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TUXC04 |
Electron Desorption From Porous Materials of Interest for Future Accelerators | |
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Funding: ARYA project funded by INFN Scientific National Committee 5 Laser ablated Cu surfaces (LASE) have been proposed to mitigate electron cloud phenomena due to their porous structure*. When such surfaces are used as cryogenic components in accelerators, they will undergo thermal fluctuation, photon, and e-irradiation. A rigorous evaluation of their overall behavior in such vacuum conditions is clearly required. Our studies on thermal desorption of gas from LASE have shown that the morphology gives rise to a vaster and higher desorption temperature (T) with respect to what has been observed from a flat surface**. This implies that gas desorption from LASE will occur in an unexpected T range, but also that cryosorbed gas will be on those surfaces at temperatures and quantities very different from what is expected to occur on flat surfaces. This gas can participate in other desorption mechanisms, such as e-desorption. Here we report some measurements of e-desorption yield from such LASE treated surfaces at low T. Such results can be useful to predict the gas quantity finally delivered in accelerators’ cryogenic vacuum from a porous surface under e-irradiation. * R. Valizadeh et al. , Appl. Surf. Sci. 404, 370 (2017) ** L. Spallino et al. , Phys. Rev.. Accel. Beams 23, 063201 (2020) |
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