Thermal treatment platforms

Chemical treatment cabinets

  • Integrated chemical treatment station for elliptical cavities (h ≤ 150 cm).
  • Buffered chemical polishing (BCP) station for 1/4 and 1/2 wave cavities

Technical means:
  • PNF bath: H3PO485% – HNO365% et HF40% in the proportions 2.4 – 1– 1,
  • Acid tank with a capacity of 200 l,
  • Acid circulation from bottom upwards with a maximum flow rate of 30 l/min,
  • Gravity draining,
  • PVDF piping,
  • Station under ventilated fume hood.


Integrated chemical treatment station

Vertical electropolishing cabinet


Chemical and electrochemical treatment of elliptical cavities (maximum cavity height: 1.8 m and maximum mass: 200 kg).
This station allows one to perform chemical or electrochemical polishing of the internal surface of niobium cavities.

Technical means:
  • Power supply: 20 V, 1200 A,
  • Acid flow rate: 40 l / min,
  • 300 l acid tank,
  • Pipe and pumps made of PFA material, teflon coating of the acid tank,
  • Cavities are handled by a crane with specific tooling for each cavity. The station is also equipped with a table for horizontally inserting the cathodes.
  • Use of rotating cathode for uniform material removal (CEA-KEK-Marui collaboration)

Vertical electropolishing cabinet


CEA - Saclay (France)


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