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CAS Accelerator Seminars
NEG (non evaporable getter) Activities at PSI
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Europe/Zurich
WBGB/019 (PSI)
WBGB/019
PSI
Description
The SLS2.0 upgrade foresees the coating of the storage ring vacuum chamber with non evaporable getter (NEG) material in order to reduce the photon induced degassing rate.
Understanding the constrains and possibilities related to NEG coating is of primary importance to properly define the specifications for SLS2.0 vacuum chamber.
In order to get experience with this technology, PSI vacuum group decided to develop small test stands for NEG coating of short vacuum pipes. With the help of various PSI groups (from LMX, Hot Labor, Optics, …) several diagnostic techniques have been identified to characterized adhesion, thickness, atomic composition and morphology of NEG thin films. Collaboration with CERN, which invented the process about 20 years ago, also helps to speed up our learning process.
We could recently produce NEG coating of about 250 nm thickness in a pipe of 20 mm inner diameter. Such coating reduces the pressure by more than two orders of magnitude after activation at 200 degree C (<10-10 mbar). There is still a long way to go until definition of a precise deposition procedure of SLS2.0 dipole chambers and the next step will be to build a coating setup for long chambers (>2m).
