Varian, Inc.

Agilent Technologies, Inc.

John Stringer

Knut G Mehr

Charles Glen Mullen

Charles E Bronnimann

Charles Bronniman

A rotor drive apparatus includes a rotor and a stator. The stator has a gas injection orifice located on the axis about which the rotor spins. The gas injection orifice communicates with a bearing gap formed between a tapered surface of the rotor and an axially spaced tapered surface of the stator. A gas is flowed from the gas injection orifice through the bearing gap, thereby establishing a center-fed, radial-outflow gas bearing supporting the rotor during rotation. In one implementation, a separate flow of drive gas is fed to drive flutes of the rotor to drive rotation. In another implementation, the center-fed, radial-outflow gas flow is additionally utilized to impinge against the drive flutes to actuate the rotation.

Rotor drive apparatus and methods utilizing center-fed radial-outflow gas

A sample probe and apparatus are provided for magnetic resonance experiments. The probe includes a coil simultaneously tunable to at least two different frequencies. The coil includes a section having a scroll configuration and defines a core into which a sample can be inserted. A multi-resonant circuit transmits RF energy to the coil at two or more different frequencies for exciting nuclei of the sample. The apparatus includes a coil having a scroll configuration. RF transmission circuitry transmits RF energy to the coil at two or more different frequencies. RF receiving circuitry receives an RF signal responsive to excitation. A coil is magnetically coupled with a sample at an RF frequency.

Multiple tuned scroll coil

An NMR probe, lacking electrical balance in respect of the RF coil thereof, includes a conducting shield of axial extent greater than &lgr;/4 from the ground plane closure of said shield of the probe (&lgr; being the highest resonant frequency of interest), the components of the probe other than the coil being confined to the axial region less than &lgr;/4 from the ground plane and spaced apart from the shield.

Growing community of inventors

Longmont, CO, United States of America

John Stringer