Senior Instrument Development Scientist, Neutron Sciences Directorate
Dr. Ehlers joined the Spallation Neutron Source (SNS) in 2003 as the lead instrument scientist for beam line 5, the Cold Neutron Chopper Spectrometer (CNCS). CNCS is a high-resolution, direct geometry, cold neutron, inelastic multi-chopper spectrometer, designed to make use of neutrons in the energy range below 50 meV. Dr. Ehlers led the construction of the instrument from 2003 to 2007 and its operation until 2017. In 2017 he assumed a more general role in the directorate in which he coordinates neutron instrumentation upgrade programs both at HFIR and at SNS.Before joining the SNS, Dr. Ehlers worked at the Institute Laue-Langevin (ILL), a leading European neutron research facility situated in Grenoble, France for six years. At ILL he was an instrument scientist for the spin-echo spectrometers IN11 and IN15, and established a strong research program using the neutron spin echo technique in the study of geometrically frustrated and other exotic magnetic materials. While at ILL, he also helped launch a project to build a new spin echo instrument known as the Wide Angle Neutron Spin Echo Spectrometer Project (WASP).Dr. Ehlers has published more than 170 research articles in international peer reviewed journals. He is a referee for the APS journals, the Journal of Physics Condensed Matter, Physical Chemistry Chemical Physics, and Nuclear Instruments and Methods.