Journal of Neutron Research - Volume 25, issue 3-4

Authors: Santoro, V. | Abou El Kheir, O. | Acharya, D. | Akhyani, M. | Andersen, K.H. | Barrow, J. | Bentley, P. | Bernasconi, M. | Bertelsen, M. | Beßler, Y. | Bianchi, A. | Brooijmans, G. | Broussard, L. | Brys, T. | Busi, M. | Campi, D. | Chambon, A. | Chen, J. | Czamler, V. | Deen, P. | DiJulio, D.D. | Dian, E. | Draskovits, L. | Dunne, K. | El Barbari, M. | Ferreira, M.J. | Fierlinger, P. | Fröst, V.T. | Folsom, B.T. | Friman-Gayer, U. | Gaye, A. | Gorini, G. | Gustafsson, A. | Gutberlet, T. | Happe, C. | Han, X. | Hartl, M. | Holl, M. | Jackson, A. | Kemp, E. | Kamyshkov, Y. | Kittelmann, T. | Klinkby, E.B. | Kolevatov, R. | Laporte, S.I. | Lauritzen, B. | Lejon, W. | Linander, R. | Lindroos, M. | Marko, M. | Márquez Damián, J.I. | McClanahan, T.C. | Meirose, B. | Mezei, F. | Michel, K. | Milstead, D. | Muhrer, G. | Nepomuceno, A. | Neshvizhevsky, V. | Nilsson, T. | Odén, U. | Plivelic, T. | Ramic, K. | Rataj, B. | Remec, I. | Rizzi, N. | Rogers, J. | Rosenthal, E. | Rosta, L. | Rücker, U. | Samothrakitis, S. | Schreyer, A. | Selknaes, J.R. | Shuai, H. | Silverstein, S. | Snow, W.M. | Strobl, M. | Strothmann, M. | Takibayev, A. | Wagner, R. | Willendrup, P. | Xu, S. | Yiu, S.C. | Yngwe, L. | Young, A.R. | Wolke, M. | Zakalek, P. | Zavorka, L. | Zanini, L. | Zimmer, O.

Article Type: Research Article

Abstract: The 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. Show more

DOI: 10.3233/JNR-230950

Citation: Journal of Neutron Research, vol. 25, no. 3-4, pp. 85-314, 2023

Authors: Santoro, V. | Abou El Kheir, O. | Acharya, D. | Akhyani, M. | Andersen, K.H. | Barrow, J. | Bentley, P. | Bernasconi, M. | Bertelsen, M. | Beßler, Y. | Bianchi, A. | Brooijmans, G. | Broussard, L. | Brys, T. | Busi, M. | Campi, D. | Chambon, A. | Chen, J. | Czamler, V. | Deen, P. | DiJulio, D.D. | Dian, E. | Draskovits, L. | Dunne, K. | El Barbari, M. | Ferreira, M.J. | Fierlinger, P. | Fröst, V.T. | Folsom, B.T. | Friman-Gayer, U. | Gaye, A. | Gorini, G. | Gustafsson, A. | Gutberlet, T. | Happe, C. | Han, X. | Hartl, M. | Holl, M. | Jackson, A. | Kemp, E. | Kamyshkov, Y. | Kittelmann, T. | Klinkby, E.B. | Kolevatov, R. | Laporte, S.I. | Lauritzen, B. | Lejon, W. | Linander, R. | Lindroos, M. | Marko, M. | Márquez Damián, J.I. | McClanahan, T.C. | Meirose, B. | Mezei, F. | Michel, K. | Milstead, D. | Muhrer, G. | Nepomuceno, A. | Neshvizhevsky, V. | Nilsson, T. | Odén, U. | Plivelic, T. | Ramic, K. | Rataj, B. | Remec, I. | Rizzi, N. | Rogers, J. | Rosenthal, E. | Rosta, L. | Rücker, U. | Samothrakitis, S. | Schreyer, A. | Selknaes, J.R. | Shuai, H. | Silverstein, S. | Snow, W.M. | Strobl, M. | Strothmann, M. | Takibayev, A. | Wagner, R. | Willendrup, P. | Xu, S. | Yiu, S.C. | Yngwe, L. | Young, A.R. | Wolke, M. | Zakalek, P. | Zavorka, L. | Zanini, L. | Zimmer, O.

Article Type: Research Article

Abstract: A key aim of the HighNESS project for the European Spallation Source is to enable cutting-edge particle physics experiments. This volume presents a conceptual design report for the NNBAR experiment. NNBAR would exploit a new cold lower moderator to make the first search in over thirty years for free neutrons converting to anti-neutrons. The observation of such a baryon-number-violating signature would be of fundamental significance and tackle open questions in modern physics, including the origin of the matter-antimatter asymmetry. This report shows the design of the beamline, supermirror focusing system, magnetic and radiation shielding, and anti-neutron detector necessary for the …experiment. A range of simulation programs are employed to quantify the performance of the experiment and show how background can be suppressed. For a search with full background suppression, a sensitivity improvement of three orders of magnitude is expected, as compared with the previous search. Civil engineering studies for the NNBAR beamline are also shown, as is a costing model for the experiment. Show more

DOI: 10.3233/JNR-230951

Citation: Journal of Neutron Research, vol. 25, no. 3-4, pp. 315-406, 2023