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Energy Dependence and Surface Effects in Unbaked Vacuum Systems: Insights from E-Gun Experiments

This study examines the energy dependence of secondary electron yield (SEY) in e-gun experiments conducted in a baked system, with no detectable energy dependence observed within the measured range. The research investigates the reproducibility of results when venting the system and highlights inconsistent findings linked to carbon (C) presence on surfaces. It demonstrates that a decrease in SEY to 1.1 corresponds with an increase in carbon accumulation after electron beam irradiation, while noting no significant differences in residual gas composition regarding carbon-bearing species.

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Energy Dependence and Surface Effects in Unbaked Vacuum Systems: Insights from E-Gun Experiments

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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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