Complex technological solutions for particle accelerators

An advantage of complex technological solutions that address a few problems is demonstrated on two examples: laser ablation surface engineering (LASE) and non-evaporable getter (NEG) coated surfaces. NEG coating is not only the best vacuum solution for UHV/XHV accelerator vacuum chamber but can also provide electron cloud mitigation. LASE surface can provide not only SEY <1 (which is sufficient for e-cloud elimination but also reduces ther- mal and particle stimulated gas desorption). Both LASE and NEG has been characterised for their surface resistance and its impact on a beam wakefield impedance. It has been demonstrated that the surface resistance for both LASE and NEG can be reduced to meet the specification on the required surface resistance and provide the required vacuum and e-cloud mitigation properties.