High-Coherence Electron and Ion Bunches from Laser-Cooled Atoms

28th International Conference on Photonic, Electronic and Atomic Collisions

McCulloch, A.J.^1 ; Sheludko, D.V.^1 ; Putkunz, C.T.^1 ; Saliba, S.D.^1 ; Thompson, D.J.^1 ; Speirs, R.W.^1 ; Murphy, D.^1 ; Torrance, J.^1 ; Sparkes, B.M.^1 ; Scholten, R.E.^1

ARC Centre of Excellence for Coherent X-Ray Science, School of Physics, University of Melbourne, Australia^1

关键词: Diffractive imaging;    Dynamic process;    Electron bunch;    Femto-second laser;    High brightness;    Laser-cooled atoms;    Space charge effects;    Transverse coherence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/488/1/012045/pdf
DOI  :  10.1088/1742-6596/488/1/012045

来源: IOP

【 摘 要 】

Cold atom electron and ion sources produce electron bunches and ion beams by photoionisation of laser cooled atoms. They offer high coherence and the potential for high brightness, with applications including ultrafast electron diffractive imaging of dynamic processes at the nanoscale. Here we present our cold atom electron/ion source, with an electron temperature of less than 10 K and a transverse coherence length of 10 nm. We also discuss experiments investigating space-charge effects with ions and the production of ultra-fast electron bunches using a femto-second laser. In the latter experiment we show that it is possible to produce both cold and fast electron bunches with our source.