Design and operation of a 40-MW, highly stabilized power supply

Boenig, H.J.; Ferner, J.A.; Bogdan, F.; Rumrill, R.S.; Morris, G.C.

doi:10.1109/28.536877

Cited by 16 publications

(1 citation statement)

References 3 publications

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“…10 Figure 2 contains a block diagram of the power supply, with details presented in the figure caption. We monitored the noise level of the power supply by both ac magnetic field pickup and NMR measurements.…”

Section: Power Supplymentioning

confidence: 99%

Identification and minimization of sources of temporal instabilities in high field (>23 T) resistive magnets

Soghomonian

Sabo

Powell

et al. 2000

Review of Scientific Instruments

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Resistive magnets offer very high field strengths, unmatched by superconducting technology. However, the spatial and temporal characteristics of raw magnetic fields generated by resistive high powered and water cooled magnets, are unadapted to most nuclear magnetic resonance ͑NMR͒ experiments. The National High Magnetic Field Laboratory has installed a 24 T (ϳ1 GHz 1 H), 32 mm bore, 13 MW resistive magnet to study the feasibility of utilizing such fields for NMR applications. Herein we present our efforts in identifying, characterizing, and improving the temporal properties of the magnets. The temporal instabilities arise mainly from two sources: power supply ripple and inlet cooling water temperature variations. To compensate for power supply ripple, flux stabilization was employed, whereas for long term variations, arising from variations in the water temperature, a field frequency lock unit was utilized. Moreover, a novel flow based water temperature control scheme was implemented. The stabilization and improved control reduced the initial 16 ppm peak-to-peak variation to ϳ2 ppm. Implementation of a field frequency lock unit further reduced the temporal variation to 0.8 ppm peak-to-peak. Sharp NMR linewidths -1.7 ppm at full width at half height of 2 H in liquid D 2 O -are observed in small volume samples, enabling moderate resolution NMR experiments to be performed at 24 T.

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Section: Power Supplymentioning

confidence: 99%

Identification and minimization of sources of temporal instabilities in high field (>23 T) resistive magnets

Soghomonian

Sabo

Powell

et al. 2000

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control

Li¹,

Schiano²,

Samra³

et al. 2011

Journal of Magnetic Resonance

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Precision current regulator for NMR electromagnets

Conradi

Fabich

2020

Journal of Magnetic Resonance

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Design and operation of a 40-MW, highly stabilized power supply

Cited by 16 publications

References 3 publications

Identification and minimization of sources of temporal instabilities in high field (>23 T) resistive magnets

Identification and minimization of sources of temporal instabilities in high field (>23 T) resistive magnets

Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control

Precision current regulator for NMR electromagnets

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Design and operation of a 40-MW, highly stabilized power supply

Cited by 16 publications

References 3 publications

Identification and minimization of sources of temporal instabilities in high field (&gt;23 T) resistive magnets

Identification and minimization of sources of temporal instabilities in high field (&gt;23 T) resistive magnets

Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control

Precision current regulator for NMR electromagnets

Contact Info

Product

Resources

About

Identification and minimization of sources of temporal instabilities in high field (>23 T) resistive magnets

Identification and minimization of sources of temporal instabilities in high field (>23 T) resistive magnets