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- Bratman, V. L., et al.
(författare)
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Low-Voltage gyrotron for DNP applications : Project and features
- 2017
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Ingår i: 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). - : IEEE Computer Society.
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Konferensbidrag (refereegranskat)abstract
- A possibility of gyrotron operation at a very low voltage, 1.5-2 kV, is considered in the context of dynamic nuclear polarization (DNP) application. Simulations predict that a low-voltage device has some specific but useful features like efficiency operation at high axial modes and capability of wide-band frequency tuning.
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3. |
- Bratman, V. L., et al.
(författare)
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Numerical Study of a Low-Voltage Gyrotron ("Gyrotrino") for DNP/NMR Spectroscopy
- 2017
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Ingår i: IEEE Transactions on Plasma Science. - : IEEE. - 0093-3813 .- 1939-9375. ; 45:4, s. 644-648
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Tidskriftsartikel (refereegranskat)abstract
- Feasibility of a gyrotron for the dynamic nuclear polarization (DNP) purpose, integrated with nuclear magnetic resonance (NMR) spectrometer inside a single cryomagnet, is analyzed on the basis of numerical simulations. The necessary condition for DNP is matching of the gyrotrino and DNP frequencies. This imposes a strong restriction on the gyrotron operating voltage, which should be less than 2 kV. The most part of the uniform magnetic field region in the cryomagnet is occupied by a sample with NMR probe, so there is a very limited space for the gyrotron cavity. This dictates a number of peculiarities for the gyrotrino design, in particular, the diffraction power output from the cathode end of the cavity and collecting of a thin electron beam in a strong magnetic field. According to simulations, the gyrotrino operating at the fundamental cyclotron resonance with a voltage of 1.5 kV can provide an output power of 10-20 W at a frequency of 264 GHz, which is suitable for many NMR-DNP experiments.
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