Dresden 2006 – scientific programme
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VA: Vakuumphysik und Vakuumtechnik
VA 4: Instruments for neutrons
VA 4.7: Talk
Monday, March 27, 2006, 16:40–17:00, HSZ 101
The new cold neutron radiography and tomography instrument CONRAD at HMI Berlin — •Nikolay Kardjilov1, André Hilger1,2, Ingo Manke1, Markus Strobl1,2, Wolfgang Treimer1,2, and John Banhart1 — 1Hahn-Meitner-Institut Berlin — 2University of Applied Sciences Berlin (TFH), FB II
The new cold neutron radiography instrument CONRAD is a multifunctional facility for radiography and tomography with cold neutrons at Hahn-Meitner-Institut Berlin. It is located at the end of a curved neutron guide, which faces the cold neutron source of the BER-II research reactor. The geometry provides a cold neutron beam with wavelengths between 0.2 nm and 1.2 nm. Two measuring positions are available for radiography and tomography investigations. The first one is placed at the end of the guide and it is optimized for in-situ experiments in which a high neutron flux is required. The available flux at this position is app. 10^9 cm^-2s^-1. The second measuring position uses a pin-hole geometry which allows better beam collimation (L/D up to 500) and higher image resolution in the range of 200 microns in the CCD based detector system (15 x 15 cm^2). The use of cold neutrons for radiography purposes increases the image contrast and improves the sensibility for e.g. the detection of small amounts of water and hydrogen containing materials in metal matrixes. On the other hand the cold neutron beam can be modified easily by using diffraction and neutron optical techniques. This enables to perform radiography and tomography experiments with more sophisticated measuring techniques. Recent examples of research and industrial applications will be presented.