Patent ID: 7288939
Filing Date: 2007-10-30
Classification: G01R

Abstract:
1. A method for improved thermal control of a cryogenic NMR probe subject to thermal excursions from RF power dissipation, comprising the steps of: a) evacuating the interior of the housing of said NMR probe; b) cooling a heat exchanger of the cold head of the NMR probe to a temperature T c) continuously sensing the temperature of said cold head whereby said temperature varies over a range from T d) providing a selected quantity of heat to a heater in response to said step of sensing, wherein said selected quantity of heat raises the temperature of said cold head to the selected operating temperature thereof; and e) transferring said selected quantity of heat by conduction from said heater to said cold head to effect said rise of temperature, whereby improved temperature control produces improved stability of magnetic susceptibility of said coldhead.