High-quality electron bunch production for high-brilliance Thomson Scattering sources

Year: 2017

Authors: Tomassini P., Labate L., Londrillo P., Fedele R., Terzani D., Gizzi L.A.

Autors Affiliation: Intense Laser Irradiation Laboratory, INO-CNR, Pisa, Italy; Dip. Fisica, Universita\’ di Napoli Federico II, Italy; INFN, Pisa, Italy; INAF Bologna, Italy

Abstract: Laser Wake Field accelerated electrons need to exhibit a good beam-quality to comply with requirements of FEL or high brilliance Thomson Scattering sources, or to be post-accelerated in a further LWFA stage towards TeV energy scale. Controlling electron injection, plasma density profile and laser pulse evolution are therefore crucial tasks for high-quality e-bunch production. A new bunch injection scheme, the Resonant Multi-Pulse Ionization Injection (RMPII), is based on a single, ultrashort Ti:Sa laser system. In the RMPII the main portion of the pulse is temporally shaped as a sequence of resonant sub-pulses, while a minor portion acts as an ionizing pulse. Simulations show that high-quality electron bunches with energies in the range 265MeV -1.15GeV, normalized emittance as low as 0.08 mm·mrad and 0.65% energy spread can be obtained with a single 250 TW Ti:Sa laser system. Applications of the e-beam in high-brilliance Thomson Scattering source, including 1.5 – 26.4 MeV gamma sources with peak brilliance up to 1.10(28)ph/(s.mm(2) . mrad(2) . 0.1% bw), are reported.

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More Information: Authors wish to thank Vittoria Petrillo and Luca Serafini for their unvaluable discussions about FEL and Thomson Scattering. The research leading to these results has received funding from the European Union\’s Horizon 2020 research and innovation programme under Grant Agreement No 653782 – EuPRAXIA.