Frequency Modulation in a Submillimeter-Wave Gyrotron

Idehara, T.; Pereyaslavets, M.; Nishida, Nobuo; Yoshida, Kazufumi; Ogawa, I.

doi:10.1103/physrevlett.81.1973

Cited by 24 publications

(11 citation statements)

References 18 publications

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“…In the continuous-wave (CW) operation, temperature of the cavity increases during the operation. In the experiment it has been observed such increase of temperature influence significantly the stability of the frequency and output power of CW gyrotron [17]. Therefore, the cooling system surrounding the cavity is absolutely necessary.…”

Section: Gyrotron Design Considerationsmentioning

confidence: 99%

Detailed Consideration of Experimental Results of Gyrotron FU CW II Developed as a Radiation Source for DNP-NMR Spectroscopy

Agusu

Idehara

Ogawa

et al. 2007

Int J Infrared Milli Waves

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A CW gyrotron for the sensitivity enhancement of NMR spectroscopy through dynamic nuclear polarization has been designed. The gyrotron operates at the second harmonic and frequency of 394.6 GHz with the main operating mode TE 0,6 . Operating conditions of other neighboring cavity modes such as TE 2,6 at frequency of 392.6 GHz and TE 2,3 at frequency of 200.7 GHz were also considered. The experimental conditions of the gyrotron at low and high voltages are simulated. The output power of 56 watts corresponds to the efficiency of 2 percent at low voltage operation and frequency of 394.6 GHz is expected.

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Section: Gyrotron Design Considerationsmentioning

confidence: 99%

Detailed Consideration of Experimental Results of Gyrotron FU CW II Developed as a Radiation Source for DNP-NMR Spectroscopy

Agusu

Idehara

Ogawa

et al. 2007

Int J Infrared Milli Waves

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“…Frequency modulation is a promising alternative which deserves to be explored since it may be the only way to detect a weak XDMR signal at 354 GHz or even higher frequencies. Pioneering work done at the FIR-FU proved that the frequency of the gyrotron radiation could be modulated with an amplitude of several tens of MHz in modulating the gyrotron cavity body voltage [40,41]. Unfortunately, this option can only be implemented with gyrotrons of recent generation and cannot be performed with gyrotron FU-II.…”

Section: Xdmr In Frequency-mixing Modementioning

confidence: 97%

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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“…We are using a triode magnetron injection gun in order to control the beam parameters for modulation of amplitude and frequency [18,19]. The mirror ratio defined as B c /B g is varied from 84 to 127, where B c and B g are the magnetic field intensities at cavity region and gun region, respectively.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…Among many radiation sources, the gyrotron is one of the most appropriate ones for such a objectives, because of high efficiency even in high frequency and high harmonics [4], stability of frequency and amplitude [18,19] and possibility of long pulse or CW operation in long time.…”

Section: Introductionmentioning

confidence: 99%

Long Pulse Operation of the THz Gyrotron with a Pulse Magnet

Idehara¹,

Saito²,

Mori³

et al. 2007

Int J Infrared Milli Waves

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Long pulse operation up to 1 msec of a high frequency gyrotron with a pulse magnet has been successfully carried out in a frequency range including 1 THz. In the experiments, the timing of an electron beam pulse injection is adjusted at the top of the magnetic field pulse, where the variation of field intensity is negligible. The operation cavity modes seem to be TE 1, 12 and TE 4,12 at the second harmonics. The corresponding frequencies are 903 GHz and 1,013 GHz, respectively. Additionally several features of radiation measurement results of the gyrotron are described and brief considerations are presented.

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Frequency Modulation in a Submillimeter-Wave Gyrotron

Cited by 24 publications

References 18 publications

Detailed Consideration of Experimental Results of Gyrotron FU CW II Developed as a Radiation Source for DNP-NMR Spectroscopy

Detailed Consideration of Experimental Results of Gyrotron FU CW II Developed as a Radiation Source for DNP-NMR Spectroscopy

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

Long Pulse Operation of the THz Gyrotron with a Pulse Magnet

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