NMR MAS probe with cryogenically cooled critical circuit...

Details NMR MAS probe with cryogenically cooled critical circuit... NMR MAS probe with cryogenically cooled critical circuit...

2006-12-19

2006-12-19

Shrivastav, Brij (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

Reexamination Certificate

active

07151374

ABSTRACT:
A MAS probe offers a substantial improvement in signal to noise (S/N) in triple-resonance high-resolution (HR) magic-angle-spinning (MAS) NMR of samples near room temperature (RT) in high field magnets, especially where the RT shim bore is less than 55 mm. Critical circuit components other than the sample coils, including both high-power capacitors and inductors for one or more channels are located in a small, thermally insulated, cold zone immediately below the sample spinner assembly. Cooling these components to 100 K allows their thermal noise power to be conveniently reduced by a factor of three or more. Variable capacitors for fine tuning are located in an RT tuning zone below the cold zone. The circuit is designed such that the currents, voltages, and standing wave ratio (SWR) in circuit tuning elements in the RT tuning zone are relatively low, so rf losses and noise contributions below the cold zone may be only a few percent. The MAS probe is also compatible with magic angle gradients, automatic sample change, multi-nuclear tuning, variable temperature operation, field locking, and optical spin rate detection.

REFERENCES:
patent: 4940942 (1990-07-01), Bartuska et al.
patent: 5424645 (1995-06-01), Doty
patent: 5508613 (1996-04-01), Kotsubo et al.
patent: 5585723 (1996-12-01), Withers
patent: 5872452 (1999-02-01), Cory et al.
patent: 6130537 (2000-10-01), Doty et al.
patent: 6320384 (2001-11-01), Doty et al.
patent: 6677751 (2004-01-01), Marek et al.
patent: 6686741 (2004-02-01), Hasegawa
patent: 6828791 (2004-12-01), Morita et al.
patent: 6937020 (2005-08-01), Munson et al.
patent: 7081753 (2006-07-01), Mullen et al.
patent: 2006/0176056 (2006-08-01), Doty et al.
Barbara et al., Target Field Design for Magic Angle Gradient Coils, Journal of magnetic Resonance, 1999, pp. 285-288, vol. 140.
Doty, Probe Design & Construction, 1995, pp. 3753-3762.
Doty et al., Magnetism in High-Resolution NMR Probe Design. II: HR MAS, Concepts in Magnetic Resonance, 1998, pp. 239-260, vol. 10, No. 4.
Doty et al., Reducing Decoupler Heating of Lossy Samples in Triple-Resonance MAS probes at 750 MHz, 45th ENC—Asilomar, 2004.
Martin et al., Design of a triple resonance magic angle sample spinning probe for high field solid state nuclear magnetic resonance, Review of Scientific Instruments, 2003, pp. 3045-3061, vol. 74, No. 6.
Paulson et al., Cross polarization, radio frequency field homogeneity, and circuit balancing in high field solid state NMR probes, Journal of Magnetic Resonance, 2004, pp. 314-323, vol. 171.

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