Design and Construction of the Ultracold Neutron Source at the NC State PULSTAR Research Reactor PDF Download

Author: Grant R. Palmquist
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Languages : en
Pages : 130

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Languages : en
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Ultracold neutrons (UCN) are neutrons with energies below about 330 neV, making it possible to store them in material bottles for hundreds of seconds and guide them into a variety of experiments. Until recently, the available UCN flux has limited the range of problems which can be addressed with UCN. In 2000, a series of experiments at LANSCE demonstrated that a solid deuterium superthermal source, coupled to a spallation target, can potentially provide orders of magnitude improvements in useful UCN density. Since these prototype experiments, a production UCN source has been constructed for the UCNA collaboration in Line B at LANSCE, and another solid deuterium source has been designed to operate at the PULSTAR reactor at NC State university, based on the similar principles. This work will present the initial results and analysis of the LANL UCN source performance and some of the development and design issues for the PULSTAR source. Also a Monte-Carlo analysis of UCN depolarization measurement had been included as a UCN transport study.

Author: Bruce Anthony Morgen
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Languages : en
Pages : 402

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Languages : en
Pages : 10

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The Advanced Neutron Source (ANS) is a user facility for all areas of neutron research proposed for construction at the Oak Ridge National Laboratory. The neutron source is planned to be a 350-MW research reactor. The reactor, currently in conceptual design, will belong to the United States Department of Energy (USDOE). The safety approach and planned elements of the safety program for the ANS are described. The safety approach is to incorporate USDOE requirements (which, by reference, include appropriate requirements from the United States Nuclear Regulatory Commission (USNRC) and other national and state regulatory agencies) into the design, and to utilize probabilistic risk assessment (PRA) techniques during design to achieve extremely low probability of severe core damage. The PRA has already begun and will continue throughout the design and construction of the reactor. Computer analyses will be conducted for a complete spectrum of accidental events, from anticipated events to very infrequent occurrences. 8 refs., 2 tabs.

Author: Kaushal Kishor Mishra
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Languages : en
Pages : 108

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Keywords: Neutron Imaging.

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Languages : en
Pages : 12

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Research reactors in the United States are becoming more and more outdated, at a time when neutron scattering is being recognized as an increasingly important technique in areas vital to the US scientific and technological future. The last US research reactor was constructed over 25 years ago, whereas new facilities have been built or are under construction in Japan, Russia and, especially, Western Europe, which now has a commanding lead in this important field. Concern over this situation in the early 1980's by a number of organizations, including the National Academy of Sciences, led to a recommendation that design work start urgently on an advanced US neutron research facility. This recommendation is realized in the Advanced Neutron Source Project. The centerpiece of the Advanced Neutron Source will be a new research reactor of unprecedented flux (>7.5 x 1019 m−2{center dot}s−1), equipped with a wide variety of state-of-the-art spectrometers and diffractometers on hot, thermal, and cold neutron beams. Very cold and ultracold neutron beams will also be provided for specialized experiments. This paper will discuss the current status of the design and the plans for scattering instrumentation. 5 refs.

Author:
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Languages : en
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Author: American Nuclear Society
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Category : Nuclear engineering
Languages : en
Pages : 850

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Languages : en
Pages : 504

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The Advanced Neutron Source will be a new world-class facility for research using hot, thermal, cold, and ultra-cold neutrons. The heart of the facility will be a 330-MW (fission), heavy-water cooled and heavy-water moderated reactor. The reactor will be housed in a central reactor building, with supporting equipment located in an adjoining reactor support building. An array of cold neutron guides will fan out into a large guide hall, housing about 30 neutron research stations. Appropriate office, laboratory, and shop facilities will be included to provide a complete facility for users. The ANS is scheduled to begin operation at the Oak Ridge National Laboratory early in the next decade. This PDR document defines the plant-level requirements for the design, construction, and operation of ANS. It also defines and provides input to the individual System Design Description (SDD) documents. Together, this PDR document and the set of SDD documents will define and control the baseline configuration of ANS.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 504

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Book Description
The Advanced Neutron Source will be a new world-class facility for research using hot, thermal, cold, and ultra-cold neutrons. The heart of the facility will be a 330-MW (fission), heavy-water cooled and heavy-water moderated reactor. The reactor will be housed in a central reactor building, with supporting equipment located in an adjoining reactor support building. An array of cold neutron guides will fan out into a large guide hall, housing about 30 neutron research stations. Appropriate office, laboratory, and shop facilities will be included to provide a complete facility for users. The ANS is scheduled to begin operation at the Oak Ridge National Laboratory early in the next decade. This PDR document defines the plant-level requirements for the design, construction, and operation of ANS. It also defines and provides input to the individual System Design Description (SDD) documents. Together, this PDR document and the set of SDD documents will define and control the baseline configuration of ANS.