Faraday shields within a solenoidal coil to reduce sample heating: Numerical comparison of designs and experimental verification

Bu Sik Park, Thomas Neuberger, Andrew G. Webb, Don C. Bigler, Christopher M. Collins

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

A comparison of methods to decrease RF power dissipation and related heating in conductive samples using passive conductors surrounding a sample in a solenoid coil is presented. Full-Maxwell finite difference time domain numerical calculations were performed to evaluate the effect of the passive conductors by calculating conservative and magnetically-induced electric field and magnetic field distributions. To validate the simulation method, experimental measurements of temperature increase were conducted using a solenoidal coil (diameter 3 mm), a saline sample (10 mM NaCl) and passive copper shielding wires (50 μm diameter). The temperature increase was 58% lower with the copper wires present for several different input powers to the coil. This was in good agreement with simulation for the same geometry, which indicated 57% lower power dissipated in the sample with conductors present. Simulations indicate that some designs should be capable of reducing temperature increase by more than 85%.

Original languageEnglish (US)
Pages (from-to)72-77
Number of pages6
JournalJournal of Magnetic Resonance
Volume202
Issue number1
DOIs
StatePublished - Jan 2010

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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