Journal Article

FZJ-2014-06223

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High-sensitivity cooled coil system for nuclear magnetic resonance in kHz range

Lin, T. ; Zhang, Y.FZJ* ; Lee, Y.-H. ; Krause, H.-J.FZJ* ; Lin, J. ; Zhao, J. (Corresponding Author)

2014
American Institute of Physics [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/16749  doi:10.1063/1.4901964

Abstract: In several low-field Nuclear Magnetic Resonance (LF-NMR) and surface nuclear magnetic resonance applications, i.e., in the frequency range of kHz, high sensitivity magnetic field detectors are needed. Usually, low-T c superconducting quantum interference devices (SQUIDs) with a high field sensitivity of about 1 fT/Hz1/2 are employed as detectors. Considering the flux trapping and operational difficulties associated with low-T c SQUIDs, we designed and fabricated liquid-nitrogen-cooled Cu coils for NMR detection in the kHz range. A cooled coil system consisting of a 9-cm diameter Cu coil and a low noise preamplifier was systematically investigated and reached a sensitivity of 2 fT/Hz1/2 at 77 K, which is 3 times better compared to the sensitivity at 300 K. A Q-switch circuit as an essential element for damping the ringing effects of the pickup coil was developed to acquire free induction decay signals of a water sample with minimum loss of signal. Our studies demonstrate that cooled Cu coils, if designed properly, can provide a comparable sensitivity to low-T c SQUIDs

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Contributing Institute(s):

1. Bioelektronik (PGI-8)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 423 - Sensorics and bioinspired systems (POF2-423) (POF2-423)

Appears in the scientific report 2014

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Database coverage:
; ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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