{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Litvak IM"],"funding":["National Science Foundation Cooperative","National High Magnetic Field Laboratory","NIGMS NIH HHS"],"pagination":["109-118"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC6474693"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["301"],"pubmed_abstract":["Powered resistive and resistive-superconductive hybrid magnets can reach fields higher than superconducting NMR magnets but lack the field homogeneity and temporal stability needed for high resolution NMR. Due to field fluctuations in powered magnets, commercially available mapping systems fail to produce maps of these magnets with sufficient reproducibility, thus hampering attempts to improve homogeneity of the field they generate. Starting with a commercial mapper, we built a mapping system which uses a two-channel (measurement + reference) mapper probe. We used this system to map and then to shim two magnets of Florida Bitter type at the National High Magnetic Field Laboratory in Tallahassee, FL. With a combination of passive (ferromagnetic) and active shims we achieved 2.3 ppm homogene"],"journal":["Journal of magnetic resonance (San Diego, Calif. : 1997)"],"pubmed_title":["Achieving 1 ppm field homogeneity above 24 T: Application of differential mapping for shimming Keck and the Series Connected Hybrid magnets at the NHMFL."],"pmcid":["PMC6474693"],"funding_grant_id":["P41 GM122698","DMR-0603042","DMR-1157490"],"pubmed_authors":["Brey WW","Litvak IM","Griffin A","Paulino J","Mao W","Shetty KK","Gor'kov P"],"additional_accession":[]},"is_claimable":false,"name":"Achieving 1 ppm field homogeneity above 24 T: Application of differential mapping for shimming Keck and the Series Connected Hybrid magnets at the NHMFL.","description":"Powered resistive and resistive-superconductive hybrid magnets can reach fields higher than superconducting NMR magnets but lack the field homogeneity and temporal stability needed for high resolution NMR. Due to field fluctuations in powered magnets, commercially available mapping systems fail to produce maps of these magnets with sufficient reproducibility, thus hampering attempts to improve homogeneity of the field they generate. Starting with a commercial mapper, we built a mapping system which uses a two-channel (measurement + reference) mapper probe. We used this system to map and then to shim two magnets of Florida Bitter type at the National High Magnetic Field Laboratory in Tallahassee, FL. With a combination of passive (ferromagnetic) and active shims we achieved 2.3 ppm homogene","dates":{"release":"2019-01-01T00:00:00Z","publication":"2019 Apr","modification":"2025-04-26T21:55:30.852Z","creation":"2020-05-22T14:49:50Z"},"accession":"S-EPMC6474693","cross_references":{"pubmed":["30870670"],"doi":["10.1016/j.jmr.2019.03.002"]}}