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M: Metallphysik

M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)

M 32.33: Poster

Montag, 7. März 2005, 14:30–16:30, Poster TU B

Conceptual design and construction of the cold neutron tomography facility at HMI — •André Hilger^1,2, Nikolay Kardjilov¹, Lounis Mokrani¹, Rudolf Ringel¹, Wolfgang Treimer^1,2, and John Banhart¹ — ¹Hahn-Meitner-Institut, Glienicker Str. 100, 14109 Berlin — ²Technische Fachhochschule Berlin, Luxemburger Str. 10, 13353 Berlin

Neutron tomography is a powerful non-destructive method for the investigation of a large variety of different objects. It allows to visualize the inner volume of a sample without destroying or dismantling it. The different interaction mechanisms of neutrons and X-rays with matter make neutron tomography a complementary technique to classical X-ray tomography. Tomographic imaging with cold neutrons is on one hand highly sensitive to light elements and organic materials. On the other hand, cold neutrons pass easily through metals and other materials composed of heavy elements. A new tomography facility with cold neutrons is under construction at the reactor BER II of the Hahn-Meitner-Institut, Berlin. The new instrument is placed at the end of a curved neutron guide which faces the cold neutron source of the reactor. Two measuring positions are planned. The first one is directly at the end of the neutron guide where an extremely high cold neutron flux of approximately 10⁹ n/cm²s is available. The second measuring position is intended for high-resolution tomography and is located 5 m away from the neutron guide where the flux is only 10⁷ n/cm²s but the beam collimation is much better. The first test experiments at these measuring position have been performed and will be presented.