Dimensional Extreme Magnetic Neutron Diffractometer
DEMAND | HB-3A | HFIR
A list of equipment available at DEMAND can be found in the Sample Environment Equipment Database. The database contains detailed equipment specifications and images, drawings and other documents when available.
| Temperature (Cryostats) | 1.7 K to 300 K |
| Temperature (Closed Cycle Refrigerator) | 4 K to 700 K |
| Temperature (Ultra-Low temperature device) | Down to 0.03 K |
| Magnetic field | Up to 6 T vertical field |
| Pressure | Up to 10 GPa CuBe and DAC |
| Electric field | Up to 10000 V/cm |
Closed Cycle Refrigerators—Bottom Loader
Typically used for single crystal experiments with four-circle mode, the bottom loading CCR has an operating temperature range of 3.6 K – 700 K (base/highest temperature dependent on particular CCR used). The standard sample is mounted in a single crystal sample can that has been vacuum sealed with an indium gasket in an inert atmosphere—for high temperature experiments, the indium gasket is omitted. The distance between the sample mount to beam center is a 2.375” (60 mm). Cooling to base takes approximately 2 hrs. High temperature bottom loading CCRs can reach temperatures up to 700 K and have a ¼-28 female interface and a 2.375” (60.3 mm) distance from the sample mount to beam center. Contact the DEMAND instrument team for more information.
Liquid Helium Cryostats—ILL Orange Cryofurnace and Oxford Variox
The top loading liquid helium cryostats have a base temperature of 1.5 K and can be used with ultra-low temperature inserts described below. The setup of DEMAND is two-axis mode. Cooling to base takes approximately 1.5 hrs. The same sample cans as used for the Janis CCR are used for the liquid helium cryostats. The sample mounts on the same ¼-28 female interface. The distance from the mounting interface to beam center varies from 1.75” (44.5 mm) to 2.44” (62 mm). The standard bore diameter is 1.9” (50 mm), however 2.75” (70 mm) and 3.937” (100 mm) diameter bores are available on the Orange cryostat for use with ultra-low temperature inserts. For concerns regarding sample mounting, contact the DEMAND instrument team.
How to change a sample in an ILL Orange Cryostat: SampleChangeforOrangeCryostat.pdf
Cryomagnets
Two vertical field cryomagnets are available for use on the WAND. Mag-i has a maximum vertical field of 6 T and Mag-B of 5 T. Both have an operating temperature range of 1.5 K – 300 K. Mag-B has a 1.9” (50 mm) diameter bore. Contact the DEMAND instrument team for experiment planning.
How to change a sample in Mag-B: Operations for Sample Change in a Dynamic CTI QSG.pdf
Ultra-Low Temperature Inserts—Dilution Refrigerator and 3He
Two types of ultra-low temperature inserts are available for use with the Orange and Variox liquid helium cryostats as well as the Mag-B cryomagnet. The Oxford Dilution insert reaches a base temperature of 0.03 K and the 3He insert of 0.3 K.
Pressure Cells
A 6 kbar Al-helium gas pressure cell is available for use in an Orange cryostat for in situ pressure changes. Various BeCu clamp pressure cells (up to 2 GPa) are available for higher pressure experiments. The pressure capabilities and currently expanding. Contact the DEMAND instrument team for more information.
Additional Sample Environments
Additional custom specialized sample environments may be accommodated at the DEMAND—e.g. electric field, current tuning, etc. Users are strongly encouraged to discuss experimental needs with the DEMAND instrument team before requesting custom sample environments for their proposals.
Sample Holders
Various sample holders are available for single crystal sample mounting with custom mounts provided as needed. Users are strongly encouraged to discuss experimental needs with the DEMAND instrument team.
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