NMR probe for efficient MAS-DNP operation at ultra-low temperatures
US12332329B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 2024 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Aug 22, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/282
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NMR probe for insertion into an NMR magnet from below is disclosed that includes multiple counterflow heat exchangers to enable a wide range of NMR methods at ultra low temperatures, including MAS DNP at temperatures below 15 K. Coolant fluid is ducted from the bottom of the probe through a vacuum insulated transfer line up into the probehead, the region containing the sample and sample coil, where it splits into first and second coolant streams for cooling first and second spin-gas streams, each through a cold counterflow exchanger and at least one cool counterflow exchanger contained within the probe.The cold exchangers would each preferably comprise two straight continuously joined tubes inside a dewared tube that extends from a vacuum chamber in the base of the probe up into the probehead. These cold exchangers are denoted as Dual Inner Tube Exchangers (DITEs). The cool exchanger is preferably a coil of two parallel continuously thermally joined tubes, and it is denoted as a Parallel Tube Recuperator (PTR).The first coolant-stream in the probehead feeds into the top of DITE-1, through which the first coolant stream flows downward, providing final cooling to the first spin ga…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.