Bambus: a new inelastic multiplexed analyser for Panda at MLZ

Abstract:

Neutron scattering is an instrumental tool for the investigation of condensedmatter. Of the selection of of techniques available, cold-neutron triple-axisspectrometers (TAS) are focussed on the investigation of low-energy excita-tions in a wide region of condensed matter physics from magnetism to super-conductivity. This technique gives us the ability to measure individual points inreciprocal space as a function of both scattering vector and energy change ofthe neutron, i.e. (Q, E) space, and is especially suited to parametric studies asa function of field and temperature. This is in contrast to the broad overviewgiven by time-of-flight techniques, which measure multiple points in (Q, E)space but which tend to take long counting times to acquire useful data, allow-ing for only a few fields or temperatures to be measured. Recently, new engin-eering solutions have allowed for an intermediate concept to be developed:multiplexing analysers for TAS, which measure multiple points at the sametime, increasing the useful data which can be collected and perhaps bridgingthe gap between the two existing techniques. Following this concept, the multi-plexing analyser BAMBUS is being developed for use on the TAS spectro-meter PANDA at MLZ in Garching, led by TU Dresden and in cooperation withJCNS. Its design takes advantage of the relative efficiency of Bragg diffractionfor so-called neutron analyser crystals when compared to their transmission,allowing for the analysis of multiple neutron energies along the same path.This has been designed as a complementary module to the traditional TASset-up, allowing for both to be used within a single experiment, and is expec-ted to be commissioned in 2021.

BigBlueButton (TUD): https://selfservice.zih.tu-dresden.de/l/link.php?meeting_id=39478&pin=e2ee70c7

BigBlueButton (external): https://selfservice.zih.tu-dresden.de/link.php?meeting_id=39478&pin=3e09404f