001034920 001__ 1034920
001034920 005__ 20250512115734.0
001034920 0247_ $$2doi$$a10.3390/jne6010003
001034920 0247_ $$2datacite_doi$$a10.34734/FZJ-2025-00035
001034920 0247_ $$2WOS$$aWOS:001482835400001
001034920 037__ $$aFZJ-2025-00035
001034920 082__ $$a620
001034920 1001_ $$0P:(DE-Juel1)130729$$aIoffe, Alexander$$b0
001034920 245__ $$aA concept of a para-hydrogen-based cold neutron source for simultaneous high flux and high brightness
001034920 260__ $$aBasel$$bMDPI$$c2025
001034920 3367_ $$2DRIVER$$aarticle
001034920 3367_ $$2DataCite$$aOutput Types/Journal article
001034920 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1738589572_11958
001034920 3367_ $$2BibTeX$$aARTICLE
001034920 3367_ $$2ORCID$$aJOURNAL_ARTICLE
001034920 3367_ $$00$$2EndNote$$aJournal Article
001034920 520__ $$aA novel concept of cold neutron source employing chessboard or staircase assemblies of high-aspect-ratio rectangular para-hydrogen moderators with well-developed and practically fully illuminated surfaces of the individual moderators is proposed. An analytic approach for calculating the brightness of para-hydrogen moderators is introduced. Because the brightness gain originates from a near-surface effect resulting from the prevailing single-collision process during thermal-to-cold neutron conversion, high-aspect-ratio rectangular cold moderators offer a significant increase, up to a factor of 10, in cold neutron brightness compared to a voluminous moderator. The obtained results are in excellent agreement with MCNP calculations. The chessboard or staircase assemblies of such moderators facilitate the generation of wide neutron beams with simultaneously higher brightness and intensity compared to a para-hydrogen-based cold neutron source made of a single moderator (either flat or voluminous) of the same cross-section. Analytic model calculations indicate that gains of up to approximately 2.5 in both brightness and intensity can be achieved compared to a source made of a single moderator of the same width. However, these gains are affected by details of the moderator–reflector assembly and should be estimated through dedicated Monte Carlo simulations, which can only be conducted for a particular neutron source and are beyond the scope of this general study. The gain reduction in our study, from a higher value to 2.5, is mostly caused by these two factors: the limited volume of the high-density thermal neutron region surrounding the reactor core or spallation target, which restricts the total length of the moderator assembly, and the finite width of moderator walls. The relatively large length of moderator assemblies results in a significant increase in pulse duration at short pulse neutron sources, making their straightforward use very problematic, though some applications are not excluded. The concept of “low-dimensionality” in moderators is explored, demonstrating that achieving a substantial increase in brightness necessitates moderators to be low-dimensional both geometrically, implying a high aspect ratio, and physically, requiring the moderator’s smallest dimension to be smaller than the characteristic scale of moderator medium (about the mean free path for thermal neutrons). This explains why additional compression of the moderator along the longest direction, effectively giving it a tube-like shape, does not result in a significant brightness increase comparable to the flattening of the moderator.
