Dresden 2006 – wissenschaftliches Programm
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VA: Vakuumphysik und Vakuumtechnik
VA 4: Instruments for neutrons
VA 4.8: Vortrag
Montag, 27. März 2006, 17:00–17:20, HSZ 101
A double monochromator device for the CONRAD radiography instrument at HMI and applications — •Markus Strobl1,2, Nikolay Kardjilov1, André Hilger1,2, Wolfgang Treimer1,2, and Ingo Manke1 — 1Hahn Meitner Institut Glienickerstr 100 14109 Berlin — 2Univerity of Applied Sciences (TFH) Luxemburger Str. 10 , 13353 Berlin
CONRAD is the new cold neutron radiography and tomography instrument at the Hahn Meitner Institute in Berlin which recently started operation as a part of the Berlin Neutron Scattering Centre (BENSC). It includes two measurement positions of which the first one directly at the end of the NL1b neutron guide was used to install a flexible monochromator device as an additionally available insert. While the CONRAD instrument uses in standard operation the full cold spectrum of the lower part of the guide a first PCG[002] monochromator with a mosaic spread of app. 1 degree is placed in the upper beam part deflecting neutrons downwards. The initial lower beam part is blocked by a shutter and on a linear manipulation table behind it the second corresponding graphite crystal is installed. Hence, while both crystals can be rotated to chosen Bagg angles, the second one can be positioned in along the original beam direction in order to reflect the monochromatic beam from the first crystal into the initial beam path of the CONRAD instrument. This construction enables to choose a monochromatic beam with wavelengths between 0.25 nm and 0.65 nm for high resolution imaging at the second measurement position of CONRAD app. 5 m downstream. Applications are ranging from energy selective radiography to stress mapping.