Development of a Novel High Power Sub-THz Second Harmonic Gyrotron

Notake, T.; Saito, T.; Tatematsu, Y.; Fujii, Akihito; Ogasawara, Satoshi; Agusu, La; Ogawa, I.; Idehara, T.; Мануилов, В. Н.

doi:10.1103/physrevlett.103.225002

Cited by 84 publications

(33 citation statements)

References 21 publications

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“…Although outside the topic of this review paper, the development of high-power subterahertz pulse gyrotron for diagnostic of magnetically confined fusion plasmas based on Collective Thomson Scattering (CTS) is among the important topics that are studied at the FIR FU Center and should be mentioned [78][79][80]. Currently, the work is focused on the optimization of the design of a second harmonic gyrotron with a frequency around 400 GHz and output power approaching 100 kW [81].…”

Section: Bloch Oscillatormentioning

confidence: 99%

Development and Applications of High—Frequency Gyrotrons in FIR FU Covering the sub-THz to THz Range

Idehara

Sabchevski

2012

J Infrared Milli Terahz Waves

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Powerful sources of coherent radiation in the sub-terahertz and in the terahertz frequency range of the electromagnetic spectrum are necessary for a great and continuously expanding number of applications in the physical research and in various advanced technological processes as well as in radars, communication systems, for remote sensing and inspection etc.. In recent years, a spectacular progress in the development of various gyrodevices and in particular of the powerful high frequency (sub-terahertz and terahertz) gyrotron oscillators has demonstrated a remarkable potential for bridging the so-called terahertz power gap and stimulated many novel and prospective applications. In this review paper we outline two series of such devices, namely the Gyrotron FU Series which includes pulsed gyrotrons and Gyrotron FU CW Series which consist of tubes operated in a CW (continuous wave) or long pulse mode, both developed at the FIR FU Center. We present the most remarkable achievements of these devices and illustrate their applications by some characteristic examples. An outlook for the further extension of the Gyrotron FU CW Series is also provided.

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Section: Bloch Oscillatormentioning

confidence: 99%

Development and Applications of High—Frequency Gyrotrons in FIR FU Covering the sub-THz to THz Range

Idehara

Sabchevski

2012

J Infrared Milli Terahz Waves

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“…A more in depth discussion of these differences can be found in review papers, such as Refs. [11-13]. This experiment achieved the highest frequency of operation for a gyrotron amplifier.…”

mentioning

confidence: 93%

Photonic-Band-Gap Traveling-Wave Gyrotron Amplifier

et al. 2013

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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.

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“…Одним из способов повышения рабочей частоты является работа на i-й гармонике. Подобный подход достаточно хорошо известен и используется, в частности, в гиротронах [4][5][6]. Также известны работы, посвященные исследованию эффектов, приводящих к генерации высших гармоник в релятивистских системах с виртуальным катодом [7] и в турботроне [8], использу-ющем осцилляции турбулентного пучка между катодом и виртуальным катодом.…”

Section: Introductionunclassified