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Carbon Coatings : - storage - co-sputtering. M.Taborelli , for the SPSU team. Storage and aging of a-C: air vs N 2 for samples from MBB#2 magnet. -Storage in air is made in a polymer box, possibly too harsh condition -N 2 is beneficial -To be confirmed, only 2 samples for the moment. - PowerPoint PPT Presentation
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21/4/2009
Carbon Coatings :- storage - co-sputtering
M.Taborelli , for the SPSU team
21/4/2009
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energy[eV]
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MBB_top_20090302_1
MBB#2 top in N2 for 1 month 2009-04-06
MB040 1 month in air 2009-04-06
Storage and aging of a-C: air vs N2 for samples from MBB#2 magnet
-Storage in air is made in a polymer box, possibly too harsh condition-N2 is beneficial-To be confirmed, only 2 samples for the moment
21/4/2009
Plan for comparison of different storage and SEY aging
Storage in polymer box as before
Storage in dry air (in desiccators) (less water)
Storage in polymer box in large desiccator. (less water, but possibly hydrocarbons)
Storage in N2 gas ( pump down and inject N2 gas ) (the most clean)
Samples wrapped in Al foil in air or in the box.
21/4/2009
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energy [eV]
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CAr_p15 B Day1
CAr_p15 B Day 10
CAr_p15 B in N2 for 1 month
CAr_p15 B in air for 1 month
Possible alternative to a-C: C-Cu co-deposition
In planar magnetron configuration, at room temperatureAim: more sp2
-shape of the curve points toward roughness-again N2 storage is good
21/4/2009
Thickness 680 nm (15A)
Thickness 2000 nm (15B)
Roughness
21/4/2009
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924928932936940944948952956960964968972binding energy [eV]
inte
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Cu2p CAr_p15 B initial
Cu2p CAr_p15 B 1 month in air
Cu2p CAr_p15 B 1 month in N2
Cu or Cu2O
CuO orCu(OH)2
Cu2p
Different aging in air and N2 visible as oxidation of Cu…but it is not necessarily the effect which increases SEY
21/4/2009
Other work in progress Investigate relation between a-C coating roughness and substrate
temperature
Investigate other means to make rough underlayers (electrodeposited Cu, black Cr…….)
Recovery of SEY on a-C with bake-out, sputter-cleaning
Improve TDS procedure (geometry of samples) to be able to quantify H concentration in the coatings
Produce coatings with applied bias voltage (more compact = less outgassing?)
Investigate the relation between pumpdown and thickness
Produce liners more similar to MBB coatings
Improve uniformity of coatings in MBA/B geometry