Large-Orbit Gyrotron Operation in the Terahertz Frequency Range

Bratman, V. L.; Kalynov, Yu. K.; Мануилов, В. Н.

doi:10.1103/physrevlett.102.245101

Cited by 272 publications

(82 citation statements)

References 10 publications

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“…In order to enhance the selectivity of high harmonic excitation, the configuration of Large Orbit Gyrotron (LOG) with near-monoaxial (axis-encircling) electron beams are also employed [18,19]. Such beams can, in particular, be formed in guns with a cusp (reversal) of the magnetic field near the cathode [16,20].…”

Section: Basic Relations and Gyrotron Designmentioning

confidence: 99%

“…Now a number of institutions including IAP developed fairly low-power CW gyrotrons with frequencies 0.14-0.46 THz for high-field Electron Spin Resonance (ESR) spectroscopy and Dynamic Nuclear Polarization (DNP) in Nuclear Magnetic Resonance (NMR) spectroscopy [10][11][12][13]. Recently, pulsed gyrotrons operated at the fundamental [14], second [15], and third [16] cyclotron harmonics overcame an important technological and psychological frontier of 1 THz. As a result, clear prospects for the realization of powerful gyrotrons with the maximum radiation frequencies at least 1-1.5 THz both in pulsed and CW regimes have been opened.…”

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confidence: 99%

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Terahertz Gyrotrons at IAP RAS: Status and New Designs

Bratman

Glyavin

Kalynov

et al. 2010

J Infrared Milli Terahz Waves

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Powerful gyrotrons with radiation frequencies in the range 0.33-0.65 THz were demonstrated at the IAP as early as in the 1970-1980s. This trend has recently been renewed in connection with a significant increase in interest in terahertz frequency range. In the course of new experiments, the radiation frequency of pulsed gyrotrons was increased up to 1.3 THz and 1 THz at the fundamental and third cyclotron harmonics, respectively. In addition, gyrotrons operated in CW regime with a frequency of 0.3 THz for technological applications (in collaboration with the University of Fukui, Japan) and 0.26 THz for the dynamic nuclear polarization at a high-field NMR were implemented. Designs of a pulsed fundamental-harmonic gyrotron with MW-level power at 0.3 THz and a CW kW-level third-harmonic gyrotron with a frequency of 0.4 THz are currently developed. Estimates show that modern techniques for the creation of strong magnetic fields now make it possible to realize gyrotrons with an operating frequency at least up to 1-1.5 THz. Such generators utilize a relatively low particle energy and can provide higher average power than the existing FELs.

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Section: Basic Relations and Gyrotron Designmentioning

confidence: 99%

mentioning

confidence: 99%

Terahertz Gyrotrons at IAP RAS: Status and New Designs

Bratman

Glyavin

Kalynov

et al. 2010

J Infrared Milli Terahz Waves

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“…При заданном токе инжекции это позволяет обеспечить условия самовозбуждения при относительно низкой дифракционной добротности рабочего резонатора, что ведет к существенному снижению доли омических потерь. В последние годы достигнут существенный прогресс в создании гиротронов субтерагерцового и терагерцового диапазонов [1][2][3][4][5][6]. При работе на основной гармонике гирочастоты в традиционной схеме цилиндрического гиротрона [1-4], а также при работе на гармониках гирочастоты в так называемом гиротроне с большой орбитой [5,6] полу-чено терагерцовое излучение с мощностью несколько киловатт.…”

Section: поступило в редакцию 29 марта 2016 гunclassified

“…В последние годы достигнут существенный прогресс в создании гиротронов субтерагерцового и терагерцового диапазонов [1][2][3][4][5][6]. При работе на основной гармонике гирочастоты в традиционной схеме цилиндрического гиротрона [1-4], а также при работе на гармониках гирочастоты в так называемом гиротроне с большой орбитой [5,6] полу-чено терагерцовое излучение с мощностью несколько киловатт. Вместе с тем развитие коротковолновых гиротронов сталкивается с рядом существенных проблем, среди которых можно отметить формирование сильных магнитных полей с напряженностью в 20−40 T, формирование пучков с приемлемым разбросом параметров, а также необходимость снижения доли омических потерь, которые приводят к существенному падению выходного КПД и мощности излучения.…”

