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Methoden und Instrumentierung Poster: Mi., 14:00–16:30 M-P40
New 2D-detector for the time-of-flight SANS-instrument YuMo @ IBR-2
Alexander I. Kuklin 1 , Akhmed Kh. Islamov 1 , André Gabriel 2 , Valentin I.
Gordeliy 1 , Götz Eckold 3
1 Frank Laboratory of Neutron Physics, JINR, 141980 Dubna, Russia – 2 EMBL Grenoble,
6, rue Jules Horowitz, BP-181 F-38042 Grenoble Cedex 9, France – 3 Institute of
Physical Chemistry, University of Göttingen, D-37077 Göttingen, Germany
As a result of an international co-operation, a new two-dimensional position sensitive
detector was developed for small angle diffraction at the time-of-flight instrument YuMo
@ IBR-2. Based on the wire matrix and delay-line technology, this detector provides a
spatial resolution better than 4 mm. The sensitive area is 580 x 580 mm 2 . The body of
the detector is made from aluminium providing an effective thickness of 40 mm which
is filled with 3 He up to a pressure of 10 bar. Thus, the device is optimised for neutrons
with wavelengths between 0.7 and 6 ˚A that are available at the YuMo instrument. As
a unique feature, the detector exhibits a central hole of 70 mm diameter for the direct
beam as shown in the figure below. This is particularly useful if a two detector system is
used that covers a large range of wave vector transfers simultaneously without the need
of changing distance between sample and detector. In this contribution we report on
the first test results of this detector under real experiment conditions. The performance
of detector along with electronics and data acquisition allows to accept integrated count
rates of more than 1.7 MHz. With this new device, the field of application of YuMo
is extended to anisotropic phenomena that become more and more important in the
future.
This project has been funded by the German Federal Ministry of Education and
Research under contract no. 03DU03G2.
Fig. 1: 2D-detector for the YuMo instrument