光子带隙行波回旋管放大器。
Photonic-band-gap traveling-wave gyrotron amplifier.
机构信息
Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Department of Chemistry and the Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
出版信息
Phys Rev Lett. 2013 Dec 6;111(23):235101. doi: 10.1103/PhysRevLett.111.235101.
We report the experimental demonstration of a gyrotron traveling-wave-tube amplifier at 250 GHz that uses a photonic band gap (PBG) interaction circuit. The gyrotron amplifier achieved a peak small signal gain of 38 dB and 45 W output power at 247.7 GHz with an instantaneous -3 dB bandwidth of 0.4 GHz. The amplifier can be tuned for operation from 245-256 GHz. The widest instantaneous -3 dB bandwidth of 4.5 GHz centered at 253.25 GHz was observed with a gain of 24 dB. The PBG circuit provides stability from oscillations by supporting the propagation of transverse electric (TE) modes in a narrow range of frequencies, allowing for the confinement of the operating TE03-like mode while rejecting the excitation of oscillations at nearby frequencies. This experiment achieved the highest frequency of operation for a gyrotron amplifier; at present, there are no other amplifiers in this frequency range that are capable of producing either high gain or high output power. This result represents the highest gain observed above 94 GHz and the highest output power achieved above 140 GHz by any conventional-voltage vacuum electron device based amplifier.
我们报告了在 250GHz 下使用光子带隙（PBG）互作用电路的回旋行波管放大器的实验演示。该回旋管放大器在 247.7GHz 时实现了 38dB 的峰值小信号增益和 45W 的输出功率，瞬时-3dB 带宽为 0.4GHz。该放大器可在 245-256GHz 范围内调谐工作。在 253.25GHz 处观察到 4.5GHz 的最宽瞬时-3dB 带宽，增益为 24dB。PBG 电路通过支持横向电场（TE）模式在窄频带内的传播来提供稳定性，允许限制工作 TE03 类似模式的传播，同时抑制附近频率的振荡激励。该实验实现了回旋管放大器的最高工作频率；目前，在该频率范围内，没有其他放大器能够同时产生高增益或高输出功率。这一结果代表了基于常规电压真空电子器件的放大器在 94GHz 以上观察到的最高增益和在 140GHz 以上实现的最高输出功率。
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