Gyrotron Development for High Power THz Technologies at IAP RAS

Bratman, V. L.; Богдашов, А. А.; Денисов, Г. Г.; Glyavin, M. Yu.; Kalynov, Yu. K.; Лучинин, А. Г.; Мануилов, В. Н.; Zapevalov, V. E.; Zavolsky, N. A.; Zorin, V. G.

doi:10.1007/s10762-012-9898-6

Cited by 42 publications

(9 citation statements)

References 25 publications

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“…Gyrotrons have historically been developed mainly for plasma heating in fusion tokamak reactors [8][9][10][11][12][13]. The required microwave power for this application is however in the megawatt range and the frequency requirements are below those for the DNP-NMR application [14,15].…”

Section: Introductionmentioning

confidence: 99%

Second Harmonic 527-GHz Gyrotron for DNP-NMR: Design and Experimental Results

Jawla

Griffin

Mastovsky

et al. 2020

IEEE Trans. Electron Devices

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We report the design and experimental demonstration of a frequency tunable terahertz gyrotron at 527 GHz built for an 800 MHz Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance (DNP-NMR) spectrometer. The gyrotron is designed at the second harmonic (ω = 2ω c ) of the electron cyclotron frequency. It produces up to 9.3 W continuous microwave (CW) power at 527.2 GHz frequency using a diode type electron gun operating at V = 16.65 kV, I b = 110 mA in a TE 11,2,1 mode, corresponding to an efficiency of ~0.5%. The gyrotron is tunable within ~ 0.4 GHz by combining voltage and magnetic field tuning. The gyrotron has an internal mode converter that produces a Gaussian-like beam that couples to the HE 11 mode of an internal 12 mm i.d. corrugated waveguide periscope assembly leading up to the output window. An external corrugated waveguide transmission line system is built including a corrugated taper from 12 mm to 16 mm i.d. waveguide followed by 3 m of the 16 mm i.d. waveguide The microwave beam profile is measured using a pyroelectric camera showing ~ 84% HE 11 mode content.

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Section: Introductionmentioning

confidence: 99%

Second Harmonic 527-GHz Gyrotron for DNP-NMR: Design and Experimental Results

Jawla

Griffin

Mastovsky

et al. 2020

IEEE Trans. Electron Devices

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“…®ÑÜÐÑÇ ÕÇÓÂÅÇÓÙÇÄÑÇ ËÊÎÖÚÇÐËÇ ÏÑÉÇÕ ÃÞÕß ËÔÒÑÎßÊÑÄÂÐÑ AEÎâ ÔÑÊAEÂÐËâ ÒÎÑÕ-ÐÑÌ ÒÎÂÊÏÞ Ë ÖÒÓÂÄÎÇÐËâ ÇÈ ÒÂÓÂÏÇÕÓÂÏË (ÖÒÓÂÄÎâÇÏÞÌ ÕÇÓÏÑâAEÇÓÐÞÌ ÔËÐÕÇÊ, "ÕÑÚÇÚÐÞÇ" ÒÎÂÊÏÇÐÐÞÇ ËÔÕÑÚ-ÐËÍË ÓÇÐÕÅÇÐÑÄÔÍÑÅÑ ËÊÎÖÚÇÐËâ, AEËÔÕÂÐÙËÑÐÐÑÇ ÑÃÐÂÓÖ-ÉÇÐËÇ ËÔÕÑÚÐËÍÑÄ ËÑÐËÊËÓÖáÜÇÅÑ ËÊÎÖÚÇÐËâ) [2], Â ÕÂÍÉÇ AEÎâ ÓâAEÂ ÕÇØÐÑÎÑÅËÚÇÔÍËØ Ë ÏÇAEËÙËÐÔÍËØ ÒÓËÎÑÉÇÐËÌ (ÔÏ., ÐÂÒÓËÏÇÓ, [3]). ³ÑÊAEÂÐËÇ ÏÑÜÐÞØ ËÔÕÑÚÐËÍÑÄ ËÊ-ÎÖÚÇÐËâ Ä àÕÑÏ AEËÂÒÂÊÑÐÇ ÔÄâÊÂÐÑ Ô ÒÓËÐÙËÒËÂÎßÐÞÏË ×ËÊËÚÇÔÍËÏË ÑÅÓÂÐËÚÇÐËâÏË: ÕÓÂAEËÙËÑÐÐÞÇ àÎÇÍÕÓÑÄÂ-ÍÖÖÏÐÞÇ ÒÓËÃÑÓÞ (ÍÎËÔÕÓÑÐÞ, ÎÂÏÒÞ ÑÃÓÂÕÐÑÌ ËÎË ÃÇÅÖÜÇÌ ÄÑÎÐÞ) ÔÑAEÇÓÉÂÕ àÎÇÏÇÐÕÞ Ô ÓÂÊÏÇÓÂÏË, ÃÎËÊ-ÍËÏË Í AEÎËÐÇ ÄÑÎÐÞ, ÚÕÑ ÒÓËÄÑAEËÕ Í ÒÇÓÇÅÓÇÄÖ ËÎË ÒÓÑÃÑá ÒÓË ÄÞÔÑÍÑÏ ÖÓÑÄÐÇ ÏÑÜÐÑÔÕË, Â ÎÂÊÇÓÞ Ä ÖÍÂÊÂÐÐÑÏ AEËÂÒÂÊÑÐÇ ËÏÇáÕ ÐËÊÍÖá à××ÇÍÕËÄÐÑÔÕß.…”

