TY - GEN
T1 - Accommodation of Pulsed Field Gradients with Cascade Field Regulation in Powered Magnets
AU - McPheron, Benjamin D.
AU - Schiano, Jeffrey L.
AU - Litvak, Ilya M.
AU - Brey, William W.
N1 - Funding Information:
VI. ACKNOWLEDGEMENTS This work was supported by the US National Science Foundation and the state of Florida through NSF Cooperative Agreement DMR-0654118. This work was also supported in part by NSF Grants DMR-0603042 and DMR-1039938, and by NIH/NIGMS Grant P41 GM122698. The authors are grateful for developments on the field estimation and regulation system by Brian F. Thomson and Kiran K. Shetty. We also thank Mark D. Bird, Timothy A. Cross, Samuel C. Grant, James A. Powell, Peter L. Gor’kov, Zhehong Gan, Jason Kitchen and many others at the NHMFL who have contributed to the development of high resolution NMR in powered magnets.
Publisher Copyright:
© 2021 IEEE.
PY - 2021
Y1 - 2021
N2 - High magnetic fields significantly improve the resolution and sensitivity of nuclear magnetic resonance (NMR) spectroscopy measurements, which presents exciting research opportunities in areas of chemistry, biology, and material science. Powered magnets can provide much higher magnetic fields than persistent mode superconducting magnets but suffer from temporal magnetic field fluctuations due to power supply ripple and variations in cooling water temperature and flow rate which make powered magnets non-viable for high resolution NMR experiments. Previous work has demonstrated that a multi-rate sampled data cascade control system may be used to improve the resolution of NMR experiments in powered magnets. Despite these advances in reducing temporal magnetic field fluctuations, the field regulation design does not accommodate the use of pulsed field gradients, which are necessary in many NMR experiments. This work presents a control topology which accommodates the use of pulsed field gradient signals with the field regulation system. This control approach is verified using NMR measurements.
AB - High magnetic fields significantly improve the resolution and sensitivity of nuclear magnetic resonance (NMR) spectroscopy measurements, which presents exciting research opportunities in areas of chemistry, biology, and material science. Powered magnets can provide much higher magnetic fields than persistent mode superconducting magnets but suffer from temporal magnetic field fluctuations due to power supply ripple and variations in cooling water temperature and flow rate which make powered magnets non-viable for high resolution NMR experiments. Previous work has demonstrated that a multi-rate sampled data cascade control system may be used to improve the resolution of NMR experiments in powered magnets. Despite these advances in reducing temporal magnetic field fluctuations, the field regulation design does not accommodate the use of pulsed field gradients, which are necessary in many NMR experiments. This work presents a control topology which accommodates the use of pulsed field gradient signals with the field regulation system. This control approach is verified using NMR measurements.
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U2 - 10.1109/CDC45484.2021.9683312
DO - 10.1109/CDC45484.2021.9683312
M3 - Conference contribution
AN - SCOPUS:85126010651
T3 - Proceedings of the IEEE Conference on Decision and Control
SP - 611
EP - 616
BT - 60th IEEE Conference on Decision and Control, CDC 2021
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 60th IEEE Conference on Decision and Control, CDC 2021
Y2 - 13 December 2021 through 17 December 2021
ER -