Patent ID: 7282919
Filing Date: 2007-10-16
Classification: G01R

Abstract:
1. An NMR MAS probe for NMR investigations of a sample inside a rotor near room temperature in a magnet having static field B 0 greater than 4 T, said probe comprising a sealed, thermally insulated, cold zone external to said rotor, an MAS spinner assembly with at least one rf sample coil surrounding said sample in said cold zone, said assembly connected to a curved rotor-loading tube sealed from said cold zone, a thermally conductive second-stage cold plate inside said cold zone, a cold-finger dewar for accepting and insulating a sealed cold finger for cooling said second-stage cold plate, a tuning zone near room temperature and separated from said cold zone by a gas-sealing barrier, a first-stage cool plate cooled with cryogenic fluid to a temperature greater than that of said second-stage cold plate between said cold plate and said barrier, rf feed-through elements through said gas-sealing barrier, and a cooling jacket, cooled with cryogenic fluid, inside said cold zone and surrounding at least a portion of said spinner assembly, said cold zone further characterized as containing a plurality of additional high voltage rf reactive elements in addition to said sample coil, at least one of said additional reactive elements providing thermal contact between said sample coil and said second-stage cold plate.