Many state-of-the-art fundamental and industrial projects need the use of terahertz radiation with high power and small linewidth. Gyrotrons as radiation sources provide the desired level of power in the sub-THz and THz frequency range, but have substantial free-running frequency fluctuations of the order of 10(-4). Here, we demonstrate that the precise frequency stability of a high-power sub-THz gyrotron can be achieved by a phase-lock loop in the anode voltage control. The relative width of the frequency spectrum and the frequency stability obtained for a 0.263 THz/100 W gyrotron are 4 x 10(-12) and 10(-10), respectively, and these parameters are better than those demonstrated so far with high-power sources by almost three orders of magnitude. This approach confirms its potential for ultra-high precision spectroscopy, the development of sources with large-scale radiating apertures, and other new projects.
High-Frequency Dynamic Nuclear Polarization NMR for Solids: Part 1 – An Introduction #DNPNMR
From The DNP-NMR Blog:
High-Frequency Dynamic Nuclear Polarization NMR for Solids: Part 1 – An Introduction #DNPNMR
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Ha, M. and V.K. Michaelis, High-Frequency Dynamic Nuclear Polarization NMR for Solids: Part 1 – An Introduction, in Modern Magnetic Resonance, G.A. Webb, Editor. 2017, Springer International Publishing: Cham. p. 1-24.
https://doi.org/10.1007/978-3-319-28275-6_140-1
Frequency-Swept Integrated Solid Effect #DNPNMR
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Frequency-Swept Integrated Solid Effect #DNPNMR
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Can, T.V., et al., Frequency-Swept Integrated Solid Effect. Angew Chem Int Ed Engl, 2017. 56(24): p. 6744-6748.
https://www.ncbi.nlm.nih.gov/pubmed/28497528
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08-25-2017 05:31 PM
Gyrotrons for High-Power Terahertz Science and Technology at FIR UF #DNPNMR
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Gyrotrons for High-Power Terahertz Science and Technology at FIR UF #DNPNMR
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Idehara, T. and S.P. Sabchevski, Gyrotrons for High-Power Terahertz Science and Technology at FIR UF. J Infrared Milli Terahz Waves, 2016: p. 1-25.
http://dx.doi.org/10.1007/s10762-016-0314-5
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11-19-2016 08:35 PM
[NMR paper] Cavity as a Source of Conformational Fluctuation and High-Energy State: High-Pressure NMR Study of a Cavity-Enlarged Mutant of T4Lysozyme.
Cavity as a Source of Conformational Fluctuation and High-Energy State: High-Pressure NMR Study of a Cavity-Enlarged Mutant of T4Lysozyme.
Cavity as a Source of Conformational Fluctuation and High-Energy State: High-Pressure NMR Study of a Cavity-Enlarged Mutant of T4Lysozyme.
Biophys J. 2015 Jan 6;108(1):133-145
Authors: Maeno A, Sindhikara D, Hirata F, Otten R, Dahlquist FW, Yokoyama S, Akasaka K, Mulder FA, Kitahara R
Abstract
Although the structure, function, conformational dynamics, and controlled thermodynamics of proteins...
High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region
From The DNP-NMR Blog:
High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region
He, W., et al., High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region. Phys. Rev. Lett., 2013. 110(16): p. 165101.
http://www.ncbi.nlm.nih.gov/pubmed/23679610
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05-29-2013 09:08 PM
High power THz technologies using high frequency gyrotrons
From the The DNP-NMR Blog:
High power THz technologies using high frequency gyrotrons
Idehara, T., et al. High power THz technologies using high frequency gyrotrons. in Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2012 37th International Conference on. 2012.
http://dx.doi.org/10.1109/IRMMW-THz.2012.6380408
High-power sub-terahertz source with a record frequency stability at up to 1 Hz #DNPNMR
Linear Mode
