Continuously Tunable 250 GHz Gyrotron with a Double Disk Window for DNP-NMR Spectroscopy

Author(s)
Ni, Qing Zhe; Barnes, Alexander; Guss, William; Daviso, Eugenio; Herzfeld, Judith; ... Show more
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Abstract
In this paper, we describe the design and experimental results from the rebuild of a 250 GHz gyrotron used for Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance spectroscopy on a 380 MHz spectrometer. Tuning bandwidth of approximately 2 GHz is easily achieved at a fixed magnetic field of 9.24 T and a beam current of 95 mA producing an average output power of >10 W over the entire tuning band. This tube incorporates a double disk output sapphire window in order to maximize the transmission at 250.58 GHz. DNP Signal enhancement of >125 is achieved on a [superscript 13]C-Urea sample using this gyrotron.
Date issued
2012-11
URI
http://hdl.handle.net/1721.1/94600
Department
Francis Bitter National Magnet Laboratory; Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Journal of Infrared, Millimeter and Terahertz Waves
Publisher
Springer-Verlag
Citation
Jawla, Sudheer, Qing Zhe Ni, Alexander Barnes, William Guss, Eugenio Daviso, Judith Herzfeld, Robert Griffin, and Richard Temkin. “Continuously Tunable 250 GHz Gyrotron with a Double Disk Window for DNP-NMR Spectroscopy.” J Infrared Milli Terahz Waves 34, no. 1 (November 15, 2012): 42–52.
Version: Author's final manuscript
ISSN
1866-6892
1866-6906
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