Fully portable, highly flexible dilution refrigerator systems for neutron scattering

This paper describes dilution refrigerator systems developed specifically for neutron scattering environments. The refrigerators are completely portable, and yet still retain a large degree of flexibility regarding sample environment. Two types of top loading dilution unit are described. The first, which offers a very low base temperature in the region of 6mK, allows samples to be top loaded into vacuum. The second, with a higher base temperature of 35 mK, allows samples to be top loaded into a container containing superfluid helium-4