SEY and other material properties studies at cryogenic temperatures

A very low secondary electron yield is confirmed to be the fingerprint of laser treated copper substrates. In future high energy particle accelerators, this feature offers unquestionable advantages for electron cloud mitigation purposes. Thermal programmed desorption between 20 and 70 K by dosing Ar multilayers of different thicknesses on a laser treated copper substrate and on its flat counterpart are here reported. The results show that, as a consequence of their nanostructured porous morphology, the desorption of gas from the laser treated substrates occurs in a much broader and higher temperature range with respect to what is observed from the flat substrates. These findings suggest that vacuum transient eects against temperature fluctuations should be better evaluated, if such surfaces would be included as cryogenic vacuum components in accelerators.