1. A new thermal triple-axis spectrometer at the research reactor FRJ-2.
- Author
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Conrad, H., Brückel, TH., Budwig, A., Bussmann, K., Engels, R., Fracassi, V., Heinen, J., Heybutzki, H., Ioffe, A., Küssel, E., Kulessa, T., Pap, M., Schmitz, B., Suxdorf, F., and Zeiske, T.
- Subjects
NUCLEAR reactors ,ELASTIC scattering ,POLARIZATION (Nuclear physics) ,NEUTRONS ,MONOCHROMATORS ,HELIUM ,DETECTORS - Abstract
A high intensity triple-axis spectrometer is described, which has been commissioned only a year before the final shut-down of the FRJ-2 reactor in May 2006. It was designed both as an instrument for quasi-elastic scattering with polarisation analysis on an area detector, and as a triple-axis spectrometer with polarization analysis for measurements of magnetic and nuclear inelastic scattering. The instrument features two exchangeable monochromators (Cu [200] and PG [002]), which enable both horizontal and vertical focusing. High monochromatic neutron current densities at the sample position of up to 4×10
7 cm-2 s-1 (for pyrolytic graphite at 34 meV) and energies of up to 117 meV (with copper) have been achieved at the FRJ-2 (thermal flux density: 3×1014 cm-2 s-1 ). The utilization of3 He filters both as polarizer and analyzer will enable polarization analysis for high-energy neutrons. The spectrometer is presently being prepared for installation at the new Chinese research reactor CARR at the China Institute of Atomic Energy in Fang Shan near Beijing. [ABSTRACT FROM AUTHOR]- Published
- 2008
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