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Experimental studies of a high power, X-band, coaxial gyroklystron

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9 Author(s)
Cheng, J. ; Naval Undersea Warefare Center, Newport, RI, USA ; Xiaoxi Xu ; Lawson, W.J. ; Calame, J.P.
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Gyroklystrons are possible candidates for the RF sources in future linear colliders. A two-cavity and a three-cavity X-band gyroklystrons have been designed, built, and tested on the new 100 MW test bed at the University of Maryland. The theoretical design of the three-cavity X-band gyroklystron called for a peak power of 96 MW at an efficiency near 40% at a frequency of 8.568 GHz. In experiments, peak output power in the range of 75-85 MW at a frequency of 8.6 GHz has been measured with the three-cavity gyroklystron tube. The three-cavity tube was operated at electron beam voltage and current of 470 kV and 500 A, respectively. The efficiency is approximately 32% and the gain is approximately 30 dB. The pulse width of the output power signal is 1.7 μs (full width at half maximum), while the pulse repetition rate was limited to 2 Hz in the proof-of-principle study. The paper details the design, performance, and diagnostics of these two X-band gyroklystrons operating at the fundamental cyclotron resonance

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Plasma Science, IEEE Transactions on  (Volume:27 ,  Issue: 4 )