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Bipolar programmable current supply for superconducting nuclear magnetic resonance magnets

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Koivuniemi, Jaakko
dc.contributor.author Luusalo, Reeta
dc.contributor.author Hakonen, Pertti J.
dc.date.accessioned 2015-09-15T09:01:55Z
dc.date.available 2015-09-15T09:01:55Z
dc.date.issued 1998
dc.identifier.citation Koivuniemi, Jaakko & Luusalo, Reeta & Hakonen, Pertti J. 1998. Bipolar programmable current supply for superconducting nuclear magnetic resonance magnets. Review of Scientific Instruments. Volume 69, Issue 9. 3418-3425. ISSN 0034-6748 (printed). DOI: 10.1063/1.1149109 en
dc.identifier.issn 0034-6748 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/17667
dc.description.abstract In high resolution continuous-wave nuclear magnetic resonance(NMR) work well-reproducible, linear sweeps of current are needed. We have developed a microcontroller based programmable current supply, tested with superconducting magnets with inductance of 10 mH and 10 H. We achieved a resolution and noise of 4 ppm. The supply has an internal sweep with programmable ramping rate and a possibility for remote operation from a computer with either GPIB or RS232 interface. It is based on an 18-bit D/A converter. The maximum output current is ±10 A, the sweep rate can be set between 1 μA/s–140 mA/s, and the maximum output voltage is ±2.5 V. In work at ultralow temperatures, especially in superconducting quantum interference device NMR, all rf interference to the experiment should be avoided. One of the sources of this kind of unwanted input is the digital switching noise of fast logic devices. We discuss this problem in the context of our design. en
dc.format.extent 3418-3425
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher AIP Publishing en
dc.relation.ispartofseries Review of Scientific Instruments en
dc.relation.ispartofseries Volume 69, Issue 9
dc.rights © 1998 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in Review of Scientific Instruments, Volume 69, Issue 9 and may be found at http://scitation.aip.org/content/aip/journal/rsi/69/9/10.1063/1.1149109. en
dc.subject.other Physics en
dc.title Bipolar programmable current supply for superconducting nuclear magnetic resonance magnets en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder AIP Publishing
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword superconductors en
dc.subject.keyword NMR en
dc.subject.keyword superconducting magnets en
dc.identifier.urn URN:NBN:fi:aalto-201509144272
dc.type.dcmitype text en
dc.identifier.doi 10.1063/1.1149109
dc.type.version Final published version en

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