Review of Subterahertz and Terahertz Gyrodevices at IAP RAS and FIR FU

Bratman, V. L.; Glyavin, M. Yu.; Idehara, T.; Kalynov, Yu. K.; Лучинин, А. Г.; Мануилов, В. Н.; Mitsudo, S.; Ogawa, I.; Saito, T.; Tatematsu, Y.; Zapevalov, V. E.

doi:10.1109/tps.2008.2004787

Cited by 126 publications

(37 citation statements)

References 44 publications

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“…Compared to other high power sources such as extended interaction klystrons or TWT, gyrotrons benefit of the major advantage that the frequency is step-tunable [32,33]. From earlier work carried out at the FIR-FU center over several decades, it is well documented that proper conditions for either fundamental (s = 1) or second harmonic (s = 2) electron cyclotron resonance can be realized for several cavity modes by carefully adjusting the external magnetic field [34].…”

Section: Xdmr Using a High Power Gyrotron Sourcementioning

confidence: 99%

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

Рогалев

Goulon

Goujon

et al. 2011

J Infrared Milli Terahz Waves

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X-ray Detected Magnetic Resonance (XDMR) is a novel spectroscopy which makes use of X-ray Magnetic Circular Dichroism (XMCD) to probe the resonant precession of local magnetization components in a strong microwave pump field. In Sections 1 and 2, we briefly review the conceptual bases of XDMR and the potential interest of increasing the pumping frequency up to the THz frequency range. In Sections 3-5, we discuss the feasibility of such challenging experiments. Starting from a comparison of experiments carried out either in the transverse (TRD) or longitudinal (LOD) detection geometries, we show that XDMR measurements at sub-THz frequencies require a substantial increase in pumping power: this is where a gyrotron source looks most appropriate. It is the aim of this paper to discuss how to conduct such experiments, emphasis being laid on feasibility tests recently carried out at the ESRF using a refurbished version of Gyrotron FU-II built at the FIR-FU. In this context, we propose a new detection scheme of sub-THz XDMR spectra based on the concept of frequency-mixing in LOD geometry.

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Section: Xdmr Using a High Power Gyrotron Sourcementioning

confidence: 99%

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

Рогалев

Goulon

Goujon

et al. 2011

J Infrared Milli Terahz Waves

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show abstract

“…[6,7]. Since last one decade, huge efforts are made by researchers todevelop the sub-THz and THz gyrotrons specifically for the application of NMR (Nuclear Magnetic Resonance) spectroscopy [8,9]. The sub-THz/THz gyrotronsare used to pump tens of watt RF power at a particular frequency (decided by the proton frequency in NMR) into the NMR spectroscopic system to enhance the sensitivity of experiments via a technique called Dynamic Nuclear Polarization (DNP).…”

Section: Introductionmentioning

confidence: 99%

“…for different proton frequency NMR systems and the present development status of DNP gyrotrons isgiven in Refs. [8,9]. The main design and technological challenges for such gyrotrons are the superconducting magnet system of very high magnetic field value, frequency tunability of few GHz (generally from 2-5 GHz) and highly stable operation of the device [8,10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The main design and technological challenges for such gyrotrons are the superconducting magnet system of very high magnetic field value, frequency tunability of few GHz (generally from 2-5 GHz) and highly stable operation of the device [8,10,11]. These technological features of DNP gyrotrons make the design and development of the device slightly different from high power fusion gyrotrons [2,6,8,9]. 30-50 watt RF power at 132 GHz frequency is required for dynamic nuclear polarization in 200 MHz NMR spectrometer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Triode Magnetron Injection Gun for 132 GHZ Gyrotron for 200 MHZ DNP-NMR Application

Kumar¹,

Singh²,

Sinha³

2013

PIER C

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Abstract-A 132 GHz gyrotron, operating at fundamental harmonic, is designed for the 200 MHz DNP-NMR experiment. In this article, the design of high quality electron beam source is presented. 2.5 dimensional code EGUN and 3 dimensional code CST-Particle Studio are used in the design and optimization of electron gun. The design of electron beam source is performed for a band of magnetic field values at the emitter surface and cavity center which is necessary for the frequency tunabilty of 2-3 GHz needed in DNP/NMR experiments. The results confirm the axial and transverse velocity spreads around 1% and 2.2% and a pitch factor of 1.5. The parametric analyses are also performed for the various electrical parameters such as emitter voltage, anode voltage, emitter magnetic field, etc..

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“…That is why existing FELs can be only used in specialized research centers. In comparison with the FELs, subterahertz and terahertz gyrotrons are capable of generating the same or even a higher level of average power using a significantly lower electron energy of tens of keV (see, for instance, a review [4]). At the same time, terahertz gyrotrons require very strong magnetic fields.…”

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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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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Review of Subterahertz and Terahertz Gyrodevices at IAP RAS and FIR FU

Cited by 126 publications

References 44 publications

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

X-Ray Detected Magnetic Resonance at Sub-THz Frequencies Using a High Power Gyrotron Source

Triode Magnetron Injection Gun for 132 GHZ Gyrotron for 200 MHZ DNP-NMR Application

Terahertz Gyrotrons at IAP RAS: Status and New Designs

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