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Investigating Energy Dependence in Electron Gun Systems

Research on the energy dependence of electron guns in laboratory conditions, focusing on SEY and carbon presence after e-beam irradiation. Results show no detectable energy dependence but SEY decreases with increased carbon on surface.

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Investigating Energy Dependence in Electron Gun Systems

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  1. Conditioning StSt in the lab : energy dependence e-gun energy All done in a baked system No detectable energy dependence in this range M.T., LIU-SPS 10/10/2012

  2. Playing with venting of the system: results not reproducible, but……. sometimes very low SEY unbaked vac. system (no C increase) unbaked vac. system, (C increase) unbaked vac. system, e-gun taken apart and cleaned (C increase) M.T., LIU-SPS 10/10/2012

  3. Amount of carbon on the surface after e-beam irradiation and resulting SEY 1) In all cases when the SEY decreases to 1.1 there is an increase of C on the surface 2) No obvious differences in the residual gas (for carbon bearing species) M.T., LIU-SPS 10/10/2012

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