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Suppression of surface effect by using bent-perfect-crystal monochromator in residual strain scanning

SYSNO ASEP	0047446
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Ostatní články
Title	Suppression of surface effect by using bent-perfect-crystal monochromator in residual strain scanning
Title	Eliminace povrchového jevu vyskytujícího se při mapování residuálních napětí pomocí použití fokusujícího monochromátoru na bázi ohnutého dokonalého krystalu
Author(s)	Vrána, Miroslav (UJF-V)_RID Mikula, Pavol (UJF-V)_{RID, ORCID, SAI}
Source Title	Materials Science Forum - ISSN 0255-5476 490/491, - (2005), s. 234-238
Number of pages	5 s.
Language	eng - English
Country	CH - Switzerland
Keywords	neutron diffraction ; residual strain scanning ; bent monochromator
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	GA202/03/0891 GA ČR - Czech Science Foundation (CSF)
	KSK1010104 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
CEZ	AV0Z1048901 - UJF-V
Annotation	Using our long experience in Bragg diffraction optics we successfully used focusing principles for substantial increasing both luminosity and resolution of the strain scanners with respect to the conventional devices. Monochromatic neutrons are selected by the cylindrically bent monochromator from the reactor spectrum. The strong correlation between wavelength and direction of incoming and outgoing beams depending on the monochromator bending radius can be used for suppression of surface effect in residual strain scanning. In scanning near a sample surface aberration peak shifts arise due to the fact that the gauge volume defined by input and output slits is partially out of the sample and its value can be of the same order as the residual strain effects. In this work we demonstrate that by changing of the bending radius of monochromator, this surface effect can be suppressed to values smaller then experimental errors in residual strain scanning.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2007

Number of the records: 1