Mode conversion of a gyrotron output into a gaussian beam for its various applications

Ogawa, I.; Idehara, T.; Itakura, Y.; Ando, Hirohiko; Myodo, M.; Wágner, D.; Thumm, M.

doi:10.1109/icimw.2004.1422335

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…f yl =d,=\500 mm, f 72 =d 2 =ll54 mm. Therefore, the far-field of the image source in the y-or xdirection and that in the z-direction appear at the positions (in planes at y= -1246 mm and _y=-1754 mm) where the optical paths from the mirrors Mi and M 2 coincides with the focal lengths f yl , fa [3]. In the same manner, the mirrors M 3 and M 4 are arranged to have _/t,=c?…”

Section: Design Of the System Using Gaussian Beam Opticsmentioning

confidence: 97%

A Quasi-Optical System Converting a Gyrotron Output Radiation Into a Gaussian Beam

Ogawa¹,

Idehara²,

Sabchevski³

et al. 2001

Appc 2000

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Section: Design Of the System Using Gaussian Beam Opticsmentioning

confidence: 97%

A Quasi-Optical System Converting a Gyrotron Output Radiation Into a Gaussian Beam

Ogawa¹,

Idehara²,

Sabchevski³

et al. 2001

Appc 2000

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“…There are usually two ways for gyro-device power output, first, the high order mode is directly output from axial direction; the second, the high order mode is converted to a quasi-optical Gaussian-beam with inner-or outer-quasi-optical mode converter [6][7][8]. High order mode is not usually a linear polarized one, its propagation in an overmoded waveguide may excite many other modes because of any unhomogeneity.…”

Section: Introductionmentioning

confidence: 99%

A Mode Converter with Multi-waveguide Output from the TE01 Circular Waveguide Mode to the TE10 Rectangular Mode for Millimeter Wave Gyro-device Applications

Jiao

Luo

2007

Int J Infrared Milli Waves

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A mode converter with multi-waveguide output for millimeter wave gyro-device applications is proposed in this article, which is used to convert the TE 01 circular waveguide mode into the TE 10 rectangular waveguide mode. Computer simulations with Ansoft HFSS code show that the energy transmission coefficient of larger than 95.96% may be reached in the frequency range from 34.094 GHz to 35.8 GHz (a bandwidth of 1.706 GHz) at a VSWR of lower than 1.5 for the input operating mode.

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“…This series has demonstrated the following achievements: 1) frequency step-tunability in wide range in millimeter to submillimeter wavelength region (from 38 to 889 GHz); 2) the highest frequency (889 GHz) corresponding to the wavelength of 377μm by using second harmonic operation at the field intensity of around 17 T; 3) modulation of amplitude and frequency of the output radiation; 4) stabilization of amplitude and frequency; 5) high harmonic operations up to fifth (in a Large Orbit Gyrotron); and 6) high-purity mode operations at many cavity modes by installation of a carefully designed cavity [13]. Also, we have achieved mode conversion from circular waveguide modes to a Gaussian mode for applications of our gyrotrons to many fields [14]. Recently, the breakthrough of 1 THz in pulse operation was achieved in our Research Center [15].…”

mentioning

confidence: 95%

Design of a CW 1 THz Gyrotron (Gyrotron Fu Cw III) Using a 20 T Superconducting Magnet

Agusu

Idehara

Mori

et al. 2007

Int J Infrared Milli Waves

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Design of a CW 1 THz gyrotron at second harmonic operation using a 20 T superconducting magnet has been described. The mode competition analysis is employed to investigate operation conditions of second harmonic mode, which is being excited at the frequency ranging from 920 GHz to 1014 GHz. The output power up to 250 watt corresponding to the efficiency of 4.16 percent could be achieved by using an electron beam with accelerating voltage 30 kV and current 200 mA. The important advantage of this gyrotron is that the single mode excitation at second harmonic, and extremely high frequency of the radiation, could be maintained even at high currents. It opens possibility to realize a high power radiation source at 1 THz. Such gyrotron is under construction at FIR Center, University of Fukui.

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Mode conversion of a gyrotron output into a gaussian beam for its various applications

Cited by 3 publications

References 4 publications

A Quasi-Optical System Converting a Gyrotron Output Radiation Into a Gaussian Beam

A Quasi-Optical System Converting a Gyrotron Output Radiation Into a Gaussian Beam

A Mode Converter with Multi-waveguide Output from the TE01 Circular Waveguide Mode to the TE10 Rectangular Mode for Millimeter Wave Gyro-device Applications

Design of a CW 1 THz Gyrotron (Gyrotron Fu Cw III) Using a 20 T Superconducting Magnet

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