International Journal of Terahertz Science and Technology
  TST >> Vol.9, No.4, December 2016: PP. 117-186

(Invited paper) Development of high-frequency cw gyrotrons for DNP/NMR applications

Monica Blank 1*, Philipp Borchard 1, Stephen Cauffman 1, Kevin Felch 1, Melanie Rosay 2 , and Leo Tometich 2
1 Communications and Power Industries, 811 Hansen Way, Palo Alto, CA 94304, USA
2 Bruker-Biospin, 15 Fortune Drive, Billerica, MA 01730, USA
*1 Email:

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Abstract: Dynamic nuclear polarization (DNP) enhanced nuclear magnetic resonance (NMR) spectroscopy is an emerging and growing application for high-frequency, continuous-wave (cw) gyrotrons. For DNP, gyrotrons capable of producing tens to hundreds of watts at millimeter-wave and terahertz frequencies are required. As an original equipment manufacturer of gyrotrons for Bruker Biospin DNP/NMR spectrometers, CPI has developed cw gyrotrons at 263GHz, 395GHz, and 527GHz, all of which are capable of producing at least 50 W output power. The gyrotrons at all three frequencies operate at the second harmonic of the cyclotron frequency and produce high-quality Gaussian output beams suitable for transmission in corrugated waveguides. To date, 30 Bruker DNP/NMR systems using CPI gyrotrons have been installed around the world. Key features of the gyrotrons, as well as the results of experimental demonstrations, are presented.

Keywords: gyrotron, millimeter wave, terahertz, DNP, NMR spectroscopy

Received: 2016-12-22

Published: 2016-12-31

Cite this article:
Monica Blank, Philipp Borchard, Stephen Cauffman, Kevin Felch, Melanie Rosay, and Leo Tometich (Invited paper) Development of high-frequency cw gyrotrons for DNP/NMR applications[J]. International Journal of Terahertz Science and Technology, 2016, Vol.9, No.4: 177-186.  10.11906/TST.177-186.2016.12.17




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