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This thesis project presents a novel method of 3D printing with the ﬂuoroplastic Kel-F (PCTFE) as an alternative to traditional machining and demonstrates its use in creating target cups for dynamic nuclear polarization (DNP) experiments. Kel-F is used by the UNH Nuclear Physics Group in its tensor-polarized target project because the material has several properties that make it well-suited to this purpose: transparency to millimeter-waves, plasticity at cryogenic temperatures, and the absence of any unpaired protons that would add an unwanted background to the NMR signal used to measure nucleon polarization. As this paper shows, these properties are not signiﬁcantly altered by the printing process, validating the use of 3D-printed Kel-F components in a DNP system. This paper also explores the possibility of using 3D printing to create mm-wave Kel-F lenses to be implemented into a DNP target system and presents the results of ﬁve such lenses using a 140 GHz Gaussian beam source and custom mm-wave imaging equipment. The results show that Kel-F lenses can be used to redistribute a mm-wave beam, but often at considerable power loss. These results highlight some of the design challenges to be overcome before such lenses will be eﬀective at enhancing nucleon polarization.
McGuire, Kellie, "Designing and 3D Printing mm-Wave Lenses Using Kel-F for Use in Dynamic Nuclear Polarization" (2019). Honors Theses and Capstones. 477.