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Conditioning StSt in the lab : energy dependence - PowerPoint PPT Presentation


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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. Playing with venting of the system: results not reproducible, but……. sometimes very low SEY . unbaked vac. system

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Conditioning StSt in the lab : energy dependence


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slide1

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

slide2

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

slide3

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