Coatings and coating systems Two main strategies to coat the vacuum chambers for the magnets of the SPS: 1.The chamber is OUTSIDE the magnet 2.The chamber.

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Presentation transcript:

Coatings and coating systems Two main strategies to coat the vacuum chambers for the magnets of the SPS: 1.The chamber is OUTSIDE the magnet 2.The chamber is kept INSIDE the magnet CHAMBER INSIDE MAGNET × Coating temperature limited to 150oC × Coating limited to shutdowns × Radiation issues × Chemical treatment limited and expensive not necessary to open dipoles × high production rate requires large space and many coating systems CHAMBER OUTSIDE MAGNET coating temperature > 150oC work independent of shutdowns no radiation issues easy chemical cleaning × welding/machining after coating and open/close dipole very high production rate (~40 chambers/week with LSS system)

Coatings and coating systems Two main strategies to coat the vacuum chambers for the magnets of the SPS: 1.The chamber is OUTSIDE the magnet 2.The chamber is kept INSIDE the magnet CHAMBER INSIDE MAGNETCHAMBER OUTSIDE MAGNET Magnetron sputtering (with permanent magnets) Magnetron sputtering (with the dipole’s field) Plasma Assisted Chemical Vapour deposition. (PACVD) Hollow Cathode Discharge sputtering Magnetron sputtering (magnetic field by external solenoide)

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) MBB vacuum chamber Housing vacuum chamber External solenoide Bottom extention with MBB crossection

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Rectangular graphite cathode 60mm wide and 7400 mm long (built from 30x1000 mm pieces)

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Rectangular graphite cathode 60mm wide and 7400 mm long (built from 30x1000 mm pieces)

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Rectangular graphite cathode 60mm wide and 7400 mm long (built from 30x1000 mm pieces) Very stable and uniform discharge Substrate temperature ~230 o C Good thickness uniformity

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Rectangular graphite cathode 60mm wide and 7400 mm long (built from 30x1000 mm pieces) Very stable and uniform discharge Substrate temperature ~230 o C Good thickness uniformity SEY~1.0 after coating. No ageing after 70 days in N2.

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Rectangular graphite cathode 60mm wide and 7400 mm long (built from 30x1000 mm pieces) Very stable and uniform discharge Substrate temperature ~230 o C Good thickness uniformity SEY~1.0 after coating. No ageing after 70 days in N2. NO AGEING AFTER MBB ASSEMBLING

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Rectangular graphite cathode 60mm wide and 7400 mm long (built from 30x1000 mm pieces) Very stable and uniform discharge Substrate temperature ~230 o C Good thickness uniformity SEY~1.0 after coating. No ageing after 70 days in N2. NO AGEING AFTER MBB ASSEMBLING

Coatings and coating systems CHAMBER OUTSIDE MAGNET: Magnetron sputtering (magnetic field by external solenoide) Conclusions Coating the tubes outside the magnets works Installation in the magnets do not pollute the chamber The possibility to coat at high temperature is a plus Weak point: fragile cathode Next steps Coat MBA tubes Design a more robust cathode Start the design of the large scale production system? (design office)

Coatings and coating systems CHAMBER INTSIDE MAGNET: Magnetron sputtering with permanent magnets Slit to insert the permanent magnetic system Graphite cathode Magnetic circuit and cathode erosion

Coatings and coating systems CHAMBER INTSIDE MAGNET: Magnetron sputtering with permanent magnets Magnetic circuit and cathode erosion

Coatings and coating systems CHAMBER INTSIDE MAGNET: Magnetron sputtering with permanent magnets Magnetic circuit and cathode erosion Graphite cathodes plasmas

Coatings and coating systems CHAMBER INTSIDE MAGNET: Magnetron sputtering with permanent magnets Magnetic circuit and cathode erosion Relief sample

Coatings and coating systems CHAMBER INTSIDE MAGNET: Magnetron sputtering with permanent magnets Magnetic circuit and cathode erosionsample Relief: fractal like: due to ion bombardment during coating? SEY:0.98 after coating; 1.05 after 3.5 months in lab (Al foil) How to avoid this relief? Avoid localized ion bombardment by displacing the magnetic system

Coatings and coating systems CHAMBER INTSIDE MAGNET: Magnetron sputtering with permanent magnets Conclusions Magnetron sputtering with permanent magnets is promising Low ageing (due to ion bombardment?) If we master the relief, it is worth to invest in a longer prototype Next steps Coating with constant displacement of the magnetic system Built and test a 1 meter long prototype If it works, build a 6.4 meter long prototype.