Section: £äçAeçðëḉunclassified

High power terahertz sources for spectroscopy and material diagnostics

Glyavin¹,

Денисов²,

Zapevalov³

et al. 2016

Usp. Fiz. Nauk

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“…Free electron lasers and synchrotron radiation have a high degree of tunability and are capable of delivering high peak-power coherent terahertz pulses [22]. Gyrotrons, based on the principle of electron cyclotron radiation, are able to generate wattto-megawatt-level terahertz continuous wave radiation [11] at low terahertz frequencies (0.3-1.3 THz) [5,4]. These devices, however, have limited accessibility to the larger scientific community, and can be difficult to synchronize to laser sources with high (fs) precision.…”

Section: Introductionmentioning

confidence: 99%

Full 3D + 1 modeling of tilted-pulse-front setups for single-cycle terahertz generation

Wang¹,

Kroh²,

Matlis³

et al. 2020

J. Opt. Soc. Am. B

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The tilted-pulse-front setup utilizing a diffraction grating is one of the most successful methods to generate single-to few-cycle terahertz pulses. However, the generated terahertz pulses have a large spatial inhomogeneity, due to the noncollinear phase matching condition and the asymmetry of the prism-shaped nonlinear crystal geometry, especially when pushing for high optical-to-terahertz conversion efficiency. A 3D+1 (x,y,z,t) numerical model is necessary in order to fully investigate the terahertz generation problem in the tilted-pulse-front scheme. We compare in detail the differences between 1D+1, 2D+1 and 3D+1 models. The simulations show that the size of the optical beam in the pulse-front-tilt plane sensitively affects the spatio-temporal properties of the terahertz electric field. The terahertz electric field is found to have a strong spatial dependence such that a few-cycle pulse is only generated near the apex of the prism. The part of the beam farther from the apex contains a large fraction of the energy but has a waveform that deviates from a few-cycle. This strong spatial dependence must be accounted for when using the terahertz pulses for strong-field physics and carrier-envelope-phase sensitive experiments such as terahertz acceleration, coherent control of antiferromagnetic spin waves and terahertz high-harmonic generation. arXiv:1908.09581v1 [physics.optics]

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Gyrotron Development for High Power THz Technologies at IAP RAS

Cited by 42 publications

References 25 publications

Second Harmonic 527-GHz Gyrotron for DNP-NMR: Design and Experimental Results

Second Harmonic 527-GHz Gyrotron for DNP-NMR: Design and Experimental Results

High power terahertz sources for spectroscopy and material diagnostics

Full 3D + 1 modeling of tilted-pulse-front setups for single-cycle terahertz generation

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