Preprints
https://doi.org/10.5194/mr-2022-15
https://doi.org/10.5194/mr-2022-15
 
16 Aug 2022
16 Aug 2022
Status: a revised version of this preprint was accepted for the journal MR and is expected to appear here in due course.

Electroplated waveguides to enhance DNP and EPR spectra of silicon and diamond particles

Aaron Himmler1, Mohammed M. Albannay1,2, Gevin von Witte1,2, Sebastian Kozerke2, and Matthias Ernst1 Aaron Himmler et al.
  • 1ETH Zurich, Laboratory of Physical Chemistry, Zurich 8093, Switzerland
  • 2University and ETH Zurich, Institute for Biomedical Engineering, Zurich 8092, Switzerland

Abstract. Electroplating the waveguide of a 7 T polarizer in a simple innovative way increased microwave power delivered to the sample by 3.1 dB. Silicon particles, while interesting for hyperpolarized MRI applications, are challenging to polarize due to inefficient microwave multipliers at the electron Lamour frequency at high magnetic fields and fast electronic relaxation times. Improving microwave transmission directly translates to significantly higher EPR signal at high-field, low-temperature conditions and promises faster and higher 29Si polarization build-up through DNP.

Aaron Himmler et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2022-15', Kong Ooi Tan, 20 Aug 2022
    • CC1: 'Reply on RC1', Aaron Himmler, 22 Aug 2022
    • AC1: 'Reply on RC1', Matthias Ernst, 02 Sep 2022
  • RC2: 'Comment on mr-2022-15', Vasyl Denysenkov, 29 Aug 2022
    • AC2: 'Reply on RC2', Matthias Ernst, 02 Sep 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2022-15', Kong Ooi Tan, 20 Aug 2022
    • CC1: 'Reply on RC1', Aaron Himmler, 22 Aug 2022
    • AC1: 'Reply on RC1', Matthias Ernst, 02 Sep 2022
  • RC2: 'Comment on mr-2022-15', Vasyl Denysenkov, 29 Aug 2022
    • AC2: 'Reply on RC2', Matthias Ernst, 02 Sep 2022

Aaron Himmler et al.

Aaron Himmler et al.

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Short summary
Dynamic nuclear polarization requires a wave guide that connects the cold (1–10 K) sample space to the outside. To reduce the heating of the sample, the wave guide is produced from steel which has low thermal conductivity but attenuates the micro waves. Therefore, the inside of the wave guide should be plated with silver to reduce the electrical losses. We show a new simple way to electroplate such wave guides with a thin silver layer and show that this improves the experimental performance.