm-long discharge-capillary pre-filled with Hydrogen gas. We achieved minimum spot sizes of 18 um (rms) showing that, during plasma lensing, the beam emittance can strongly increase due to nonlinearities in the focusing field. The results have been cross-checked with numerical simulations, showing an excellent agreement.

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