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A gyrotron amplifier that uses a novel photonic band gap (PBG) interaction circuit has achieved a peak small signal gain of 38 dB at 247.7 GHz, 32 kV and 0.35 A. The instantaneous −3 dB bandwidth of the amplifier at peak gain is 0.4 GHz. A peak output power of 45 W has been measured. The output power is not saturated but is limited by the 7.5 mW of available input power; the saturated output power...
The design of a 250 GHz gyro-TWT for nanosecond pulse amplification with gain exceeding 50 dB is presented. The amplifier uses a novel PBG interaction circuit that confines a TE03-like mode while providing lower-order mode suppression. Ongoing experimental installation and cold test results for the photonic structure will be discussed.
High power millimeter wave and terahertz sources are used in DNP/NMR spectroscopy to greatly enhance the NMR signal. A key issue is the efficient coupling of the source power to the sample. We present HFSS calculations showing that the MIT 250 GHz DNP/NMR system provides a B1 value of 13 μT/W1/2. The simulation shows the importance of the diffraction of radiation passing through the RF coil, leading...
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