Monte Carlo Simulations of the SANS Instrument in Petten
The small-angle neutron-scattering facility at the 45MW high-flux reactor in Petten, The Netherlands,
was constructed in the late 1980s. It has a q-range of 5 x 103 to 0.4A° 1, operating at a fixed wavelength of 4.75A° , which is realized by six pairs of double pyrolytic graphite monochromators.
In this paper, we study the flux gain for the instrument installed at a neutron guide by Monte Carlo simulations using the program packages McStas [L. Lefmann, K. Nielsen, Neutron News 10 (1999) 320; P. Willendrup, E. Farhi and K. Lefmann, Physica B 350 (2004) 735] and Vitess [G. Zsigmond et al., Nucl. Instrum. Methods A 529 (2004) 218; http://www.hmi.de/projects/ess/vitess/]. In doing so, the
instrument is relocated from its current position to the HB10 radial beam tube, the double monochromator is replaced by a velocity selector and neutron guides are used for transporting the neutrons.
UCA Okday;
OHMS Carsten;
2008-11-14
ELSEVIER SCIENCE BV
JRC42668
0921-4526,
www.elsevier.com/locate/physb,
https://publications.jrc.ec.europa.eu/repository/handle/JRC42668,
10.1016/j.physb.2008.07.007,
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