Photonic-band-gap gyrotron amplifier with picosecond pulses
Photonic-band-gap gyrotron amplifier with picosecond pulses
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DOI：
10.1063/1.5006348
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发表时间：
2017-12-04
影响因子：
4
通讯作者：
Temkin, Richard J.
中科院分区：
文献类型：
--
作者：
Nanni, Emilio A.;Jawla, Sudheer;Temkin, Richard J.
我们报道了用光子带隙回旋行波放大器放大250 GHz的短脉冲至260 ps，而没有观察到脉冲展宽。回旋管放大器的器件增益为38 dB，瞬时带宽为8 GHz。通过调节电子束的工作电压和磁场，放大器的工作带宽可以达到16 GHz以上。该放大器使用30 cm长的光子带隙相互作用电路来限制所需的TE 03类工作模式，同时抑制可能导致不希望的振荡的低阶模式。在束流电压为23 kV、束流电流为700 mA时，电路增益>55 dB。这些结果表明，宽带宽和高增益可实现的回旋管放大器。利用耦合色散关系和准连续波输入脉冲测量的放大器增益谱，对260-800 ps的皮秒脉冲进行了放大，结果与理论吻合较好。出版社：AIP Publishing
We report the amplification of 250GHz pulses as short as 260 ps without observation of pulse broadening using a photonic-band-gap circuit gyrotron traveling-wave-amplifier. The gyrotron amplifier operates with a device gain of 38 dB and an instantaneous bandwidth of 8GHz. The operational bandwidth of the amplifier can be tuned over 16GHz by adjusting the operating voltage of the electron beam and the magnetic field. The amplifier uses a 30cm long photonic-band-gap interaction circuit to confine the desired TE03-like operating mode while suppressing lower order modes which can result in undesired oscillations. The circuit gain is >55 dB for a beam voltage of 23 kV and a current of 700mA. These results demonstrate the wide bandwidths and a high gain achievable with gyrotron amplifiers. The amplification of picosecond pulses of variable lengths, 260-800 ps, shows good agreement with the theory using the coupled dispersion relation and the gain-spectrum of the amplifier as measured with quasi-CW input pulses. Published by AIP Publishing.