DNP Apparatus

A DNP (dynamic nuclear polarization) apparatus for performing a measurement on a sample, the apparatus comprising:

• at least one cryostat having an opening and a loading path for loading the cryostat with the sample, wherein said loading path extends from said opening to a sample receptacle at a location of the sample in said cryostat;
• a magnet coil disposed in said cryostat for generating a homogeneous magnetic field at said location of the sample during the measurement;
• a microwave source for generating microwave radiation;
• and
• a configuration for supplying said microwave radiation from said microwave source to the location of the sample, said configuration being disposed in said cryostat and comprising a microwave path extending directly to said location of the sample in said cryostat, wherein said microwave path extends spatially separately from said loading path, said configuration for supplying microwave radiation further comprising at least one microwave feed-through passing through one or more walls of said cryostat, wherein said microwave path is incident on said location of the sample from a direction opposite to said loading path or from a sideward location at right angles to or at an inclination with respect to an axis of said loading path.