RadioNet is a consortium of 27 institutions in Europe, Republic of Korea and South Africa, integrating at European level world-class infrastructures for research in radio astronomy. These include radio telescopes, telescope arrays, data archives and the globally operating European Network for Very Long Baseline Interferometry (EVN). RadioNet is de facto widely regarded to represent the interests of radio astronomy in Europe. A comprehensive, innovative and ambitious suite of actions is proposed that fosters a sustainable research environment. Building on national investments and commitments to operate these facilities, this specific EC program leverages the capabilities on a European scale. The proposed actions include: - Merit-based trans-national access to the RadioNet facilities for European and for the first time also for third country users; and integrated and professional user support that fosters continued widening of the community of users. - Innovative R&D, substantially enhancing the RadioNet facilities and taking leaps forward towards harmonization, efficiency and quality of exploitation at lower overall cost; development and delivery of prototypes of specialized hardware, ready for production in SME industries. - Comprehensive networking measures for training, scientific exchange, industry cooperation, dissemination of scientific and technical results; and policy development to ensure long-term sustainability of excellence for European radio astronomy. RadioNet is relevant now, it enables cutting-edge science, top-level R&D and excellent training for its European facilities; with the Atacama Large Millimetre Array (ALMA) and the ESFRI-listed Square Kilometre Array (SKA) defined as global radio telescopes, RadioNet assures that European radio astronomy maintains its leading role into the era of these next-generation facilities by involving scientists and engineers in the scientific use and innovation of the outstanding European facilities.

For more than two decades, the EU has been supporting free transnational access (TA) to existing national research infrastructures (RI). In particular, the optical/infrared and the advanced radio astronomy communities are now recognised as TA flagship communities. Their telescopes and instrumentation complement each other with respect to wavelength coverage, as well as spectral, spatial and time resolution, and therefore together form a cohesive suite of RIs that made ground breaking discoveries possible and thus strengthened Europe's leading role in international science. While scientists more and more rely on multi-wavelength and multi-disciplinary access to the best RIs, there is a quest by the RI providers for a sustainable funding scheme for TA, since establishing and maintaining outstanding RIs requires considerable resources. In this pilot, the best research institutions from both communities will combine their efforts to further improve and harmonize their services and to make best use of their RIs, allowing mutual and TA to telescopes, telescope networks, and data archives. This will facilitate multi-wavelengths and time-domain studies. TA shall be simplified by the development of a common proposal submission tool. Improved instruments, adaptive optics, and software to deliver science ready data products will boost the performance of our RIs. This pilot will address imminent threats to astronomical research from satellite mega constellations and commercial radio emitters, and finally, it will develop plans for a long-term mutual relationship and for a continued funding of TA beyond this pilot.

ACME (the Astrophysics Centre for Multi-messenger studies in Europe) addresses the EC Call to provide wider, simplified, and more efficient access to the best research infrastructures (RI) available to researchers in the astronomy and astroparticle physics communities. ACME is set up to realize an ambitious coordinated European-wide optimization of the accessibility and cohesion between multiple leading RI, offering access to instruments, data and expertise, focused on the new science of multi-messenger astrophysics. ACME will forge a basis for strengthened long-term collaboration between these RI irrespective of location. Collaboration and user training will be specifically aimed at levelling up access opportunities across Europe and beyond. ACME objectives are: - implement the European roadmaps’ recommendations and act as a pathfinder to broaden, improve and align access to the respective RI services and data, and assess and evaluate new models for better coordination and provision of at-scale services - provide harmonized and inclusive trans-national and virtual access to world-class RI - develop centres of expertise providing expert support to enable easier access for more researchers - improve science data products management to facilitate both focused research goals and serendipitous discoveries, implementing FAIR approaches to broaden access - improve interoperable systems for rapid identification of astrophysical candidate events, and alert distribution to the network of RI and scientific consortia to optimize follow-up observations - provide training for a new and broader generation of scientists and engineers - open the astrophysics and astroparticle physics data sets to other disciplines, such as environmental studies or marine biology for the undersea neutrino facilities and increase citizen engagement in scientific research

The goal of the RADIOBLOCKS project is to achieve a maximal boost for the European major world-leading research infrastructures in radio astronomy, which over the years have invested heavily in maintaining existing facilities as well as in substantial upgrade programmes, after identifying common challenges towards their mid- and long-term scientific visions. In this project, the institutes responsible of these facilities join forces, together with partners from industry and academia, in order to develop “common building blocks” for technological solutions beyond state-of-the-art, that will enable a broad range of new science and enhance European scientific competitiveness. They share the need to continuously improve their capabilities in order to enable new science: sensitivity, field of view, bandwidth, angular, time and frequency resolution, commensality and on-sky time, reaction time and RFI mitigation. Engagement with industry to co-develop advanced technologies will increase the partners’ technological levels and strengthen their market positions, creating a true European innovation system. This project carries out carefully targeted development work and addresses common aspects in the complete data chain, categorizing this in four phases: Novel detectors and components, digital receivers, transport and correlator, and data (post)processing. We will design and demonstrate common building blocks based on cutting-edge technologies, that will be enablers and extenders in the areas most critical to the RIs, and can and will be used for upgrades of several RIs. The building blocks will be new instrument components and advanced digital solutions based on newly available (HPC/AI optimized) hardware. This approach will enable a tremendous increase of the science delivery potential of Europe’s major radio astronomical observatories, for science cases that are high on their long-term agendas, aimed at the widest possible science community in Europe and beyond.