2018/10/19 by Yun Chang Shin, Shin, Yun Chang, W. M. Snow +11
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Nuclear Physics and Applications #Quantum, superfluid, helium dynamics
paper · pdf · doi:10.48550/arxiv.1810.08722
openalex publication_date 2018/10/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The concept of a small-scale, pulsed-proton accelerator based compact\nultracold neutron (UCN) source is presented. The essential idea of the compact\nUCN source is to enclose a volume of superfluid 4\He converter\nwith a supercold moderator in the vicinity of a low-radiation neutron\nproduction target from (p, n) reactions. The supercold moderator should possess\nan ability to produce cold neutron flux with a peak brightness near the\nsingle-phonon excitation band of the superfluid 4\He converter,\nthereby augmenting the UCN production in the compact UCN source even with very\nlow intensity of neutron brightness. The performance of the compact UCN source\nis studied in terms of the UCN production and thermal load in the UCN\nconverter. With the proposed concept of the compact UCN source, a UCN\nproduction rate of P\UCN=80\UCN/\cc/\sec\nin the UCN converter could be obtained while maintaining thermal load of on the\nsuperfluid 4\He and its container at a level of 22\mW.\nThis study shows that the compact UCN source can produce a high enough density\nof UCN at a small-scale, low-energy, pulsed-proton beam facility with reduced\nefforts on the cooling and radiation protection.\n