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In this paper, the effect of air exposure and acetone cleaning on the secondary electron yield (SEY) of laser treated copper applied in accelerators for the inhibition of electron cloud was investigated and discussed. The SEY of laser treated copper samples after acetone cleaning and air exposure was measured. After 10-21 months air exposure, the maximum SEY increased by about 11%-20%. Furthermore, changes of carbon, copper, and oxygen chemistry states from sample surface after acetone and air exposure were studied by means of X-ray photoelectron spectroscopy. The XPS results show that the concentration of Cu from the surface of the samples with the thickness of 500 and 20 &#x03BC;m decreased by about 61%-70% after acetone cleaning and decreased by a further 36%-70% after 10-21 months air exposure. Moreover, the XPS measurement reflects the significant increase of the total percentages of C and O after acetone cleaning, and further increase after 10-21 months air exposure. The increase of SEY is explained in terms of the introduction of impurities, such as oxide and carbide.

The Effect of Air Exposure on SEY and Surface Composition of Laser Treated Copper Applied in Accelerators