Speaker
Description
D. Gorkov a,b,c, G. Waldherr b, A. Grünwald a,b,c, J. Stein a, S. Giemsa c, P. Böni c, and M. Braden a
a II. Physikalisches Institut der Universität zu Köln, D-50937 Köln, Germany.
b Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München,
D-85747 Garching, Germany.
c Physik-Department E21, Technische Universität München,
D-85747 Garching, Germany
KOMPASS is a polarized cold-neutron three axes spectrometer (TAS) currently undergoing its final con¬struction phase at the MLZ in Garching. The instrument is designed to exclusively work with polarized neutrons and optimized for zero-field spherical neutron polarization analysis for measuring all elements of the polarization matrix.
In contrast to other TASs, KOMPASS is equipped with a unique polarizing guide system. The static part of the guide system hosts a series of three polarizing V-cavities providing a highly polarized beam with expected polarization above 98%. The exchangeable straight and parabolic front-end sections of the guide system allow adapting the instrument resolution for any particular experiment and provide superior energy- and Q-resolution values when compared with the existing conventional guide and instrument concepts [1, 2].
In combination with the end position of the cold neutron guide NL-1, the large doubly focusing monochromator and analyzer using highly oriented pyrolytic graphite, the cavity of trapezoidal geometry for analysis of polarization of scattering beam, the KOMPASS TAS will be very well suited to study various types of weak magnetic order and excitations in variety of complex magnetic structures. Special emphasis was put on a compact design of the instrument in order to maximize intensity.
[1] M. Janoschek et al., Nucl. Instr. and Meth. A 613 (2010) 119.
[2] A. C. Komarek et al., Nucl. Instr. and Meth. A 647 (2011) 63.
The construction of KOMPASS is funded by the BMBF through the Verbundforschungsprojekt 05PK16PK1.
