Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment
The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various experiments, as the first production UCN source ba...
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| creator | Ito, T. M. Adamek, E. R. Callahan, N. B. Choi, J. H. Clayton, S. M. Cude-Woods, C. Currie, S. Ding, X. Fellers, D. E. Geltenbort, P. Lamoreaux, S. K. Liu, C.-Y. MacDonald, S. Makela, M. Morris, C. L. Pattie, R. W. Ramsey, J. C. Salvat, D. J. Saunders, A. Sharapov, E. I. Sjue, S. Sprow, A. P. Tang, Z. Weaver, H. L. Wei, W. Young, A. R. |
| description | The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various experiments, as the first production UCN source based on the superthermal process. It has recently undergone a major upgrade. This paper describes the design and performance of the upgraded LANL UCN source. Measurements of the cold neutron spectrum and UCN density are presented and compared to Monte Carlo predictions. The source is shown to perform as modeled. The UCN density measured at the exit of the biological shield was 184(32) UCN/cm3, a fourfold increase from the highest previously reported. The polarized UCN density stored in an external chamber was measured to be 39(7) UCN/cm3, which is sufficient to perform an experiment to search for the nonzero neutron electric dipole moment with a one-standard-deviation sensitivity of σ(dn)=3×10−27ecm. |
| doi_str_mv | 10.1103/PhysRevC.97.012501 |
| format | Article |
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M. ; Adamek, E. R. ; Callahan, N. B. ; Choi, J. H. ; Clayton, S. M. ; Cude-Woods, C. ; Currie, S. ; Ding, X. ; Fellers, D. E. ; Geltenbort, P. ; Lamoreaux, S. K. ; Liu, C.-Y. ; MacDonald, S. ; Makela, M. ; Morris, C. L. ; Pattie, R. W. ; Ramsey, J. C. ; Salvat, D. J. ; Saunders, A. ; Sharapov, E. I. ; Sjue, S. ; Sprow, A. P. ; Tang, Z. ; Weaver, H. L. ; Wei, W. ; Young, A. R.</creator><creatorcontrib>Ito, T. M. ; Adamek, E. R. ; Callahan, N. B. ; Choi, J. H. ; Clayton, S. M. ; Cude-Woods, C. ; Currie, S. ; Ding, X. ; Fellers, D. E. ; Geltenbort, P. ; Lamoreaux, S. K. ; Liu, C.-Y. ; MacDonald, S. ; Makela, M. ; Morris, C. L. ; Pattie, R. W. ; Ramsey, J. C. ; Salvat, D. J. ; Saunders, A. ; Sharapov, E. I. ; Sjue, S. ; Sprow, A. P. ; Tang, Z. ; Weaver, H. L. ; Wei, W. ; Young, A. R. ; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States) ; Los Alamos National Lab. 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This paper describes the design and performance of the upgraded LANL UCN source. Measurements of the cold neutron spectrum and UCN density are presented and compared to Monte Carlo predictions. The source is shown to perform as modeled. The UCN density measured at the exit of the biological shield was 184(32) UCN/cm3, a fourfold increase from the highest previously reported. 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(ORNL), Oak Ridge, TN (United States)</aucorp><aucorp>Los Alamos National Lab. (LANL), Los Alamos, NM (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment</atitle><jtitle>Phys.Rev.C</jtitle><date>2018-01-29</date><risdate>2018</risdate><volume>97</volume><issue>1</issue><artnum>012501</artnum><issn>2469-9985</issn><eissn>2469-9993</eissn><abstract>The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various experiments, as the first production UCN source based on the superthermal process. It has recently undergone a major upgrade. This paper describes the design and performance of the upgraded LANL UCN source. Measurements of the cold neutron spectrum and UCN density are presented and compared to Monte Carlo predictions. The source is shown to perform as modeled. The UCN density measured at the exit of the biological shield was 184(32) UCN/cm3, a fourfold increase from the highest previously reported. The polarized UCN density stored in an external chamber was measured to be 39(7) UCN/cm3, which is sufficient to perform an experiment to search for the nonzero neutron electric dipole moment with a one-standard-deviation sensitivity of σ(dn)=3×10−27ecm.</abstract><cop>United States</cop><pub>American Physical Society (APS)</pub><doi>10.1103/PhysRevC.97.012501</doi><oa>free_for_read</oa></addata></record> |
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| source | American Physical Society Journals |
| subjects | Accelerator Physics Atomic and Nuclear Physics Instrumentation and Detectors Nuclear Experiment NUCLEAR PHYSICS AND RADIATION PHYSICS Physics |
| title | Performance of the upgraded ultracold neutron source at Los Alamos National Laboratory and its implication for a possible neutron electric dipole moment experiment |
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