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Carbon Coatings : - storage - co-sputtering

This study aims to compare the storage and aging of a-C coatings in air and N2 environments, investigate the effect of C-Cu co-deposition on the coating's properties, and explore the relationship between roughness and substrate temperature. Other ongoing work includes improving TDS procedures, producing coatings with applied bias voltage, and enhancing coating uniformity.

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Carbon Coatings : - storage - co-sputtering

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  1. Carbon Coatings : - storage - co-sputtering M.Taborelli , for the SPSU team

  2. 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

  3. 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.

  4. Possible alternative to a-C: C-Cu co-deposition In planar magnetron configuration, at room temperature Aim: more sp2 -shape of the curve points toward roughness -again N2 storage is good

  5. Roughness Thickness 680 nm (15A) Thickness 2000 nm (15B)

  6. Different aging in air and N2 visible as oxidation of Cu …but it is not necessarily the effect which increases SEY

  7. 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

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