NESE

Setting the scene

Mineralogy Petrology Geochemistry Volcanology

Rock Physics Geomaterials Magnetism

Cryosphere Planetary Solar System Science

Energy Resources Environment

Instruments development

Instrument Development
The Use of Inelastic Neutron Scattering for the Study of the Earth Sciences. Inelastic Neutron Scattering What can you learn? Elastic constants Thermodynamic properties -Specific heat -Equation of state -Lattice expansion Predictions of melting temperatures Understanding phase transitions Hydrogen dynamics -The bonding of hydrogen -The diffusion of hydrogen Dynamics in glasses and liquids. -Viscosity -Diffusion	Neutron Instruments MARI Spectrometer at ISIS. IN1 hot neutron three-axis spectrometer at ILL. Prisma Spectrometer at ISIS. MAPS-Chopper Spectrometer for Single Crystal Studies at ISIS. MERLIN - a new chopper spectrometer at ISIS. LET low-energy multi-chopper spectrometer for a second target station at ISIS.	Presentation (PDF 5.2MB)	Steve Bennington S.M.Bennington@rl.ac.uk
Tracking geochemical reactions and going deep into the Earth with high intensity neutron powder diffraction at D20, ILL D20 at ILL provides the highest available intensity in constant wavelength neutron powder and liquid diffraction. D20 an ideal tool for in-situ diffraction studies with time constants even below a second and encourages the use of difficult sample environments. The continuous and simultaneous detection of series of complete diffraction patterns is necessary for the investigation of phase transitions during variation of a parameter like pressure or temperature (thermodiffractometry).	Very high pressures can be obtained with the Paris-Edinburgh cells. Cryogenic medium pressure equipment allows the investigation of the kinetics of CO2- and CH4-gashydrate formation and decomposition at given gaseous pressures and temperatures. A dedicated furnace with vanadium heating element allows investigations on powders and liquids from room temperature up to 1300 C without significant background contributions from the sample environment.	Presentation (PDF, 23MB)	Thomas Hansen Institut Laue-Langevin 6 rue Jules Horowitz BP 156, 38042 Grenoble Cedex 9, France hansen@ill.fr
At the limit of source brilliance: Advanced Nondispersive Focusing Optics For Thermal Neutrons Kirkpatrick-Baez neutron super mirrors can efficiently focus neutron beams into small areas with a maximum divergence that is limited by the mirror critical angle. The size of the focal spot is primarily determined by geometrical demagnification of the source and by figure errors in the mirror shape.	Ray tracing calculations show that highperformance Kirkpatrick-Baez supermirrors can preserve neutron-source brilliance when focusing down to tens of microns and can focus ? two orders of magnitude greater power into 100 ?m than is practical without focusing. The predicted performance is near the theoretical limit set by the source brilliance.	Presentation (PDF 2.5MB)	Judy Pang OAK RIDGE NATIONAL LABORATORY PO BOX 2008 MS6118 OAK RIDGE TN 37831-6118 pangj@ornl.gov