Section: поступило в редакцию 29 марта 2016 гunclassified

Оптимизация Условий Самовозбуждения Терагерцовых Гиротронов На Основе Увеличения Времени Жизни Циклотронных Осцилляторов В Рабочем Пространстве С Пониженным Напряжением

Ginzburg¹,

Глявин²,

Зотова³

et al. 2017

Письма В Журнал Технической Физики

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Предложен метод снижения стартовых и рабочих токов коротковолновых гиротронов путем приложения тормозящего потенциала непосредственно к рабочему резонатору. Указанный эффект достигается за счет увеличения времени жизни электронов в рабочем пространстве. При заданном токе инжекции это позволяет обеспечить условия самовозбуждения при относительно низкой дифракционной добротности рабочего резонатора, что ведет к существенному снижению доли омических потерь. DOI: 10.21883/PJTF.2017.02.44187.16273

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“…Several successful terahertz range large orbit harmonic gyrotrons experiments have been carried out at resonant magnetic fields 10.5 -14 T [16,17]. The 3D PIC code MAGIC was used to simulate and optimize the design of the cusp electron beam source.…”

Section: Cusp Electron Gunmentioning

confidence: 99%

Design and simulation of a ∼390 GHz seventh harmonic gyrotron using a large orbit electron beam

Li¹,

He²,

Cross³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. A~390 GHz harmonic gyrotron based on a cusp electron gun has been designed and numerically modelled. The gyrotron operates at the 7 th harmonic of the electron cyclotron frequency with the beam interacting with a TE 71 waveguide mode. Theoretical as well as numerical simulation results using the 3D Particle-In-Cell (PIC) code MAGIC are presented. The cusp gun generated an axis-encircling, annular shaped electron beam of energy 40 keV, current 1.5 A with a velocity ratio of 3. Smooth cylindrical waveguides have been studied as the interaction cavities and their cavity Q optimized for 390 GHz operation. In the simulations 600 W of output power at the design frequency has been demonstrated. [5,6]. The gyrotron is well known as a coherent millimeter wave source capable of high power and high frequency output which is extendable to the Terahertz (THz) frequency region. Recently a gyrotron achieved kilowatts of output power operated at the fundamental electron cyclotron frequency of 1 THz [7] by using a pulsed solenoid. However, continuous wave (CW) operation at such a frequency is a formidable task because of the large magnetic field (~40 T) that is required. As the output frequency increases, both larger magnetic fields and reduced interaction region size are needed when operating at the fundamental cyclotron frequency. An alternative approach to generate CW high frequency radiation is to work at higher cyclotron harmonics [8,9,10,11] which allow the use of larger cavity sizes and smaller magnetic fields by a factor of s, where s is the harmonic number. A CW high harmonic gyrotron operating at a frequency of~390 GHz at relatively lower B-field was designed and is presented in this paper. In this gyrotron cyclotron resonance takes place between the seventh harmonic of the electron cyclotron frequency (s = 7) and the TE 71 waveguide mode. A large orbit electron beam from a cusp gun is used to reduce the possibility of parasitic interactions. The small-signal theory of the beam-wave interaction was used to calculate the growth rate and the starting current. A smooth-bore cavity was designed with a suitable Q value by optimizing the angle of the output taper and the length of the cavity so that the starting current requirement is met. Finally, the beam-wave interaction of the gyrotron was simulated using the 3D Particle-In-Cell (PIC) code MAGIC and the results are presented. Keywords: Harmonic gyrotron, terahertz, large orbit electron beam

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Large-Orbit Gyrotron Operation in the Terahertz Frequency Range

Cited by 272 publications

References 10 publications

Terahertz Gyrotrons at IAP RAS: Status and New Designs

Terahertz Gyrotrons at IAP RAS: Status and New Designs

Design and simulation of a ∼390 GHz seventh harmonic gyrotron using a large orbit electron beam

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