Facility to coat the SPS magnets with carbon Objective: coat at least 90% of the SPS with a carbon thin film with low secondary electron emission in order.

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Presentation transcript:

Facility to coat the SPS magnets with carbon Objective: coat at least 90% of the SPS with a carbon thin film with low secondary electron emission in order to mitigate electron cloud. Objects to coat: dipoles (MBB+MBA = 70%), Quadrupoles (QD+QF = 10%), LSS (10%), eventually SSS (10%). The pumping port shields shall also be coated.

Facility to coat the SPS magnets with carbon Objective: coat at least 90% of the SPS with a carbon thin film with low secondary electron emission in order to mitigate electron cloud. Objects to coat: dipoles (MBB+MBA = 70%), Quadrupoles (QD+QF = 10%), LSS (10%), eventually SSS (10%). The pumping port shields shall also be coated. Quadrupoles, drift tubes for LSS and SSS, and pumping port shields will be coated in actual facility (b. 181-R-F12) (potential conflicts with NEG coating for LHC have not yet been analyzed) Surface cleaning is mandatory prior to coat. Two options: 1) wet cleaning; 2) plasma cleaning (validation foreseen for 2014).

Facility to coat the SPS magnets with carbon Surface requirements: 600 m 2 (+100m2 for storage); >18 tons crane. Close to BA3 or BA5. (avoid road transport and easy extraction from tunnel ) Production constrains: ~1000 magnets to be cleaned and coated in one year (LS2) => 6 / day. Coating systems required to assure such pace: 1) if wet cleaning 12; 2) if plasma cleaning 16. (two dipoles piled up per coating system). Production steps for each dipole: TE-VSC Surface cleaning coating Dismount from SPS transport to coating lab TE-MSC Transport To SPS installation TE-MSC

WET CLEANINGPLASMA CLEANING Surface required600 (+100) m 2 Manpower Advantages Is Independent of coating systems Less handling of dipoles The same people for cleaning and coating; Disadvantages Handling of radioactive liquids (0.5 Ton / dipole); Install “demineralized” water circuit. Requires more coating systems Wet vs Plasma cleaning

Coating system 16 meter Dipoles pilled up by two Pumping system + gas injection + plasma generator + step motor Structure to support graphite cathode And stainless steel anode (in case of plasma cleaning)

16 coating systems in parallel 32 meter 19 meter

The prototype coating system (b.181-R-G12)