Figure 3. Illustration of the remote hyperpolarization set-up.
(a) The DNP polarizer consists of a 6.7-T wide bore magnet and a 1.2-K cryostat equipped with (b) a DNP probe where the sample is inserted and irradiated with microwaves for 1H DNP and radio-frequency fields for 1H–13C cross-polarization. The sample can then be manually removed from the polarizer in (c) a transfer stick comprising a coil sustaining a magnetic field of ca. 40 mT (100 turns, current of 4 A) and subsequently inserted in (d) a conventional liquid helium transport Dewar with (e) a magnetic insert providing a 1.0 T static magnetic field for storage or transport.