Journal Article Quasi-Mono-Energetic Electron Beams from a Laser–Driven Argon Clustered Gas Target for Radiation Medicine

Tao, Mengze  ,  ホァン, カイ  ,  Li , Dazhang  ,  Li, Yifei  ,  Guo, Xin  ,  Ma, Yong  ,  Zhao, Jiarui  ,  Li, Minghua  ,  Wang, Jinguang  ,  Hafz, Nasr  ,  Zhang, Jie  ,  Chen, Liming

Purpose: To propose a promising alternative for conventional accelerators forhigh energy electron radiation therapy by generating quasi-mono-energeticelectron beams.Methods: Electron beams with energy up to hundred MeV, 1.8% energy spread,125 pC charges and a few mrad divergences have been achieved from a 3-mmlongclustered gas plasma, driven by laser pulse with peak power up to 100 TW.Optimization of experimental parameters, such as laser contrast and laser-plasmainteraction timing leads to stable laser propagation and high-quality electronbeams.Results: Clustered gas, in addition to the self-focusing effect, owns two importantfeatures: local solid electron density and efficient absorption of ultra-short laserpulses. Therefore, high ionization levels and high electron densities could generatehigh-charge energetic electron beams. Our experiment has verified that clustersin the gas jet influence the laser propagation and Wakefield evolution, producingstable laser guiding and good quality electron beams.Conclusion: The results demonstrated that the laser-driven clustered gas targetprovides a unique method for electron injection and has great potential ingenerating mono-energetic collimated electron beams with large beam charge.Stable and reproducible mono-energetic electron beams with sufficient electronintensities are required in medical applications, e.g., radiotherapy. Manyengineering issues remain to be solved before clinical application, but laseracceleratedelectron beams present a promising scheme for future radiationtherapy.

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