Periodic magnetic field as a polarized and focusing thermal neutron spectrometer and monochromator

Cremer, Jay Theodore; Williams, Dudley; Fuller, Michael J.; Gary, C. K.; Piestrup, M. A.; Pantell, R. H.; Feinstein, J.; Flocchini, Robert G.; Boussoufi, M.; Egbert, H.P.; Kloh, M. D.; Walker, Raymond W.

doi:10.1063/1.3274512

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…The idea of using this magnetic force on neutrons is not new. It has been used in several applications, as, for example, in the design of neutron polarizers, neutron focusers, neutron spectrometers and monochromators [9]. However, the potential use of this force has not been proposed, as far as the authors know, for a multistage neutron multiplier.…”

Section: Statement Of the Core Idea: The Use Of The Spin Of Neutrmentioning

confidence: 99%

A Neutron Diode for Subcritical Multistage Multipliers with Special Reference in Tritium Breeding

Arias

Parks

2016

J Fusion Energ

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Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Journal of fusion energy.La publicació final està disponible a Springer a través de http://dx.doi.org/10.1007/s10894-015-0049-7 This is a copy of the author 's final draft version of an article published in the Journal of fusion energy. In this paper the interaction between a magnetic field and the neutron spin magnetic moment is explored for use in the design of a neutron diode or valve that allows a neutron flux to pass in one direction, while preventing a neutron flux in the opposite direction. A neutron diode that ensures the unidirectional movement of neutrons could be used in the design of a subcritical multistage neutron multiplier, a device that has thus far not been realised. With a subcritical multistage neutron multiplier, an initial source of neutrons could be multiplied substantially in a very small area. Such a device could have potential applications in tritium breeding in a fusion reactor, in medicine, in space exploration, etc. Utilizing a simplified geometrical model, a first preliminary study is performed to assess the feasibility of this concept. Keywords. Subcritical multistage neutron multiplier, spin-magnetic field interaction.

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Section: Statement Of the Core Idea: The Use Of The Spin Of Neutrmentioning

confidence: 99%

A Neutron Diode for Subcritical Multistage Multipliers with Special Reference in Tritium Breeding

Arias

Parks

2016

J Fusion Energ

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“…normal dimension, indicating that the array has some of the properties of a cylindrical lens. This phenomenon is related to the deflective focusing in [50], and may be further explored in future work.…”

Section: Stern-gerlach Deflectionmentioning

confidence: 99%

“…For beams of paramagnetic atoms, an inhomogeneous magnetic field can be used for redirection and spin separation [48]. This technique dates back to the Stern-Gerlach experiment and continues to be employed in several recent demonstrations of magnetic lenses and mirrors [1,49,50,51,52,53,10,33,54]. Because many experiments involve high velocity beams with a narrow energy distribution [5,55,56,57,58], manipulation techniques for these particular cases merit further development.…”

Section: Introductionmentioning

confidence: 99%

Neutral Atom Imaging Using a Pulsed Electromagnetic Lens

Gardner¹

2018

Springer Theses

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To Robin, who taught me empathy and discipline; to my parents, who taught me integrity and who made my world a safe place;and to Olive the dog, who did the opposite. AcknowledgementsI must first thank Mark Raizen, whose steady leadership and generous support guided this project through many obstacles. Several problems we encountered, like those with the supersonic valve, seemed preternaturally resistant to logical analysis. Others felt like fundamental flaws in the experimental design. At some points over the past five years, I am reasonably sure that Mark was the only person in the world who believed that our lens would produce images even a fraction as good as those which fill these pages. He has an uncanny ability to see to the core of a problem, and there were many humbling occasions on which this talent quickly outweighed several days' worth of dedicated troubleshooting. More important than offering fast solutions, Mark is always ready to sit down and think through a problem. When the path forward seems irredeemably blocked, meeting with Mark reliably helps to clarify the issue, outline a plan of attack, and lift our spirits. In addition to his scientific leadership, Mark's kindness and compassion set him apart. I have never felt pressured to prioritize this project over my personal well-being, and Mark has demonstrated countless times that his primary goal is not publications or grants but the success of his students. Erik Anciaux joined the project at the end of my second year, and it would be difficult to overstate my debt to him as both a colleague and a friend. Through long periods of slow, discouraging progress, Erik's work ethic remained relentlessly focused. His attitude was buoyant enough to float my own, even when we were both convinced that the entire project was falling apart. Erik has a remarkable capacity to say: "nothing works, and we are very likely moving in the wrong direction; let's get to it." This ability to put one foot in front of the other-even when everything is broken-is something I admire and continuously try to emulate. Lest it be supposed that Erik's work ethic balances an unremarkable natural talent, I should also mention that he is an extremely gifted physicist. Erik's mastery of theoretical concepts and his knack for the minutiae of experimental atom optics make him uniquely qualified to tackle the many puzzles we face. He is personally responsible for breakthroughs like developing the Vespel-Swagelok connection and discovering the source of the double-peak phenomenon, among others. It is not the least bit hyperbolic to say that without Erik this project would not have succeeded. In addition to his scientific v contributions, I am indebted to Erik for his friendship, which made the lab a fun place to work. Our prototype lens was assembled in the chaos of high-volume political debates, often shouted over both the hum of the chopper (D-sharp, I believe) and a classic rock Pandora station (only on Fridays). It is a testament to our friendship that working together in an often-st...

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“…10 This technique dates back to the Stern-Gerlach experiment and continues to be employed in several recent demonstrations of magnetic lenses and mirrors. [11][12][13][14][15][16][17][18] Because many experiments involve high velocity beams with a narrow energy distribution, 6,[19][20][21][22] manipulation techniques for these particular cases merit further development. In this Note, we report the use of a planar Halbach array 23 to either deflect or to specularly reflect a high-velocity, nearly monoenergetic beam of neutral atoms in a spin-sensitive manner.…”

mentioning

confidence: 99%

Note: Manipulation of supersonic atomic beams with static magnetic fields

Gardner

Castillo-Garza

Raizen

2013

The Journal of Chemical Physics

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The inhomogeneous magnetic field of a permanent-magnet planar Halbach array is used to either deflect or to specularly reflect a supersonic beam of neutral atoms. Metastable neon and helium beams are tested to experimentally evaluate the performance of this array in a range of configurations. Results are compared with numerical simulations and the device is presented as a high precision tool for the manipulation of neutral atom beams.

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Periodic magnetic field as a polarized and focusing thermal neutron spectrometer and monochromator

Cited by 8 publications

References 16 publications

A Neutron Diode for Subcritical Multistage Multipliers with Special Reference in Tritium Breeding

A Neutron Diode for Subcritical Multistage Multipliers with Special Reference in Tritium Breeding

Neutral Atom Imaging Using a Pulsed Electromagnetic Lens

Note: Manipulation of supersonic atomic beams with static magnetic fields

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