Speaker
Description
The University of New Hampshire polarized target lab uses dynamic nuclear polarization to achieve high tensor polarization in solid deuterated target material, such as ND3 and deuterated alcohols. This system is comprised by a number of subsystems including a 1 K liquid helium refrigerator, a solid state microwave emitter, and a superconducting magnet. To mount the target material inside the uniform field region of the magnet we use a target insert which we design and assemble at UNH. The insert is placed from the top of a cryostat from above, down into the uniform field region. At the bottom of the target insert we mount a target ladder, which we design at UNH and 3D print using a resin plastic which can withstand 1 K temperatures. Inside the target cup we wrap a coil of wire to be used for a NMR measurements on the target sample. The target ladder also has an ss-RF coil for hole burning as well as an EPR coil for measurements of a sample's polarizability. Additionally the target ladder holds a thermometry, placed both above and below the target sample. Finally, the target insert must be engineered such that it is sufficiently vacuum-tight for a polarization operations, but still removable to swap out different materials. The target insert is used in concert with a NMR analyzer system, which can be used to extract the deuteron lineshape and from that a target polarization.
