001021578 001__ 1021578 001021578 005__ 20250701125920.0 001021578 0247_ $$2doi$$a10.48550/ARXIV.2309.17333 001021578 037__ $$aFZJ-2024-00843 001021578 088__ $$2Other$$a 001021578 1001_ $$aSantoro, V.$$b0 001021578 245__ $$aHighNESS Conceptual Design Report 001021578 260__ $$barXiv:2309.17333 [physics.ins-det]$$c2023 001021578 300__ $$a346 p 001021578 3367_ $$2DRIVER$$areport 001021578 3367_ $$2ORCID$$aREPORT 001021578 3367_ $$010$$2EndNote$$aReport 001021578 3367_ $$2DataCite$$aOutput Types/Report 001021578 3367_ $$0PUB:(DE-HGF)29$$2PUB:(DE-HGF)$$aReport$$breport$$mreport$$s1706006130_11732 001021578 3367_ $$2BibTeX$$aTECHREPORT 001021578 520__ $$aThe European Spallation Source, currently under construction in Lund, Sweden, is a multidisciplinary international laboratory. Once completed to full specifications, it will operate the world's most powerful pulsed neutron source. Supported by a 3 million Euro Research and Innovation Action within the EU Horizon 2020 program, a design study (HighNESS) has been completed to develop a second neutron source located below the spallation target. Compared to the first source, designed for high cold and thermal brightness, the new source has been optimized to deliver higher intensity, and a shift to longer wavelengths in the spectral regions of cold (CN, 2--20\,Å), very cold (VCN, 10--120\,Å), and ultracold (UCN, ${>}\,{500}$\,Å) neutrons. The second source comprises a large liquid deuterium moderator designed to produce CN and support secondary VCN and UCN sources. Various options have been explored in the proposed designs, aiming for world-leading performance in neutronics. These designs will enable the development of several new instrument concepts and facilitate the implementation of a high-sensitivity neutron-antineutron oscillation experiment (NNBAR). This document serves as the Conceptual Design Report for the HighNESS project, representing its final deliverable. 001021578 536__ $$0G:(DE-HGF)POF4-632$$a632 - Materials – Quantum, Complex and Functional Materials (POF4-632)$$cPOF4-632$$fPOF IV$$x0 001021578 536__ $$0G:(DE-HGF)POF4-6G4$$a6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4)$$cPOF4-6G4$$fPOF IV$$x1 001021578 588__ $$aDataset connected to DataCite 001021578 650_7 $$2Other$$aInstrumentation and Detectors (physics.ins-det) 001021578 650_7 $$2Other$$aFOS: Physical sciences 001021578 7001_ $$aKheir, O. Abou El$$b1 001021578 7001_ $$aAcharya, D.$$b2 001021578 7001_ $$aAkhyani, M.$$b3 001021578 7001_ $$aAndersen, K. 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