Diamond-like carbon coated ultracold neutron guides

Heule, S.; Atchison, F.; Daum, M.; Foelske, Annette; Henneck, R.; Kasprzak, M.; Kirch, K.; Knecht, A.; Kuźniak, M.; Lippert, Thomas; Meier, Matthias M.; Pichlmaier, A.; Straumann, U.

doi:10.1016/j.apsusc.2007.02.139

Cited by 9 publications

(3 citation statements)

References 15 publications

(20 reference statements)

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“…UCN can be guided by total reflection in tubes either made of a suitable neutron reflecting material or coated with such a material. The transport is accompanied by many wall reflections and hence the loss probability per wall collision is an important quantity [3,11,14,15,28,33,40,42,43,49,53,61,64,66,71], as well as transport losses by diffuse reflection. As known, for a rough surface the probability of diffuse scattering is approximately given by ∼( d/λ) 2 [42,49,64], where d is the average surface roughness and λ the UCN wavelength.…”

Section: Ucn Transportmentioning

confidence: 99%

The source for ultra-cold neutrons at the FRM II

Frei

2023

JNR

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At the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) of the Technical University of Munich (TUM) a new source for ultra-cold neutrons (UCN) with a solid deuterium converter is currently under construction. This summary paper shall give an overview of the project and its current status. Research results concerning converter preparation, para-to-ortho conversion, radiation effects and neutron transport, which have been achieved in the last years, are presented and their relevance and transferability for the design of a future UCN source at the European Spallation Source (ESS) are discussed.

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Section: Ucn Transportmentioning

confidence: 99%

The source for ultra-cold neutrons at the FRM II

Frei

2023

JNR

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“…For completeness of this short overview, we have to mention rapidly growing applications of diamond-like-coatings (DLC) for UCN vessels. Analogous to advantages of diamond nanoparticles, DLC provide the highest critical velocity and low UCN losses [ 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ]. DLC coating using IBS technique (ion beam sputtering) with extremely small surface roughness on a flat surface could be even used for long storage of UCN at specular trajectories [ 76 ].…”

Section: Motions Of Nanoparticles At Surface—quasi-elastic Reflectmentioning

confidence: 99%

Application of Diamond Nanoparticles in Low-Energy Neutron Physics

et al. 2010

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Diamond, with its exceptionally high optical nuclear potential and low absorption cross-section, is a unique material for a series of applications in VCN (very cold neutron) physics and techniques. In particular, powder of diamond nanoparticles provides the best reflector for neutrons in the complete VCN energy range. It allowed also the first observation of quasi-specular reflection of cold neutrons (CN) from disordered medium. Effective critical velocity for such a quasi-specular reflection is higher than that for the best super-mirror. Nano-diamonds survive in high radiation fluxes; therefore they could be used, under certain conditions, in the vicinity of intense neutron sources.

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“…(Graphite, in comparison, has sp 2 bonds, lower density, and a potential of about 180 neV.) Diamondlike carbon is widely used in industry and techniques for making high-quality coatings are well established. A detailed systematic study of all relevant characteristics for UCN applications is in progress [8,9].…”

Section: Introductionmentioning

confidence: 99%