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College Park, Maryland      June 6 - 10 , 2004

T2-C4 (2:15 PM): 2D-Multi-Wire Position-Sensitive Gaseous Neutron Detectors with Relative Resolutions higher than 0.5%

R. Kampmann (Institute for Materials Research, GKSS Research Centre, 21502 Geesthacht, Germany; DENEX Detectors for Neutrons and X-rays GmbH, Moldenweg 9a, 21335 Lueneburg, Germany), M. Marmotti (DENEX Detectors for Neutrons and x-rays GmbH, Moldenweg 9a, 21335 Lueneburg, Germany), R. Georgii (ZWE FRM-II / Physik-Department E21, Technical University Munich, 85748 Garching, Germany), M. Haese-Seiller, V. Kudryashov (Institute for Materials Research, GKSS Research Centre, 21502 Geesthacht, Germany)

Two delay-line based 2D-multi-wire position-sensitive gaseous detectors (MW-PSGD) with very high relative resolution (Rr) defined as the position resolution in percentage of the detector dimension have recently been developed for the instruments REFSANS and MIRA at the new German high flux reactor FRM-II. The REFSANS detector has an active area of Aa = (500 mm)2, a wire pitch of 2 mm and Rr = 0.4 %, the MIRA detector is smaller (Aa = (200 mm)2 and has a wire pitch of 1 mm resulting in Rr = 0.5 %. These Rr-values demonstrate a substantial progress in the technology of 2D-MW-PSGD's because hitherto the actual limit of resolution for such detectors has been Rr = 0.8 %. The design, the spatial resolution and the discrimination of gamma-radiation of the detectors are presented. Finally, the count rate capability of these modern delay-line based detectors is discussed for the case that they are linked to modern multi-hit TDC based data acquisition systems.

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