001034920 536__ $$0G:(DE-HGF)POF4-6G4$$a6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4)$$cPOF4-6G4$$fPOF IV$$x0
001034920 536__ $$0G:(DE-HGF)POF4-632$$a632 - Materials – Quantum, Complex and Functional Materials (POF4-632)$$cPOF4-632$$fPOF IV$$x1
001034920 588__ $$aDataset connected to CrossRef, Journals: juser.fz-juelich.de
001034920 65027 $$0V:(DE-MLZ)SciArea-220$$2V:(DE-HGF)$$aInstrument and Method Development$$x0
001034920 65017 $$0V:(DE-MLZ)GC-2002-2016$$2V:(DE-HGF)$$aInstrument and Method Development$$x0
001034920 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0
001034920 7001_ $$0P:(DE-HGF)0$$aKonik, Peter$$b1
001034920 7001_ $$0P:(DE-HGF)0$$aBatkov, Konstantin$$b2
001034920 773__ $$0PERI:(DE-600)3040700-X$$a10.3390/jne6010003$$gVol. 6, no. 1, p. 3 -$$n1$$p3 -$$tJournal of nuclear engineering$$v6$$x2673-4362$$y2025
001034920 8564_ $$uhttps://juser.fz-juelich.de/record/1034920/files/Invoice_MDPI_jne-3327107_797.65EUR.pdf
001034920 8564_ $$uhttps://juser.fz-juelich.de/record/1034920/files/jne-06-00003.pdf$$yOpenAccess
001034920 8767_ $$83327107$$92025-01-03$$a1200210320$$d2025-01-15$$eAPC$$jZahlung erfolgt$$pjne-3327107
001034920 909CO $$ooai:juser.fz-juelich.de:1034920$$pdnbdelivery$$popenCost$$pVDB$$pVDB:MLZ$$pdriver$$pOpenAPC$$popen_access$$popenaire
001034920 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)130729$$aForschungszentrum Jülich$$b0$$kFZJ
001034920 9131_ $$0G:(DE-HGF)POF4-6G4$$1G:(DE-HGF)POF4-6G0$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lGroßgeräte: Materie$$vJülich Centre for Neutron Research (JCNS) (FZJ)$$x0
001034920 9131_ $$0G:(DE-HGF)POF4-632$$1G:(DE-HGF)POF4-630$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lVon Materie zu Materialien und Leben$$vMaterials – Quantum, Complex and Functional Materials$$x1
001034920 9141_ $$y2025
001034920 915pc $$0PC:(DE-HGF)0000$$2APC$$aAPC keys set
001034920 915pc $$0PC:(DE-HGF)0003$$2APC$$aDOAJ Journal
001034920 915__ $$0StatID:(DE-HGF)0150$$2StatID$$aDBCoverage$$bWeb of Science Core Collection$$d2024-12-09
001034920 915__ $$0LIC:(DE-HGF)CCBY4$$2HGFVOC$$aCreative Commons Attribution CC BY 4.0
001034920 915__ $$0StatID:(DE-HGF)0600$$2StatID$$aDBCoverage$$bEbsco Academic Search$$d2024-12-09
001034920 915__ $$0StatID:(DE-HGF)0112$$2StatID$$aWoS$$bEmerging Sources Citation Index$$d2024-12-09
001034920 915__ $$0StatID:(DE-HGF)0501$$2StatID$$aDBCoverage$$bDOAJ Seal$$d2023-04-12T15:01:04Z
001034920 915__ $$0StatID:(DE-HGF)0500$$2StatID$$aDBCoverage$$bDOAJ$$d2023-04-12T15:01:04Z
001034920 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
001034920 915__ $$0StatID:(DE-HGF)0030$$2StatID$$aPeer Review$$bASC$$d2024-12-09
001034920 915__ $$0StatID:(DE-HGF)0561$$2StatID$$aArticle Processing Charges$$d2024-12-09
001034920 915__ $$0StatID:(DE-HGF)0199$$2StatID$$aDBCoverage$$bClarivate Analytics Master Journal List$$d2024-12-09
001034920 915__ $$0StatID:(DE-HGF)0700$$2StatID$$aFees$$d2024-12-09
001034920 915__ $$0StatID:(DE-HGF)0030$$2StatID$$aPeer Review$$bDOAJ : Anonymous peer review$$d2023-04-12T15:01:04Z
001034920 920__ $$lyes
001034920 9201_ $$0I:(DE-Juel1)JCNS-FRM-II-20110218$$kJCNS-FRM-II$$lJCNS-FRM-II$$x0
001034920 9201_ $$0I:(DE-588b)4597118-3$$kMLZ$$lHeinz Maier-Leibnitz Zentrum$$x1
001034920 980__ $$ajournal
001034920 980__ $$aVDB
001034920 980__ $$aUNRESTRICTED
001034920 980__ $$aI:(DE-Juel1)JCNS-FRM-II-20110218
001034920 980__ $$aI:(DE-588b)4597118-3
001034920 980__ $$aAPC
001034920 9801_ $$aAPC
001034920 9801_ $$aFullTexts