Continuously Tunable 250 GHz Gyrotron with a Double Disk Window for DNP-NMR Spectroscopy
Author(s)Ni, Qing Zhe; Barnes, Alexander; Daviso, Eugenio; Herzfeld, Judith; Griffin, Robert Guy; Guss, William C; Jawla, Sudheer K.; Temkin, Richard J; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center; Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
Journal of Infrared, Millimeter and Terahertz Waves
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.
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