Extraction of Ultracold Neutrons from a Solid Deuterium Source PDF Download
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Author: Tomasz Bryś
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Author: Tomasz Bryś
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Author: A. P. Serebrov
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Category :
Languages : en
Pages : 25
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Author:
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Languages : en
Pages :
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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: Yanping Xu
Publisher:
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Category :
Languages : en
Pages :
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Keywords: ucn transport, depolarization, ultracold neutron source.
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Languages : en
Pages :
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Research in fundamental physics with the free neutron is one of the key tools for testing the Standard Model at low energies. Most prominent goals in this field are the search for a neutron electric dipole moment (EDM) and the measurement of the neutron lifetime. Significant improvements of the experimental performance using ultracold neutrons (UCN) require reduction of both systematic and statistical errors.rnThe development and construction of new UCN sources based on the superthermal concept is therefore an important step for the success of future fundamental physics with ultracold neutrons. rnSignificant enhancement of today available UCN densities strongly correlates with an efficient use of an UCN converter material. The UCN converter here is to be understood as a medium which reduces the velocity of cold neutrons (CN, velocity of about 600 m/s) to the velocity of UCN (velocity of about 6 m/s).rnSeveral big research centers around the world are presently planning or constructing new superthermal UCN sources, which are mainly based on the use of either solid deuterium or superfluid helium as UCN converter.rnThanks to the idea of Yu. Pokotilovsky, there exists the opportunity to build competitive UCN sources also at small research reactors of the TRIGA type. Of course these smaller facilities don't promise high UCN densities of several 1000 UCN/cm3, but they are able to provide densities around 100 UCN/cm3 for experiments.rnIn the context of this thesis, it was possible to demonstrate succesfully the feasibility of a superthermal UCN source at the tangential beamport C of the research reactor TRIGA Mainz. Based on a prototype for the future UCN source at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRMII) in munich, which was planned and built in collaboration with the Technical University of Munich, further investigations and improvements were done and are presented in this thesis. rnIn parallel, a second UCN source for the radial beamport D was designed.
Author: Thorsten Lauer
Publisher:
ISBN:
Category :
Languages : en
Pages : 164
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Author: Daniele Tortorella
Publisher:
ISBN:
Category :
Languages : en
Pages : 137
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Author: R. Golub
Publisher: Routledge
ISBN: 1351406396
Category : Science
Languages : en
Pages : 328
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Book Description
Ultra-Cold Neutrons is a complete, self-contained introduction and review of the field of ultra-cold neutron (UCN) physics. Over the last two decades, developments in UCN technology include the storage of UCN in material and magnetic bottles for time periods limited only by the beta decay rate of the free neutron. This capability has opened up the possibility of a wide range of applications in the fields of both fundamental and condensed state physics. The book explores some of these applications, such as the search for the electric dipole moment of the neutron that constitutes the most sensitive test of time reversal invariance yet devised. The book is suitable as an introduction to the field for research students, as a useful compendium of results and techniques for researchers, and is of general interest to nonspecialists in other areas of physics such as neutron, atomic, and fundamental physics and neutron scattering.
Author: Albert Steyerl
Publisher: World Scientific
ISBN: 9811212724
Category : Science
Languages : en
Pages : 500
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Book Description
Ultracold Neutrons is a guide to a fascinating topic. It describes how a simple new idea in experimental neutron physics has changed the landscape of what is often called 'fundamental physics.' Ultracold neutrons (UCNs) are neutrons moving at the low speed of a bicycle rider. They were produced for the first time 50 years ago (in 1968) and are distinguished from ordinary neutrons with much higher energies by their ability to be confined in 'neutron bottles' for durations up to several hundred seconds. This is possible since they are reflected back and forth from the container walls many thousands of times with very little loss. As a result of these long observation times, their properties and interactions with the environment can be studied with superb precision.Directed towards a general readership, this book is an excellent introduction to a field of research that is not highly specialized but touches on many aspects of our physical world, classical as well as quantum mechanical.
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Languages : en
Pages :
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Ultra-cold neutrons (UCN) from the LANSCE super-thermal deuterium source were used to fill an acrylic bottle coated with deuterated polystyrene. The bottle was constructed to minimize losses through the filling valve. The storage time was extracted from a series of measurements where the number of neutrons was counted after they were held in the bottle for durations varying from 60-1200 s. The data were collected at temperatures of 18, 40, 65, 105, and 295 K. The data has been analyzed in terms of the ratio of the imaginary to real part of the wall potential. The analysis considers the velocity dependence of the probability per bounce of wall loss. The implication of these measurements for the SNS electric dipole moment search will be presented.
