Recently, laser processing of copper samples has been demonstrated to produce rough surfaces whose nano-structuring ensures unquestionable advantages for electron cloud mitigation in future particle accelerators. The actual application of laser treated surfaces in accelerators implies that this new material is compliant with many issues, going from impedance vacuum properties to many others. A significant experimental effort is therefore ongoing to study and optimize their various properties of interest. Here we analyze their vacuum behavior versus temperature. To this end, we studied thermal programmed desorption from CO, CH${}_4$ and H${}_2$ once cryo-adsorbed on laser treated copper substrate and on its flat counterpart. These molecules are typically present in the residual vacuum of any accelerator. The results show that the desorption of such gasses from the laser treated substrates occurs in a much broader and higher temperature range with respect to what is observed from the flat substrate. We also show that, at equal doses, treated samples adsorb/desorb significantly more gas than their flat counterpart. These findings can be ascribed to their nano-structured porous morphology. A quantitative analysis is given, allowing to properly estimate fluctuations of the number of molecules during unavoidable temperature variations of the cryogenic vacuum system.

中文翻译：

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激光处理铜对低温泵浦气体的热脱附

最近，已证明对铜样品进行激光加工可产生粗糙的表面，其纳米结构可确保在未来的粒子加速器中减轻电子云的毫无疑问的优势。激光处理过的表面在加速器中的实际应用表明，这种新材料符合许多问题，从阻抗真空特性到许多其他问题。因此，正在进行大量的实验工作，以研究和优化其感兴趣的各种特性。在这里，我们分析它们的真空行为与温度的关系。为此，我们研究了从CO，CH的热程序解吸${}_4$ 和H${}_2$一次低温吸附在激光处理过的铜基板及其平坦的对应基板上。这些分子通常存在于任何促进剂的残留真空中。结果表明，相对于从平坦基板上观察到的气体，这些气体从激光处理过的基板上的解吸发生在更宽和更高的温度范围内。我们还表明，在相同剂量下，处理后的样品比平的样品吸收/解吸的气体明显更多。这些发现可以归因于其纳米结构的多孔形态。进行了定量分析，可以正确估计低温真空系统不可避免的温度变化过程中分子数目的波动。