Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 89: Surface Dynamics II

O 89.11: Vortrag

Freitag, 15. März 2013, 13:00–13:15, H33

Mono-energetic target surface electron (TSE) beams produced via surface guiding and acceleration in femtosecond laser-solid interactions — •Jingyi Mao¹, Liming Chen², Xulei Ge², Lu Zhang², Wenchao Yan², Dazhang Li³, Guoqian Liao², Jinglong Ma², Kai Huang², Yutong Li², Xin Lu², Quanli Dong², Zhiyi Wei², Zhengming Sheng², and Jie Zhang^2,4 — ¹TU Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, Germany — ²Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, CAS, Beijing 100190, China — ³Institute of High Energy Physics, CAS, Beijing 100049, China — ⁴Department of Physics, Shanghai Jiao tong University, Shanghai 200240, China

Highly collimated MeV TSE guiding has been observed along the target surface following the interaction of bulk target irradiation by femtosecond laser pulses at relativistic intensities[1]. The beam quality is shown to depend critically on the laser contrast: with a ns prepulse, the generated electron beam is well concentrated and intense, while high laser contrast produces divergent electron beams. In the case of large preplasma scale lengths on the target surface, tunable guiding and acceleration of TSE is achieved by changing the laser incident angle. By expanding the preplasma scale length to several hundred micrometers, we obtained MeV monoenergetic TSE beam with 100 pC per laser pulse and divergence angles of only 3 degrees, which could be used as a stable injector for accelerators.

[1] J. Y. Mao et al., Phys. Rev. E. 85, 025401(R)(2012)